Doctor of Science, The University of Tokyo

Master of Science, The University of Tokyo

Social Transformation

argency

Backcasting

Education for climate change

Development Education

総合的な探究の時間

Biogeochemical Cycles

Elderly welfare

Tourism

生物多様性

大気光学現象

海洋生態系

数値シミュレーション

CSR

ESD

環境教育

持続可能な開発

SDGs

IR

Atmospheric Science

Higher Education

Practical Science for the Environment

Ocean Science

climate change

Environmental Science/Agriculture Science, Environmental dynamic analysis

Humanities & Social Sciences, Tertiary education

Natural Science, Atmospheric and hydrospheric sciences

Humanities & Social Sciences, Science education

Environmental Science/Agriculture Science, Environmental policy and social systems

Humanities & Social Sciences, Educational technology

Energy Engineering, Earth resource engineering, Energy sciences

Humanities & Social Sciences, Area studies

Life Science, Ecology and environment

Humanities & Social Sciences, Gender studies

Humanities & Social Sciences, Tourism studies

Master's degree program, Graduate School of Environmental Science

Doctoral (PhD) degree program, Graduate School of Environmental Science

Beyond-Group-Chats as a Platform for Online Ethnic Communities
Chenyang Xia; Yasuhiro Yamanaka
Journal of Chinese Overseas, 22, 1, 149, 173, 05 Mar. 2026, [Peer-reviewed], [Last author]
English, Scientific journal

Photoacclimation contributes to Arctic primary production under sea ice and around the subsurface chlorophyll maximum
Yoshio Masuda; Maki Noguchi Aita; Sherwood Lan Smith; Amane Fujiwara; Eiji Watanabe; Hiroshi Sumata; Hideyuki Nakano; Yasuhiro Yamanaka
Communications Earth & Environment, 7, 158, 12 Jan. 2026, [Peer-reviewed], [Last author]
English, Scientific journal

Traditional Wisdom for Modern Sustainability: A Dish-Level Analysis of Japanese Home Cooking in NHK Today’s Cooking
Rui Fu; Yasuhiro Yamanaka
Nutrients, 17, 16, 2712, 21 Aug. 2025, [Peer-reviewed], [Last author]
Scientific journal

Possibility to Grasp the Older Drivers’ Conditions from the Triennial Nationwide Survey of Japan for Elderly Welfare
Mengmeng He; Yasuhiro Yamanaka; Kazuya Takamatsu
International Journal of Environmental Research and Public Health, 24 Dec. 2024, [Peer-reviewed], [Last author]
English, Scientific journal

How might the spread of online meal-delivery services impact achievement of the SDGs?
Rui Fu; Gregory Trencher; Yasuhiro Yamanaka
Discover Sustainability, 5, 1, Springer Science and Business Media LLC, 05 Nov. 2024, [Peer-reviewed], [Last author]
English, Scientific journal

A case study on the influence of educational support on the future career paths of female students : A case study of the Japan Yunnan Friendship Association's project
Ning Wang; Yasuhiro Yamanaka
Journal of agricultural development studies, 34, 2, 37, 44, 藤沢 : 日本国際地域開発学会, Dec. 2023, [Peer-reviewed], [Last author]
Japanese

Acclimation by diverse phytoplankton species determines oceanic carbon to nitrogen ratios
Yoshio Masuda; Yasuhiro Yamanaka; Sherwood Lan Smith; Takafumi Hirata; Hideyuki Nakano; Akira Oka; Hiroshi Sumata; Maki Noguchi Aita
Limnology and Oceanography Letters, 8, 3, 385, 537, Wiley, 14 Jan. 2023, [Peer-reviewed]
English, Scientific journal

The impact of non-financial support in child sponsorship programs : a study on perspectives of high school girls in a Chinese ethnic minority region
Ning WANG; Yasuhiro Yamanaka
Journal of agricultural development studies, 33, 1, 30, 40, Jun. 2022, [Peer-reviewed], [Last author]
English, Scientific journal

Risk Factors Causing Mountaineering Accidents and Information Communication Measures for Mountain Climbing Safety in Asahidake, Daisetsuzan National Park
方 翀博; 山中 康裕
Geographical Studies, 96, 2, 19, 31, Dec. 2021, [Peer-reviewed], [Last author]
Japanese, Scientific journal

Photoacclimation by phytoplankton determines the distribution of global subsurface chlorophyll maxima in the ocean
Yoshio Masuda; Yasuhiro Yamanaka; Sherwood Lan Smith; Takafumi Hirata; Hideyuki Nakano; Akira Oka; Hiroshi Sumata
Communications Earth & Environment, 2, 1, Dec. 2021, [Peer-reviewed]
English, Scientific journal

Extracting Persons in Need of Evacuation Support Based on Information on Daily Life during the Disaster: Case Study of Initial Responses by Tsurui Village, Hokkaido, to the Hokkaido Eastern Iburi Earthquake
TAKAMATSU Kazuya; Yasuhiro YAMANAKA
The Japanese Journal of Regional Policy Studies, 26, 26, 74, 82, The Japan Association of Regional Policy, Mar. 2021, [Peer-reviewed], [Last author]
Japanese, “List of Persons in Need of Evacuation Support” is prepared based on the requirements for anticipated disasters, based on the regional disaster prevention plan, and its use during regular times is also encouraged. When an unexpected disaster occurs, these requirements may not be sufficient to deal with the situation. In such cases, municipalities must establish new requirements and find those who are applicable during a disaster. This study focused on the initial response of the Health and Welfare Division in Tsurui Village, Hokkaido, in the event of a large-scale blackout right after the Hokkaido Eastern Iburi Earthquake occurred on September 6, 2018, and discussed the perspectives necessary for the list to be used in times of disaster, as well as the advantages and challenges of using the information on daily life. The results show that a list of people with information on daily life can also be used in an emergency to extract people according to new requirements and situations.

Arrival briefings as an effective interpretation strategy in tourist destinations: The case of Daisetsuzan National Park, Japan
Chongbo Fang; Yasuhiro Yamanaka; Gregory Trencher
Journal of Outdoor Recreation and Tourism, 33, 100363, 100363, Mar. 2021, [Peer-reviewed]
English, Scientific journal

Photoacoustic Experimental System to Measure Infrared Absorption－Estimation of the Energy Budget by Two Gas Cells in Tandem－
FUKUHARA Akiko; YAMANAKA Yasuhiro; KANEKO Fumitoshi
Journal of JSEE, 69, 2, 2_32, 2_37, Japanese Society for Engineering Education, 2021, [Peer-reviewed]
Japanese, When a modulated light is absorbed by a material, a sound with the same frequency as the modulation is generated by the material. This phenomenon, which is called the photoacoustic effect, is a convenient way to study the infrared absorption of gases. Several studies have been conducted to employ it as an educational tool to support students’ understanding of the greenhouse effect and global warming. To enhance educational effectiveness, we have made the following two attempts; one is using two serially aligned sample cells, and the other is an experiment employing microscope cover glasses. The former helps students analyze the experimental data more quantitatively, and the latter helps them learn the concept of optical thickness in meteorology.

Suppression of activity of the Long-tailed Tit by low air temperature in the winter of central Hokkaido, northern Japan
Masahiro Hasegawa; Yasuhiro Yamanaka
Strix : journal of field ornithology, 37, 1, 8, 東京 : 日本野鳥の会自然保護室, 2021, [Peer-reviewed], [Last author]
Japanese

Scientists prefer research answering humanity's intellectual curiosity: questionnaire results from Members of the Japan Geoscience Union
Yasuhiro Yamanaka; Michiyo Shimamura; Kiyoshi Suyehiro; Brooks Hanson
Proceedings - 2021 10th International Congress on Advanced Applied Informatics, IIAI-AAI 2021, 237, 242, 2021, [Peer-reviewed], [Lead author, Corresponding author]
English, International conference proceedings

Geoscientists' Perceptions of Research and its Evaluation: Questionnaire Survey Results from the Members of American Geophysical Union
Michiyo Shimamura; Yasuhiro Yamanaka; Brooks Hanson; Kiyoshi Suyehiro
Proceedings - 2021 10th International Congress on Advanced Applied Informatics, IIAI-AAI 2021, 255, 260, 2021, [Peer-reviewed]
English, International conference proceedings

An empirical analysis of the driving status for elderly people using the survey for “Insured Long-Term Care Service Plans” - A case study using “Performance of a survey of needs in spheres of daily life” -
Mengmeng He; Kazuya Takamatsu; Kunihiro Kishi; Yasuhiro Yamanaka
Journal of the City Planning Institute of Japan, 55, 3, 631, 636, The City Planning Institute of Japan, 25 Oct. 2020, [Peer-reviewed], [Last author]
Japanese, Scientific journal, Japan is facing an ageing society with a declining birthrate, and the number of elderly people who are forced to drive is gradually increasing in rural areas with limited public transport resources. Every three years, Japanese local governments perform “ the survey of needs in spheres of daily life” as a survey for the daily life and functional health of elderly people (above 65 years old) when developing “Insured Long-Term Care Service Plans.” This study suggests that this survey could provide information about the current situations of driving by elderly people. One is, using logistic regression analysis, we would screen elderly people who are driving but should not drive guessed by their functional health status, named “watched drivers”. Another is, we would identify the following sequence of driving status with declining functional health states: 1) only driving on their own, 2) driving on their own with riding in a car by others (as potential “watched drivers”), 3) only riding in a car by others, and 4) not driving nor riding.

Inhibition of competitive exclusion due to phytoplankton dispersion: a contribution for solving Hutchinson's paradox
Yoshio Masuda; Yasuhiro Yamanaka; Takafumi Hirata; Hideyuki Nakano; Takashi S. Kohyama
Ecological Modelling, 430, 109089, 109089, Aug. 2020, [Peer-reviewed]
English, Scientific journal

Improvement of Three Days Course with Student Surveys using Google® Forms - A Case Study of 'Introduction to Environmental Science' in Hokkaido University
Yasuhiro Yamanaka; Kaede Shoji
Proceedings - 2019 8th International Congress on Advanced Applied Informatics, IIAI-AAI 2019, 434, 437, Jul. 2019, [Peer-reviewed], [Lead author]
English, International conference proceedings

The Role of Mentors to Develop Graduate Students' Transferable Skills
Michiyo Shimamura; Toru Hagiwara; Yasuhiro Yamanaka
2019 8th International Congress on Advanced Applied Informatics (IIAI-AAI), 426, 429, IEEE, Jul. 2019, [Peer-reviewed]
English, International conference proceedings

The potential value of research-based evidence in destination management: The case of Kamikawa, Japan
Yukari Higuchi; Yasuhiro Yamanka
Tourism Review, 74, 2, 166, 177, Apr. 2019, [Peer-reviewed], [Last author]
English, Scientific journal

Understanding Nature through Photography: An Empirical Analysis of the Intents of Nature Photographers and the Preparatory Process
Naoyuki Ohara; Yasuhiro Yamanaka; Gregory Trencher
Environmental Communication, 13, 8, 1053, 1058, Feb. 2019, [Peer-reviewed]
English, Scientific journal

How universities provide education relevant to interdisci-plinary studies? – Environmental studies courses in re-search university as IR survey using education support system
Yasuhiro Yamanaka; Shota Mitsui; Michiyo Shimamura
International Journal of Institutional Research and Management International Institute of Applied Informatics, 2, 1, 受理, Jan. 2019, [Peer-reviewed], [Lead author]
English, Scientific journal

A lesson plan for development education designed by a Chinese graduate student: Practices at two elementary schools in Shimukappu, Hokkaido
Ying Liu; Kai Takahashi; Yasuhiro Yamanaka
Development Education, 65, 121, 129, Dec. 2018, [Peer-reviewed], [Last author, Corresponding author]
Japanese, Scientific journal

Ocean currents and herbivory drive macroalgae-to-coral community shift under climate warming
Naoki H. Kumagai; Jorge García Molinos; Hiroya Yamano; Shintaro Takao; Masahiko Fujii; Yasuhiro Yamanaka
Proceedings of the National Academy of Sciences of the United States of America, 115, 36, 8990, 8995, Sep. 2018, [Peer-reviewed], [Last author]
English, Scientific journal

タンクモデルを参考にした小学校高学年向けの地下水学習の教材開発
岩井尚人; 山中康裕; 根岸淳二郎; 山田朋人
水利科学, 364, 5, 59, 80, Aug. 2018, [Peer-reviewed]
Japanese, Scientific journal, 地下水の持続可能な利用は，その保全にとって必要である。地下水を保全す る態度を育むために，小学校教育の中で地下水について学ぶ機会を作ることは，重要なことである。本研究では，小学校高学年生が地下水涵養に関する森 林の機能などの地下水に関する基本的知識を学べる教材を，タンクモデルを参 考にして開発した。教材は，3 段タンクで構成され，森林領域の下にある帯水 層に設置したスポンジが水を貯留し，その水は装置外へゆっくりと流出するよ うになっている。教材で表現したのは，森林は主要な地下水の涵養域であるこ と，地下水は地表水に比べて滞留時間が長いことの 2 つである。教材を用いた 散水実験では，3 段のタンクそれぞれからの流出ピークのタイムラグや滞留時 間の違いなど，上記 2 点を定量的に確認した。小学校等の教員13名を対象に実 施した教材の実演と，彼らに対する聞き取り調査では，多くの教員は，小学校 児童にとって，上記 2 点が分かりやすいと判断した。

What is the Most Suitable Transferable Skill Test for the Graduate School Students in Research University in Japan?
Michiyo Shimamura; Yukinori Kobayashi; Yasuhiro Yamanaka
Proceedings - 2018 7th International Congress on Advanced Applied Informatics, IIAI-AAI 2018, 408, 413, 02 Jul. 2018, [Peer-reviewed], [Last author]
English, International conference proceedings

Biological data assimilation for parameter estimation of a phytoplankton functional type model for the western North Pacific
Yasuhiro Hoshiba; Takafumi Hirata; Masahito Shigemitsu; Hideyuki Nakano; Taketo Hashioka; Yoshio Masuda; Yasuhiro Yamanaka
Ocean Science, 14, 3, 371, 386, 01 Jun. 2018, [Peer-reviewed], [Last author]
English, Scientific journal

Evaluating core competencies development in sustainability and environmental master's programs: An empirical analysis
Gregory Trencher; Shirley Vincent; Kyle Bahr; Shogo Kudo; Kate Markham; Yasuhiro Yamanaka
Journal of Cleaner Production, 181, 829, 841, 20 Apr. 2018, [Peer-reviewed], [Last author]
English, Scientific journal

Establishing the Brand-New Trans-Graduate Education Frame: Challenges of Hokkaido University “Nitobe School Program"
YAMANAKA Yasuhiro; SHIMAMURA Michiyo
International Journal of Institutional Research and Management International Institute of Applied Informatics, 1, 2, 37, 53, Mar. 2018, [Peer-reviewed], [Lead author]
English, Scientific journal

15 years and still living: The basel pilot region laboratory and switzerland’s pursuit of a 2,000-watt society
Gregory Trencher; Achim Geissler; Yasuhiro Yamanaka
Urban Living Labs: Experimenting with City Futures, 167, 188, Jan. 2018, [Peer-reviewed], [Last author]
English, Research society

Long-term response of oceanic carbon uptake to global warming via physical and biological pumps
Yamamoto, Akitomo; Abe-Ouchi, Ayako; Yamanaka, Yasuhiro
Biogeosciences, 15, 13, 4163, 4180, 2018, [Peer-reviewed], [Last author]
English, Scientific journal

A framework to analyze skier's behavior with GPS in a snow resort
Yoshimura Nobuhiko; Yamanaka Yasuhiro; Tanaka Daisuke; Kanbayashi Norio
Theory and Applications of GIS, 25, 2, 101, 111, Geographic Information Systems Association, 31 Dec. 2017, [Peer-reviewed]
Japanese, Understanding the skier's behavior (including snowboarders and other equipment users) in a snow area contributes not only to efficient management of safety and facilities but also improving services. However, a snow area manager only knows the number of skiers who use the lifts or gondolas in general. We proposed a framework to analyze skier's behavior with GPS in snow resorts, which consists of two standpoints such as inter- and inner-ski slopes. We clarified both a transition of skier's choice in relation to ski slopes, lifts/gondolas and rest places (inter-ski slopes), and a movement of skiers in each ski slope (inner-ski slope). We found that the characteristics of skier and ski slope had more variety than the technical levels: beginners', intermediate, and advanced. Even if ski slopes had the same level, they had different characteristics from each other. The framework contributes to understanding the detail of skier's behavior and improving services.

IR Survey Using Education Support System in Research University
Shota Mitsui; Michiyo Shimamura; Yasuhiro Yamanaka
Proceedings - 2017 6th IIAI International Congress on Advanced Applied Informatics, IIAI-AAI 2017, 142, 146, 15 Nov. 2017, [Peer-reviewed], [Last author, Corresponding author]
English, International conference proceedings

What is the Most Suitable English Test for the Graduate School Students in Research University in Japan?
Michiyo Shimamura; Yasuhiro Yamanaka
Proceedings - 2017 6th IIAI International Congress on Advanced Applied Informatics, IIAI-AAI 2017, 153, 157, 15 Nov. 2017, [Peer-reviewed]
English, International conference proceedings

Utilization of the Student E-Portfolio in the Graduate Education: The Case Report of 'Nitobe School Program' in Hokkaido University
Shotaro Imai; Michiyo Shimamura; Ankit A. Ravankar; Hisashi Haga; Yukinori Kobayashi; Yasuhiro Yamanaka
Proceedings - 2017 6th IIAI International Congress on Advanced Applied Informatics, IIAI-AAI 2017, 147, 152, 15 Nov. 2017, [Peer-reviewed], [Last author]
English, International conference proceedings

Effect of instructor’s actions and attitudes on student’s motivation and discussion process in TBL class for graduate students
Shotaro Imai; Ankit Ravankar; Michiyo Shimamura; Taichi Takasuka; Go Chiba; Yasuhiro Yamanaka
International Journal of Institutional Research and Management, 1, 2, 17, 35, Sep. 2017, [Peer-reviewed], [Last author]
English, Scientific journal

Biological data assimilation for parameter estimation of a phytoplankton functional type model for the western North Pacific
Yasuhiro Hoshiba; Takafumi Hirata; Masahito Shigemitsu; Hideyuki Nakano; Taketo Hashioka; Yoshio Masuda; Yasuhiro Yamanaka
Ocean Science Discussions, 1, Copernicus {GmbH}, 29 May 2017, [Last author]

A Comprehensive Course Introducing Environmental Science : Case Study of “Introduction to Environmental Science” as a Common Course in the Graduate School of Environmental Science
Yasuhiro Yamanaka; Shota Mitsui
高等教育ジャーナル : 高等教育と生涯学習, 24, 117, 130, 北海道大学高等教育推進機構, Mar. 2017, [Peer-reviewed]
Japanese

One possible uncertainty in CMIP5 projections of low-oxygen water volume in the Eastern Tropical Pacific
Shigemitsu, M.; Yamamoto, A.; Oka, A.; Yamanaka, Y.
Global Biogeochemical Cycles, 31, 5, 2017, [Peer-reviewed], [Last author]
Scientific journal

Knowledge sharing between academic researchers and tourism practitioners: a Japanese study of the practical value of embeddedness, trust and co-creation
Yukari Higuchi; Yasuhiro Yamanaka
JOURNAL OF SUSTAINABLE TOURISM, 25, 10, 1456, 1473, 2017, [Peer-reviewed], [Last author]
English, Scientific journal

Competition and community assemblage dynamics within a phytoplankton functional group: Simulation using an eddy-resolving model to disentangle deterministic and random effects
Yoshio Masuda; Yasuhiro Yamanaka; Takafumi Hirata; Hideyuki Nakano
ECOLOGICAL MODELLING, 343, 1, 14, Jan. 2017, [Peer-reviewed]
English, Scientific journal

A Study on the Transformation Process of Community from Migrant Workers in a Resort to Development Actors in the Rural Area
SATO Shiho; SHIKIDA Asami; YAMANAKA Yasuyiro
JOURNAL OF RURAL PLANNING ASSOCIATION, 35, 3, 414, 423, THE ASSOCIATION OF RURAL PLANNING, Dec. 2016, [Peer-reviewed], [Last author]
Japanese, This paper investigates the effect of migrant workers' experiences in workplace and local community on their consciousness and relationship to the local area. Based on interviews to migrants worked in a resort in Shimukappu, Hokkaido, we studied the process that they were transformed into community development actors. A migrant workers' community formed through use of local resources helped them to settle in local community and to transform them into actors. Developing relationships with local residents from the use of local resources contributed to form migrant workers' positive senses to local area. That is, resort's activities using local resources could give rural area chances of getting new actors.

Habitat-forming seaweeds in Japan (fucoids and temperate kelps)
Naoki H. Kumagai; Hiroya Yamano; Masahiko Fujii; Yasuhiro Yamanaka
ECOLOGICAL RESEARCH, 31, 6, 759, 759, Nov. 2016, [Peer-reviewed], [Last author]
English, Scientific journal

Simulation of the effects of bottom topography on net primary production induced by riverine input
Yasuhiro Hoshiba; Yasuhiro Yamanaka
CONTINENTAL SHELF RESEARCH, 117, 20, 29, Apr. 2016, [Peer-reviewed], [Last author]
English, Scientific journal

Potential use of the N-2/Ar ratio as a constraint on the oceanic fixed nitrogen loss
M. Shigemitsu; N. Gruber; A. Oka; Y. Yamanaka
GLOBAL BIOGEOCHEMICAL CYCLES, 30, 4, 576, 594, Apr. 2016, [Peer-reviewed], [Last author]
English, Scientific journal

海洋生態系モデル（Marine Ecosystem Model:MEM）の概要
重光雅仁; 山中康裕
月刊海洋, 548, 281, 290, 2016, [Last author]
Japanese, Symposium

Potential future coral habitats around Japan depend strongly on anthropogenic CO2 emissions
Yara, Y; H. Yamano; M. Steinacher; M. Fujii; M. Vogt; N. Gruber; Y. Yamanaka
Aquatic Biodiversity Conservation and Ecosystem Services, 41, 56, 2016, [Peer-reviewed], [Last author]
English, Scientific journal

Nurturing Problem-Finding Skills in Graduate Students through Problem Based Learning Approaches
Ankit A. Ravankar; Shotaro Imai; Michiyo Shimamura; Go Chiba; Taichi Takasuka; Yasuhiro Yamanaka
PROCEEDINGS 2016 5TH IIAI INTERNATIONAL CONGRESS ON ADVANCED APPLIED INFORMATICS IIAI-AAI 2016, 542, 546, 2016, [Peer-reviewed], [Last author]
English, International conference proceedings

How does the English ability of the student change through the postgraduate education? similar to The case report of "Nitobe School Program" in Hokkaido University"similar to
Michiyo Shimamura; Shotaro Imai; Ankit A. Ravankar; Yasuhiro Yamanaka
PROCEEDINGS 2016 5TH IIAI INTERNATIONAL CONGRESS ON ADVANCED APPLIED INFORMATICS IIAI-AAI 2016, 547, 551, 2016, [Peer-reviewed], [Last author]
English, International conference proceedings

Discussion on a method of Team-Based-Learning style lecture for graduate students in a research university
Shotaro Imai; Ankit A. Ravankar; Michiyo Shimamura; Taichi E. Takasuka; Go Chiba; Yasuhiro Yamanaka
PROCEEDINGS 2016 5TH IIAI INTERNATIONAL CONGRESS ON ADVANCED APPLIED INFORMATICS IIAI-AAI 2016, 537, 541, 2016, [Peer-reviewed], [Last author]
English, International conference proceedings

A trans-graduate-school education program awaking competencies to graduate students in Research University The concept of Nitobe School program in Hokkaido University
Yasuhiro Yamanaka; Michiyo Shimamura
PROCEEDINGS 2016 5TH IIAI INTERNATIONAL CONGRESS ON ADVANCED APPLIED INFORMATICS IIAI-AAI 2016, 533, 536, 2016, [Peer-reviewed], [Lead author]
English, International conference proceedings

Effect of seasonal change in gas transfer coefficient on air-sea CO2 flux in the western North Pacific
Xuanrui Xiong; Yoshio Masuda; Taketo Hashioka; Tsuneo Ono; Yasuhiro Yamanaka
JOURNAL OF OCEANOGRAPHY, 71, 6, 685, 701, Dec. 2015, [Peer-reviewed], [Last author]
English, Scientific journal

An improved estimation of the poleward expansion of coral habitats based on the inter-annual variation of sea surface temperatures
S. Takao; H. Yamano; K. Sugihara; N. H. Kumagai; M. Fujii; Y. Yamanaka
CORAL REEFS, 34, 4, 1125, 1137, Dec. 2015, [Peer-reviewed], [Last author]
English, Scientific journal

Adaptation pathways of global wheat production: Importance of strategic adaptation to climate change
Akemi Tanaka; Kiyoshi Takahashi; Yuji Masutomi; Naota Hanasaki; Yasuaki Hijioka; Hideo Shiogama; Yasuhiro Yamanaka
SCIENTIFIC REPORTS, 5, Sep. 2015, [Peer-reviewed], [Last author]
English, Scientific journal

Projecting the impacts of rising seawater temperatures on the distribution of seaweeds around Japan under multiple climate change scenarios
Shintaro Takao; Naoki H. Kumagai; Hiroya Yamano; Masahiko Fujii; Yasuhiro Yamanaka
ECOLOGY AND EVOLUTION, 5, 1, 213, 223, Jan. 2015, [Peer-reviewed], [Last author]
English, Scientific journal

Global deep ocean oxygenation by enhanced ventilation in the Southern Ocean under long-term global warming
Yamamoto, A.; Abe-Ouchi, A.; Shigemitsu, M.; Oka, A.; Takahashi, K.; Ohgaito, R.; Yamanaka, Y.
Global Biogeochemical Cycles, 29, 10, 1801, 1815, 2015, [Peer-reviewed], [Last author]
Scientific journal

How should Assessment of the graduate educational outcomes? Case study from the requirements of research and educational funding project in Japan
Michiyo Shimamura; Yasuhiro Yamanaka
2015 IIAI 4TH INTERNATIONAL CONGRESS ON ADVANCED APPLIED INFORMATICS (IIAI-AAI), 455, 457, 2015, [Peer-reviewed]
English, International conference proceedings

高等教育機関におけるIR人材およびIR人材育成の在り方 : 総合研究大学における経験から得られた知見(教職開発研究会,課題研究,教育情報と人材育成～未来を育む子供たちのために～)
島村 道代; 山中 康裕
年会論文集, 31, 186, 187, 日本教育情報学会, 2015, [Peer-reviewed]
Japanese, 近年,高等教育におけるIR (Institutional Research)の重要性・必要性が高まっている。このため各大学ではIR組織の設置が進んでいるが,機関によって求められる貢献や方向性が多様であると言える。そこで本発表では,特に求められる業務タイプを念頭に,IR人材の在り方およびIR人材育成の在り方について,教職開発の観点から提言させて頂き議論を行いたい。

Spatial and temporal dynamics of coastal sea surface temperature and catches of Japanese scallop Mizuhopecten yessoensis in Hokkaido
柴野良太; 藤井賢彦; 山中康裕; 山野博哉; 髙尾信太郎
Bulletin of the Japanese Society of Fisheries Oceanography, 78, 4, 259, 267, 水産海洋学会, Nov. 2014, [Peer-reviewed], [Last author]
Japanese

Natural coast management by divers actors for conservation and recreational use of Ishikari coast, Hokkaido
MATSUSHIMA Hajime; TAKEDA Shota; YAMANAKA Yasuhiro
Landscape Research Japan, 78, 2, 95, 96, Jul. 2014, [Invited], [Last author]
Japanese, Scientific journal

Projected coral bleaching in response to future sea surface temperature rises and the uncertainties among climate models
Yumiko Yara; Masahiko Fujii; Hiroya Yamano; Yasuhiro Yamanaka
HYDROBIOLOGIA, 733, 1, 19, 29, Jul. 2014, [Peer-reviewed], [Last author]
English, Scientific journal

Newly Constructed Relationship Between a Resort Company and Local Farmers for the Creative Local Resource Use in the Rural Area : A Case Study of Collaboration of Hoshino Resort Tomamu and Farmers in Shimukappu, Hokkaido
佐藤 志穂; 山中 康裕; 敷田 麻実
日本地域政策研究, 12, 12, 9, 17, 日本地域政策学会, Mar. 2014, [Peer-reviewed]
Japanese, Scientific journal, Collaboration with exogenous actor is an important factor for the community development through tourism. For creative resourceuse, it is also crucial to construct of prosperous coexistence relationship between exogenous and local actors . We report a case ofcollaboration of exogenous resort with local farmers for local resource uses in Shimukappu, Hokkaido. Through focusing changes inthe consciousness and series of stakeholder s action of the resort in the collaboration process, we examined construction ofrelationship between exogenous actors and farmers. The stakeholders of the resort endeavored to develop one-on-one relationshipwith farmers, to construct sustainable and mutualistic relationships with farmers. The results of this study indicate that exogenousactor has potential contributing to local endogenous development.

Sensitivity of cool summer-induced sterility of rice to increased growing-season temperatures: A case study in Hokkaido, Japan
Akemi Tanaka; Tomonori Sato; Manabu Nemoto; Yasuhiro Yamanaka
JOURNAL OF AGRICULTURAL METEOROLOGY, 70, 1, 25, 40, 2014, [Peer-reviewed], [Last author]
English, Scientific journal

Ocean oxygen depletion due to decomposition of submarine methane hydrate
Yamamoto, A.; Yamanaka, Y.; Oka, A.; Abe-Ouchi, A.
Geophysical Research Letters, 41, 14, 5075, 5083, 2014, [Peer-reviewed]
English, Scientific journal

Fe/Al ratios of suspended particulate matter from intermediate water in the Okhotsk Sea: Implications for long-distance lateral transport of particulate Fe
Masahito Shigemitsu; J. Nishioka; Y. W. Watanabe; Y. Yamanaka; T. Nakatsuka; Y. N. Volkov
MARINE CHEMISTRY, 157, 41, 48, Dec. 2013, [Peer-reviewed]
English, Scientific journal

Along-coast shifts of plankton blooms driven by riverine inputs of nutrients and fresh water onto the coastal shelf: a model simulation
Yasuhiro Hoshiba; Yasuhiro Yamanaka
JOURNAL OF OCEANOGRAPHY, 69, 6, 753, 767, Dec. 2013, [Peer-reviewed], [Last author]
English, Scientific journal

The distribution, dominance patterns and ecological niches of plankton functional types in Dynamic Green Ocean Models and satellite estimates
M. Vogt; T. Hashioka; M. R. Payne; E. T. Buitenhuis; C. Le Quéré; S. Alvain; M. N. Aita; L. Bopp; S. C. Doney; T. Hirata; I. Lima; S. Sailley; Y. Yamanaka
Copernicus GmbH, 04 Nov. 2013
Abstract. We compare the spatial and temporal representation of phytoplankton functional types (pPFTs) in four different Dynamic Green Ocean Models (DGOMs; CCSM-BEC, NEMURO, PISCES and PlankTOM5) to derived phytoplankton distributions from two independent satellite estimates, with a particular focus on diatom distributions. Global annual mean surface biomass estimates for diatoms vary between 0.23 mmol C m−3 and 0.77 mmol C m−3 in the models, and are comparable to a satellite-derived estimate (0.41 mmol C m−3). All models consistently simulate a higher zonal mean diatom biomass contribution in the high latitudes than in the low latitudes, but the relative diatom contribution varies substantially between models with largest differences in the high latitudes (20% to 100% of total biomass). We investigate phytoplankton distribution in terms of annual and monthly mean dominance patterns, i.e. the distribution of locations where a given PFT contributes more than 50% to total biomass. In all models, diatoms tend to dominate large areas of the high latitudes of both hemispheres, and the area of the surface ocean dominated by diatoms is significantly higher in the models than in the satellite estimates. We estimate the realized ecological niches filled by the dominant pPFT at each location as a function of annual mean surface nitrate concentration (NO3), sea surface temperature (SST), and mixed layer depth. A general additive model (GAM) is used to map the probability of dominance of all pPFTs in niche and geographic space. Models tend to simulate diatom dominance over a wider temperature and nutrient range, whereas satellites confine diatom dominance to a narrower niche of low-intermediate annual mean temperatures (annual mean SST < 10 °C), but allow for niches in different ranges of surface NO3 concentrations. For annual mean diatom dominance, the statistically modelled probability of dominance explains the majority of the variance in the data (65.2–66.6%). For the satellite estimates, the explained deviance is much lower (44.6% and 32.7%). The differences in the representation of diatoms among models and compared to satellite estimates highlights the need to better resolve phytoplankton succession and phenology in the models. This work is part of the marine ecosystem inter-comparison project (MAREMIP).

Projected impacts of climate change on marine fish and fisheries
Anne B. Hollowed; Manuel Barange; Richard J. Beamish; Keith Brander; Kevern Cochrane; Kenneth Drinkwater; Michael G. G. Foreman; Jonathan A. Hare; Jason Holt; Shin-ichi Ito; Suam Kim; Jacquelynne R. King; Harald Loeng; Brian R. MacKenzie; Franz J. Mueter; Thomas A. Okey; Myron A. Peck; Vladimir I. Radchenko; Jake C. Rice; Michael J. Schirripa; Akihiko Yatsu; Yasuhiro Yamanaka
ICES JOURNAL OF MARINE SCIENCE, 70, 5, 1023, 1037, Sep. 2013, [Peer-reviewed]
English, Scientific journal

Climate forcing and the Kuroshio/Oyashio ecosystem
Akihiko Yatsu; Sanae Chiba; Yasuhiro Yamanaka; Shin-ichi Ito; Yugo Shimizu; Masahide Kaeriyama; Yoshioro Watanabe
ICES JOURNAL OF MARINE SCIENCE, 70, 5, 922, 933, Sep. 2013, [Peer-reviewed]
English, Scientific journal

Comparing food web structures and dynamics across a suite of global marine ecosystem models
S. F. Sailley; M. Vogt; S. C. Doney; M. N. Aita; L. Bopp; E. T. Buitenhuis; T. Hashioka; I. Lima; C. Le Quere; Y. Yamanaka
ECOLOGICAL MODELLING, 261, 43, 57, Jul. 2013, [Peer-reviewed]
English, Scientific journal

Optimization of the horizontal shape of CO2 injected domain and the depths of release in moving-ship type CO2 ocean sequestration
Yoshio Masuda; Yasuhiro Yamanaka; Yoshikazu Sasai
JOURNAL OF MARINE SCIENCE AND TECHNOLOGY, 18, 2, 220, 228, Jun. 2013, [Peer-reviewed]
English, Scientific journal

Unionoid mussels as an indicator of fish communities: A conceptual framework and empirical evidence
J. N. Negishi; S. Nagayama; M. Kume; S. Sagawa; Y. Kayaba; Y. Yamanaka
ECOLOGICAL INDICATORS, 24, 127, 137, Jan. 2013, [Peer-reviewed], [Last author]
English, Scientific journal

Phytoplankton competition during the spring bloom in four plankton functional type models
T. Hashioka; M. Vogt; Y. Yamanaka; C. Le Quere; E. T. Buitenhuis; M. N. Aita; S. Alvain; L. Bopp; T. Hirata; I. Lima; S. Sailley; S. C. Doney
BIOGEOSCIENCES, 10, 11, 6833, 6850, 2013, [Peer-reviewed]
English, Scientific journal

A comparison between phytoplankton community structures derived from a global 3D ecosystem model and satellite observation
Takafumi Hirata; Stephane Saux-Picart; Taketo Hashioka; Maki Aita-Noguchi; Hiroshi Sumata; Masahito Shigemitsu; J. Icarus Allen; Yasuhiro Yamanaka
Journal of Marine Systems, 109-110, 129, 137, Jan. 2013, [Peer-reviewed], [Last author]
English, Scientific journal

Impacts of climate change on growth, migration and recruitment success of Japanese sardine (Sardinops melanostictus) in the western North Pacific
Takeshi Okunishi; Shin-ichi Ito; Taketo Hashioka; Takashi T. Sakamoto; Naoki Yoshie; Hiroshi Sumata; Yumiko Yara; Naosuke Okada; Yasuhiro Yamanaka
Climatic Change, 115, 3-4, 485, 503, Nov. 2012, [Peer-reviewed], [Last author]
English, Scientific journal

Influence of Atmospheric Disturbances on the Lower Trophic Level Ecosystem in the Japan Sea
ONITSUKA GO; ONITSUKA GO; YANAGI TETSUO; UNO ITSUSHI; KAWAMURA HIDEYUKI; YOON JONG-HWAN; YAMANAKA YASUHIRO
沿岸海洋研究, 50, 1, 45-51, 51, Coastal Oceanography Research Committee, the Oceanographic Society of Japan, Aug. 2012, [Peer-reviewed], [Last author]
Japanese, The influences of atmospheric disturbances on the lower trophic level ecosystem in the Japan Sea were investigated using a nitrogen-based coupled physical-ecosystem model. The differences in primary production were compared among several cases forced by the sea-surface fluxes with various temporal resolutions. The primary production was higher in the case forced by the wind stress with higher temporal resolution during spring to fall. The vertical mixing with intermittent strong winds increased nutrient concentration from the surface to subsurface layer, resulting in enhancement of primary production in the stratified season when the limiting factor of photosynthesis was nutrient. The influence of atmospheric nitrogen deposition, as well as short-term forcing, needs to be also considered for the simulation of surface biogeochemical processes in the East Asian marginal seas including the Japan Sea.

"Oasis in the Field of Snow and Ice" Using the Technique of the Ice Shell
YAMAGISHI Natsuko; TANAKA Daisuke; SATO Daisuke; NAKAMURA Kazuki; YAMANAKA Yasuhiro; SATO Shiho
日本雪工学会誌 : journal of snow engineering, 28, 3, 231, 234, Jul. 2012, [Peer-reviewed]
Japanese, Scientific journal

Development of a one-dimensional ecosystem model including the iron cycle applied to the Oyashio region, western subarctic Pacific
M. Shigemitsu; T. Okunishi; J. Nishioka; H. Sumata; T. Hashioka; M. N. Aita; S. L. Smith; N. Yoshie; N. Okada; Y. Yamanaka
Journal of Geophysical Research: Oceans, 117, 6, 2012, [Peer-reviewed], [Last author]
English, Scientific journal

Assessment and Improvement of the Global Agro-Ecological Zones Model for Estimation of Rice Productivity in Hokkaido
Akemi TANAKA; Kiyoshi TAKAHASHI; Yonghee SHIN; Yuji MASUTOMI; Yasuhiro YAMANAKA; Tomonori SATO
Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research), 68, 5, I{\_}237, I_248, Japan Society of Civil Engineers, 2012, [Peer-reviewed]
Japanese, We assessed possibility of the Global Agro-Ecological Zones (GAEZ) model for applying to rice productivity in Hokkaido, Japan, and improved it in order to simulate rice yield change responding to climate in Hokkaido. Before improving GAEZ model, the simulated yield was almost zero in most of the calculated periods, which means, the original GAEZ model is not applicable to Hokkaido where strengthening cool tolerance of rice variety has been developed. We improved four points: (1) easing temperature requirement, (2) modifying biomass calculation, (3) predicting heading date and (4) predicting cool summer damage due to floral impotency. The improvement of (1) enables GAEZ model to apply for cold regions; but, it did not simulate the observed yield variation. A simulation with combination of (1), (2), (3) and (4) simulated the variation of observed data. Especially, taking account of cool summer damage due to floral impotency and predicting heading date contribute to more accurate simulation of the observed yield variation.

Ocean acidification limits temperature-induced poleward expansion of coral habitats around Japan
Y. Yara; M. Vogt; M. Fujii; H. Yamano; C. Hauri; M. Steinacher; N. Gruber; Y. Yamanaka
BIOGEOSCIENCES, 9, 12, 4955, 4968, 2012, [Peer-reviewed], [Last author]
English, Scientific journal

Impact of rapid sea-ice reduction in the Arctic Ocean on the rate of ocean acidification
A. Yamamoto; M. Kawamiya; A. Ishida; Y. Yamanaka; S. Watanabe
BIOGEOSCIENCES, 9, 6, 2365, 2375, 2012, [Peer-reviewed]
English, Scientific journal

A modeling approach to evaluate growth and movement for recruitment success of Japanese sardine (Sardinops melanostictus) in the western Pacific
Takeshi Okunishi; Shin-Ichi Ito; Daisuke Ambe; Akinori Takasuka; Takahiko Kameda; Kazuaki Tadokoro; Takashi Setou; Kosei Komatsu; Atsushi Kawabata; Hiroshi Kubota; Tadafumi Ichikawa; Hiroya Sugisaki; Taketo Hashioka; Yasuhiro Yamanaka; Naoki Yoshie; Tomowo Watanabe
FISHERIES OCEANOGRAPHY, 21, 1, 44, 57, 2012, [Peer-reviewed]
English, Scientific journal

Responses of marine ecosystem to typhoon passages in the western subtropical North Pacific
Ryota Shibano; Yasuhiro Yamanaka; Naosuke Okada; Takashi Chuda; Shin-ichi Suzuki; Hiroshi Niino; Mitsuhiro Toratani
GEOPHYSICAL RESEARCH LETTERS, 38, 18, Sep. 2011, [Peer-reviewed]
English, Scientific journal

Marine Environmental Simulation for Future Projection of Marine Ecosystems
YAMANAKA Yasuhiro
Journal of the Japan Society for Computational Engineering and Science, 16, 3, 2590, 2593, 日本計算工学会, Jul. 2011, [Peer-reviewed]
Japanese, コレクション : 国立国会図書館デジタルコレクション > デジタル化資料 > 雑誌

Ocean biogeochemical research with an ecosystem model(Review in series "Frontiers in Geochemistry")
SHIGEMATSU Masahito; YAMANAKA Yasuhiro
Chikyukagaku, 45, 1, 1, 28, 日本地球化学会, Mar. 2011, [Peer-reviewed], [Last author]
Japanese, The importance of an ecosystem model as a tool to analyse ocean biogeochemical data has recently been increasing. That is because an ecosystem model can be used as a tool (1) to test hypotheses to explain observational data at hand, (2) to combine the generally scarce ocean observations into a more coherent picture and (3) to indirectly obtain some information about immeasurable process by a data-assimilative approach. In this review, we first show the basic model equations to construct a relatively simple ecosystem model. Then, we introduce some researches which use the above usefulness of...

Development of a method for estimating changes in snow quality in Hokkaido due to climate change
中村一樹; 佐藤友徳; 山中康裕; 西村浩一
寒地技術シンポジウム論文集, 27, 80, 85, 2011
Symposium

Projection and uncertainty of the poleward range expansion of coral habitats in response to sea surface temperature warming: A multiple climate model study
Yara, Y; K. Oshima; M. Fujii; H. Yamano; Y. Yamanaka; N. Okada
Galaxea, 13, 1, 11, 20, 日本サンゴ礁学会, 2011, [Peer-reviewed]
English, Scientific journal, Using projected monthly mean sea surface tem-perature (SST) in the 21st century obtained by multiple climate models and SST-based indices for the poleward range expansions of three types of coral habitats, we quantitatively evaluated the effects of SST warming on potential northern limit of coral habitats in seas close to Japan and their uncertainty in the global warming pro-jections. The uncertainty in the timing of temperate coral community formation due to global warming was no less than 30 years, with a modulation of ±10 years due to decadal climate variability. Tropical-subtropical and tem-perate coral communities and coral occurrence in seas close to Japan were predicted to shift poleward by a few hundred kilometers by the end of the 21st century. The average estimated speeds of the shifts were 1, 2, and 4 km/year for the tropical-subtropical coral community, temper-ate coral community, and coral occurrence, respectively. The simulated speeds were relatively slower than those previously observed (up to 14 km/year; Yamano et al. 2011), indicating that there are time lags between the new recruitment of coral colonies and the establishment of coral communities. Hence, monitoring of coral dynamics in response to SST warming is required. Collaboration between monitoring and modeling would enhance the reliability of future projections of changes in coral ha-bitats. Such projections are important for conserving marine biodiversity and developing plans for human societies to adapt to global warming.

Synoptic relationships between surface Chlorophyll-a and diagnostic pigments specific to phytoplankton functional types
T. Hirata; N. J. Hardman-Mountford; R. J. W. Brewin; J. Aiken; R. Barlow; K. Suzuki; T. Isada; E. Howell; T. Hashioka; M. Noguchi-Aita; Y. Yamanaka
BIOGEOSCIENCES, 8, 2, 311, 327, 2011, [Peer-reviewed], [Last author]
English, Scientific journal

Effect of eddy transport on the nutrient supply into the euphotic zone simulated in an eddy-permitting ocean ecosystem model
Hiroshi Sumata; Taketo Hashioka; Tatsuo Suzuki; Naoki Yoshie; Takeshi Okunishi; Maki N. Aita; Takashi T. Sakamoto; Akio Ishida; Naosuke Okada; Yasuhiro Yamanaka
JOURNAL OF MARINE SYSTEMS, 83, 1-2, 67, 87, Oct. 2010, [Peer-reviewed], [Last author]
English, Scientific journal

Relationship between Sinking Organic Matter and Minerals in the Shallow Zone of the Western Subarctic Pacific
Masahito Shigemitsu; Yutaka W. Watanabe; Yasuhiro Yamanaka; Hajime Kawakami; Makio C. Honda
JOURNAL OF OCEANOGRAPHY, 66, 5, 697, 708, Oct. 2010, [Peer-reviewed]
English, Scientific journal

Effects of physical changes in the ocean on the atmospheric pCO(2): glacial-interglacial cycles
Takasumi Kurahashi-Nakamura; Ayako Abe-Ouchi; Yasuhiro Yamanaka
CLIMATE DYNAMICS, 35, 4, 713, 719, Sep. 2010, [Peer-reviewed]
English, Scientific journal

Ocean ecosystem responses to future global change scenarios: A way forward
Shin-ichi Ito; Kenneth A. Rose; Arthur J. Miller; Ken Drinkwater; Keith Brander; James E. Overland; Svein Sundby; Enrique Curchitser; James W. Hurrell; Yasuhiro Yamanaka
Marine Ecosystems and Global Change, 287, 322, Oxford University Press, 01 May 2010, [Peer-reviewed], [Last author]
English, In book

Seasonal characteristics of the nitrogen isotope biogeochemistry of settling particles in the western subarctic Pacific: A model study
Masahito Shigemitsu; Yasuhiro Yamanaka; Yutaka W. Watanabe; Nobuhiro Maeda; Shinichiro Noriki
EARTH AND PLANETARY SCIENCE LETTERS, 293, 1-2, 180, 190, Apr. 2010, [Peer-reviewed]
English, Scientific journal

Physiological acclimation by phytoplankton explains observed changes in Si and N uptake rates during the SERIES iron-enrichment experiment
S. Lan Smith; Naoki Yoshie; Yasuhiro Yamanaka
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS, 57, 3, 394, 408, Mar. 2010, [Peer-reviewed], [Last author]
English, Scientific journal

Using altimetry to help explain patchy changes in hydrographic carbon measurements (vol 114, C09013, 2009)
Keith B. Rodgers; Robert M. Key; Anand Gnanadesikan; Jorge L. Sarmiento; Olivier Aumont; Laurent Bopp; Scott C. Doney; John P. Dunne; David M. Glover; Akio Ishida; Masao Ishii; Andrew R. Jacobson; Claire Lo Monaco; Ernst Maier-Reimer; Herle Mercier; Nicolas Metzl; Fiz F. Perez; Aida F. Rios; Rik Wanninkhof; Patrick Wetzel; Christopher D. Winn; Yasuhiro Yamanaka
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 114, 12, Dec. 2009, [Peer-reviewed]
English, Scientific journal

Projected effects of global warming on coral reefs in seas close to Japan
YARA Yumiko; FUJII Masahiko; YAMANAKA Yasuhiro; OKADA Naosuke; YAMANO Hiroya; OSHIMA Kazuhiro
Journal of the Japanese Coral Reef Society, 11, 0, 131, 140, The Japanese Coral Reef Society, Dec. 2009
Japanese, Global warming and associated increases in water temperature is considered to be a crucial factor for future corals, by inducing coral habitat migration toward higher latitudes and intensifying chances for coral bleaching and death. Using projected monthly-mean sea surface temperature in the 21^st century, we quantitatively evaluate the potential effects of global warming on corals in seas close to Japan. Our result shows that the temperature-determined northern limit of subtropical coral reefs, which is currently located in the southern Kyushu, is expected to migrate northward, up to the northern Kyushu, and that the northern limit of coral habitat, currently located in Niigata and Chiba Prefectures, is estimated to go up to Aomori and Iwate Prefectures, by the end of the 21^st century. In the Ryukyu Islands, on the other hand, both frequency and area of coral bleaching or death are expected to be intensified. Particularly, intermittently experienced high water temperatures which result in bleaching or death of present-day corals, will appear perpetually in the latter half of the 21^st century.

Study on vertical profiles of rare earth elements by using an ocean general circulation model
Akira Oka; Hiroyasu Hasumi; Hajime Obata; Toshitaka Gamo; Yasuhiro Yamanaka
GLOBAL BIOGEOCHEMICAL CYCLES, 23, GB4025, Nov. 2009, [Peer-reviewed], [Last author]
English, Scientific journal

Potential impact of global warming on North Pacific spring blooms projected by an eddy-permitting 3-D ocean ecosystem model
Taketo Hashioka; Takashi T. Sakamoto; Yasuhiro Yamanaka
GEOPHYSICAL RESEARCH LETTERS, 36, 20, L20604, Oct. 2009, [Peer-reviewed]
English, Scientific journal

Numerical simulation of atmospheric and oceanic biogeochemical cycles to an episodic CO2 release event: Implications for the cause of mid-Cretaceous Ocean Anoxic Event-1a
Kazuhiro Misumi; Yasuhiro Yamanaka; Eiichi Tajika
EARTH AND PLANETARY SCIENCE LETTERS, 286, 1-2, 316, 323, Aug. 2009, [Peer-reviewed]
English, Scientific journal

Modeling of methane bubbles released from large sea-floor area: Condition required for methane emission to the atmosphere
A. Yamamoto; Y. Yamanaka; E. Taiika
EARTH AND PLANETARY SCIENCE LETTERS, 284, 3-4, 590, 598, Jul. 2009, [Peer-reviewed]
English, Scientific journal

Optimal uptake kinetics: physiological acclimation explains the pattern of nitrate uptake by phytoplankton in the ocean
S. Lan Smith; Yasuhiro Yamanaka; Markus Pahlow; Andreas Oschlies
MARINE ECOLOGY PROGRESS SERIES, 384, 1, 12, May 2009, [Peer-reviewed]
English, Scientific journal

Influence of export rain ratio changes on atmospheric CO2 and sedimentary calcite preservation
Megumi O. Chikamoto; Katsumi Matsumoto; Yasuhiro Yamanaka
JOURNAL OF OCEANOGRAPHY, 65, 2, 209, 221, Apr. 2009, [Peer-reviewed], [Last author]
English, Scientific journal

Influences of physical processes on the ecosystem of Jakarta Bay: a coupled physical-ecosystem model experiment
Alan F. Koropitan; Motoyoshi Ikeda; Ario Damar; Yasuhiro Yamanaka
ICES JOURNAL OF MARINE SCIENCE, 66, 2, 336, 348, Mar. 2009, [Peer-reviewed], [Last author]
English, Scientific journal

A simulation model for Japanese sardine (Sardinops melanostictus) migrations in the western North Pacific
Takeshi Okunishi; Yasuhiro Yamanaka; Shin-ichi Ito
ECOLOGICAL MODELLING, 220, 4, 462, 479, Feb. 2009, [Peer-reviewed]
English, Scientific journal

Analysis of mechanisms controlling the seasonal variations in d13C of settling particles in the western subarctic Pacific
Shigemitsu Masahito; Yamanaka Yasuhiro; Watanabe W. Yutaka; Okada Naosuke; Nobuhiro Maeda; Noriki Sinichiro
Abstracts of Annual Meeting of the Geochemical Society of Japan, 56, 337, 337, GEOCHEMICAL SOCIETY OF JAPAN, 2009
We collected settling particles by time-series sediment trap deployed at station KNOT (44°N 155°E, trap depth 770m) from 25 October 1999 to 20 June 2001, and from 25 June 2002 to 11 May 2006, and measured particulate organic carbon content and its carbon isotopic ratio (δ13C-POC) for each sample. δ13C-POC generally showed the trend that minima occur in spring, and maxima occur in fall. The range of the values was from about -27.0 to -23.0⁰/₀₀. To interpret the mechanisms controlling such variations quantitatively, we developed a one-dimensional ecosystem model including carbon isotopes. In our model, we considered the isotope effects by photosynthesis, degradation of particulate organic carbon, precipitation of calcite and gas exchange. This model successfully reproduced the seasonal variations in dissolved inorganic carbon (DIC) concentration, δ13C of DIC in the surface water, and δ13C-POC. We analyzed the mechanisms controlling δ13C-POC in our model results.

Using altimetry to help explain patchy changes in hydrographic carbon measurements
Keith B. Rodgers; Robert M. Key; Anand Gnanadesikan; Jorge L. Sarmiento; Olivier Aumont; Laurent Bopp; Scott C. Doney; John R Dunne; David M. Glover; Akio Ishida; Masao Ishii; Andrew R. Jacobson; Claire Lo Monaco; Ernst Maier-Reimer; Herlé Mercier; Nicolas Metzl; Fiz F. Pérez; Aida F. Rios; Rik Wanninkhof; Patrick Wetzel; Christopher D. Winn; Yasuhiro Yamanaka
Journal of Geophysical Research: Oceans, 114, 9, 2009, [Peer-reviewed]
English, Scientific journal

The role of ocean transport in the uptake of anthropogenic CO2
L. Cao; M. Eby; A. Ridgwell; K. Caldeira; D. Archer; A. Ishida; F. Joos; K. Matsumoto; U. Mikolajewicz; A. Mouchet; J. C. Orr; G. -K. Plattner; R. Schlitzer; K. Tokos; I. Totterdell; T. Tschumi; Y. Yamanaka; A. Yool
BIOGEOSCIENCES, 6, 3, 375, 390, 2009, [Peer-reviewed]
English, Scientific journal

Site selection in CO2 ocean sequestration: Dependence of CO2 injection rate on eddy activity distribution
Yoshio Masuda; Yasuhiro Yamanaka; Yoshikazu Sasai; Michimasa Magi; Takashi Ohsumi
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, 3, 1, 67, 76, Jan. 2009, [Peer-reviewed]
English, Scientific journal

Development and analysis of a coral cover database in seas close to Japan
NAKAO Yushin; YAMANO Hiroya; FUJII Masahiko; YAMANAKA Yasuhiro
Journal of the Japanese Coral Reef Society, 11, 1, 109, 129, The Japanese Coral Reef Society, 2009
Although various monitoring studies have conducted for corals in seas close to Japan since 1970’s, the outputs were compiled in different formats, and therefore, intercomparison of the results was extremely difficult. In this study, we collected numerous bulletin reports and monitoring data on coral cover (percentage of corals relative to whole substrate), developed a database in a unified format, and analyzed the database. Our study suggests that time series of coral cover is substantially different among oceanic regions close to Japan. Further analyses of controlling factors on coral cover such as the water temperature and counter-pest density using the database are anticipated to allow us to evaluate more quantitatively the influence of the stress factors on coral cover in each oceanic region.

Ocean anoxic events in the mid-Cretaceous simulated by a 3-D biogeochemical general circulation model
Kazuhiro Misumi; Yasuhiro Yamanaka
CRETACEOUS RESEARCH, 29, 5-6, 893, 900, Oct. 2008, [Peer-reviewed], [Last author]
English, Scientific journal

Geographical distribution of the feedback between future climate change and the carbon cycle
Chisato Yoshikawa; Michio Kawamiya; Tomomichi Kato; Yasuhiro Yamanaka; Taroh Matsuno
Journal of Geophysical Research: Biogeosciences, 113, 3, G03002, Blackwell Publishing Ltd, 28 Sep. 2008, [Peer-reviewed]
English, Scientific journal

Geographical distribution of the feedback between future climate change and the carbon cycle
Yoshikawa Chisato; Kawamiya Michio; Kato Tomomichi; Yamanaka Yasuhiro; Matsuno Taroh
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 113, G3, 04 Jul. 2008, [Peer-reviewed]
English, Scientific journal

Glacial-interglacial cycles of the atmospheric pCO(2): Effects of physical change in the ocean
Takasumi Kurahashi-Nakamura; Ayako Abe-Ouchi; Yasuhiro Yamanaka
GEOCHIMICA ET COSMOCHIMICA ACTA, 72, 12, A505, A505, Jul. 2008, [Peer-reviewed], [Last author]
English

Simulation of 50 Mton CO_2 injection per year into the ocean using OGCM
MASUDA Yoshio; YAMANAKA Yasuhiro; SASAI Yoshikazu; FUJII Masahiko
Journal of Advanced Marine Science and Technology Society, 14, 1, 81, 87, 海洋理工学会, Jul. 2008, [Peer-reviewed]
Japanese, To evaluate whether chronic impacts on biota are caused by 50 Mton CO2 injection per year into the ocean, we simulated transport and dilution of injected CO2 using an offline oceanic general circulation model (OGCM) with a horizontal resolution of 0.1 by 0.1 degrees. Carbon dioxide is continuously injected for 30 years into a site with 1 degree in longitude and 3 degrees in latitude. Most of the CO2 dissolved water is transported in the longitudinal direction. In addition, inter-spatial correlation of the CO2 concentration is relatively higher in the longitudinal direction than in the latitudinal direction. Therefore, a site with large latitudinal width is effective to decrease C02 concentration in order to reduce/avoid biological impacts. CO2 concentration increases first several to 10 years, but shows signs of levelling off after the initial increase. As the simulated maximum CO2 concentration is 80 % of the ” predicted no effect concentration” (PNEC) which is an index to estimate concentration causing no effects on biota, we conclude that 50 Mton CO2 injection per year causes no chronic impacts.

O(2) consumption rate and its isotopic fractionation factor in the deep water of the Philippine Sea
Noriko Nakayama; Yasuhiro Yamanaka; Toshitaka Gamo
JOURNAL OF OCEANOGRAPHY, 64, 3, 451, 457, Jun. 2008, [Peer-reviewed]
English, Scientific journal

Analyses of the seasonal variations in d15N of settling particles in the western subarctic Pacific using an ecosystem model including nitrogen isotopes
Shigemitsu Masahito; Yamanaka Yasuhiro; Watanabe Yutaka; Maeda Nobuhiro; Noriki Shinichiro
Abstracts of Annual Meeting of the Geochemical Society of Japan, 55, 309, 309, GEOCHEMICAL SOCIETY OF JAPAN, 2008
Settling particles were collected by time-series sediment trap moored at station KNOT (44N 155E, water depth 770m) from October 25th 1999 to June 20th 2001, and from June 25th 2002 to May 11th 2006. Particulate nitrogen contents and its isotope ratios (d15N) in the collected samples were measured. The results of d15N showed the general variations that are lower during the spring bloom periods and higher during winter periods. In order to analyze quantitatively the factors controlling such variations, we used an ecosystem model including nitrogen isotopes. We will present the analyses obtained with the model.

Simulation of REEs by an ocean general circulation model
OKA AKIRA; Hasumi Hiroyasu; Obata Hajime; Gamo Toshitaka; Yamanaka Yasuhiro
Abstracts of Annual Meeting of the Geochemical Society of Japan, 55, 366, 366, GEOCHEMICAL SOCIETY OF JAPAN, 2008
海洋大循環モデルを用いた希土類元素のシミュレーションを行い、北太平洋における鉛直濃度分布を決めるプロセスについて議論した。さまざまなソース・シンク項の影響をそれぞれ評価するための一連の数値実験の結果から、軽希土類元素と重希土類元素の分布の違いを説明するためには可逆的なscavenging過程が必要であることがわかった。つまり、粒子への吸着が強い軽希土類は深さとともに直線的に濃度が増加するのに対し、吸着の弱い重希土類は粒子の多い表層における濃度が減る栄養塩型の分布となることが示唆された。

Simulation of 50 Mton CO(2) injection per year into the ocean using an ocean general circulation model
Yoshio Masuda; Yasuhiro Yamanaka
OCEANS 2008 - MTS/IEEE KOBE TECHNO-OCEAN, VOLS 1-3, 779, 781, 2008, [Peer-reviewed], [Last author]
English, International conference proceedings

A numerical study with an eddy-resolving model to evaluate chronic impacts in CO2 ocean sequestration
Yoshio Masuda; Yasuhiro Yamanaka; Yoshikazu Sasai; Michimasa Magi; Takashi Ohsumi
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, 2, 1, 89, 94, Jan. 2008, [Peer-reviewed]
English, Scientific journal

Effects of storms on primary productivity and air-sea CO2 exchange in the subarctic western North Pacific: a modeling study
M. Fujii; Y. Yamanaka
BIOGEOSCIENCES, 5, 4, 1189, 1197, 2008, [Peer-reviewed], [Last author]
English, Scientific journal

Marine ecosystem simulation in the eastern tropical Pacific with a global eddy resolving coupled physical-biological model
Y. Sasai; H. Sasaki; K. Sasaoka; A. Ishida; Y. Yamanaka
GEOPHYSICAL RESEARCH LETTERS, 34, 23, L23601, Dec. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Compound effects of Antarctic sea ice on atmospheric pCO(2) change during glacial-interglacial cycle
T. Kurahashi-Nakamura; A. Abe-Ouchi; Y. Yamanaka; K. Misumi
GEOPHYSICAL RESEARCH LETTERS, 34, 20, L20708, Oct. 2007, [Peer-reviewed]
English, Scientific journal

Role of eddies in chlorofluorocarbon transport in wind-driven oceanic layers
Akio Ishida; Yoshikazu Sasai; Yasuhiro Yamanaka
JOURNAL OF PHYSICAL OCEANOGRAPHY, 37, 10, 2491, 2508, Oct. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Impact of circulation on export production, dissolved organic matter, and dissolved oxygen in the ocean: Results from Phase II of the Ocean Carbon-cycle Model Intercomparison Project (OCMIP-2)
R. G. Najjar; X. Jin; F. Louanchi; O. Aumont; K. Caldeira; S. C. Doney; J. -C. Dutay; M. Follows; N. Gruber; F. Joos; K. Lindsay; E. Maier-Reimer; R. J. Matear; K. Matsumoto; P. Monfray; A. Mouchet; J. C. Orr; G. -K. Plattner; J. L. Sarmiento; R. Schlitzer; R. D. Slater; M. -F. Weirig; Y. Yamanaka; A. Yool
GLOBAL BIOGEOCHEMICAL CYCLES, 21, 3, GB3007, Aug. 2007, [Peer-reviewed]
English

Modeling study on glacial-interglacial variations of atmospheric CO2 concentration: The effect of Southern Ocean
Takasumi Kurahashi-Nakamupa; Ayako Abe-Ouchi; Yasuhiro Yamanaka
GEOCHIMICA ET COSMOCHIMICA ACTA, 71, 15, A531, A531, Aug. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Optimization-based model of multinutrient uptake kinetics
S. Lan Smith; Yasuhiro Yamanaka
LIMNOLOGY AND OCEANOGRAPHY, 52, 4, 1545, 1558, Jul. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Effect of temperature-dependent organic carbon decay on atmospheric pCO2
Katsumi Matsumoto; Taketo Hashioka; Yasuhiro Yamanaka
Journal of Geophysical Research: Biogeosciences, 112, 2, G02007, Blackwell Publishing Ltd, 28 Jun. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Role of nitrification and denitrification on the nitrous oxide cycle in the eastern tropical North Pacific and Gulf of California
Hiroaki Yamagishi; Marian B. Westley; Brian N. Popp; Sakae Toyoda; Naohiro Yoshida; Shuichi Watanabe; Keisuke Koba; Yasuhiro Yamanaka
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 112, G2, G02015-G02015-15, May 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Effect of temperature-dependent organic carbon decay on atmospheric pCO(2)
Katsumi Matsumoto; Taketo Hashioka; Yasuhiro Yamanaka
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES, 112, G2, Apr. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Comparison of seasonal characteristics in biogeochemistry among the subarctic North Pacific stations described with a NEMURO-based marine ecosystem model
Masahiko Fujii; Yasuhiro Yamanaka; Yukihiro Nojiri; Michio J. Kishi; Fei Chai
Ecological Modelling, 202, 1-2, 52, 67, 24 Mar. 2007, [Peer-reviewed]
English, Scientific journal

North Pacific basin-scale differences in lower and higher trophic level marine ecosystem responses to climate impacts using a nutrient-phytoplankton-zooplankton model coupled to a fish bioenergetics model
Bernard A. Megrey; Kenneth A. Rose; Shin-ichi Ito; Douglas E. Hay; Francisco E. Werner; Yasuhiro Yamanaka; Maki Noguchi Aita
ECOLOGICAL MODELLING, 202, 1-2, 196, 210, Mar. 2007, [Peer-reviewed]
English, Scientific journal

NEMURO - a lower trophic level model for the North Pacific marine ecosystem
Michio J. Kishi; Makoto Kashiwai; Daniel M. Ware; Bernard A. Megrey; David L. Eslinger; Francisco E. Werner; Maki Noguchi-Aita; Tomonori Azumaya; Masahiko Fujii; Shinji Hashimoto; Daji Huang; Hitoshi Iizumi; Yukimasa Ishida; Sukyung Kang; Gennady A. Kantakov; Hyun-cheol Kim; Kosei Komatsu; Vadim V. Navrotsky; S. Lan Smith; Kazuaki Tadokoro; Atsushi Tsuda; Orio Yamamura; Yasuhiro Yamanaka; Katsumi Yokouchi; Naoki Yoshie; Jing Zhang; Yury I. Zuenko; Vladimir I. Zvalinsky
ECOLOGICAL MODELLING, 202, 1-2, 12, 25, Mar. 2007, [Peer-reviewed]
English, Scientific journal

Interdecadal variation of the lower trophic ecosystem in the northern Pacific between 1948 and 2002, in a 3-D implementation of the NEMURO model
Maki Noquchi Aita; Yasuhiro Yamanaka; Michio J. Kishi
ECOLOGICAL MODELLING, 202, 1-2, 81, 94, Mar. 2007, [Peer-reviewed]
English, Scientific journal

On the interannual variability of the growth of Pacific saury (Cololabis saira): A simple 3-box model using NEMURO.FISH
Shin-Ichi Ito; Bernard A. Megrey; Michio J. Kishi; Daiki Mukai; Yutaka Kurita; Yasuhiro Ueno; Yasuhiro Yamanaka
ECOLOGICAL MODELLING, 202, 1-2, 174, 183, Mar. 2007, [Peer-reviewed]
English, Scientific journal

Parameter sensitivity study of the NEMURO lower trophic level marine ecosystem model
Naoki Yoshie; Yasuhiro Yamanaka; Kenneth A. Rose; David L. Eslinger; Daniel M. Ware; Michio J. Kishi
ECOLOGICAL MODELLING, 202, 1-2, 26, 37, Mar. 2007, [Peer-reviewed]
English, Scientific journal

Seasonal and regional variations of phytoplankton groups by top-down and bottom-up controls obtained by a 3D ecosystem model
Taketo Hashioka; Yasuhiro Yamanaka
ECOLOGICAL MODELLING, 202, 1-2, 68, 80, Mar. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Quantitative comparison of photoacclimation models for marine phytoplankton
S. Lan Smith; Yasuhiro Yamanaka
ECOLOGICAL MODELLING, 201, 3-4, 547, 552, Mar. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Simulated herring growth responses in the Northeastern Pacific to historic temperature and zooplankton conditions generated by the 3-dimensional NEMURO nutrient-phytoplankton-zooplankton model
Kenneth A. Rose; Francisco E. Werner; Bernard A. Megrey; Maki Noguchi Aita; Yasuhiro Yamanaka; Douglas E. Hay; Jake F. Schweigert; Matthew Birch Foster
ECOLOGICAL MODELLING, 202, 1-2, 184, 195, Mar. 2007, [Peer-reviewed]
English, Scientific journal

Ecosystem change in the western North Pacific associated with global warming using 3D-NEMURO
Taketo Hashioka; Yasuhiro Yamanaka
ECOLOGICAL MODELLING, 202, 1-2, 95, 104, Mar. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Examining the regeneration of nitrogen by assimilating data from incubations into a multi-element ecosystem model
S. Lan Smith; B. E. Casareto; M. P. Niraula; Y. Suzuki; J. C. Hargreaves; J. D. Annan; Y. Yamanaka
JOURNAL OF MARINE SYSTEMS, 64, 1-4, 135, 152, Jan. 2007, [Peer-reviewed], [Last author]
English, Scientific journal

Decomposition of sinking particulate nitrogen in the twilight zone in the western subarctic Pacific and its influence on the nitrogen isotopic ratio
Shigemitsu Masahito; Watanabe Yutaka; Yamanaka Yasuhiro; Honda Makio
Abstracts of Annual Meeting of the Geochemical Society of Japan, 54, 24, 24, GEOCHEMICAL SOCIETY OF JAPAN, 2007
The objective of this research is to obtain the knowledge about decomposition of sinking particulate nitrogen in the twilight zone ( depths below the euphotic zone to 1000m) in the western subarctic Pacific and its influence on the nitrogen isotopic ratio. Samples were collected from March 20th, 2005 to September 18th, 2005 at 150m, 540m and 1000m water depth using time series sediment trap system. First, the simple settling model which could reconstruct the fluxes of settling particles at 540m and 1000m using the settling particle fluxes at 150m as initial values, was developed. In this model, following assumptions were made: 1) Total components sink simultaneously as same aggregates. 2) Organic materials, Calcium Carbonate and Opal in main components of sinking particles decompose in settling process. 3) Particle settling rates increase with depth. 4) Ballast minerals (Calcium Carbonate, Opal and Lithogenic materials) have constant organic matters that are protected from remineralization. We will report the results of analyzing the above objective based on this model.

Response of marine biogeochemical cycles to massive volcanic activities: implications for cause of Ocean Anoxic Events
Misumi Kazuhiro; Yamanaka Yasuhiro; Tajika Eiichi
Annual Meeting of the Geological Society of Japan, 2007, 110, 110, The Geological Society of Japan, 2007
Japanese

生態系モデル”eNEMURO”の開発と時系列観測研究への応用
Yoshie, N; Y. Yamanaka; T. Hashioka; M. Fujii
Kaiyo Monthly, 39, 2, 2, 10, 2007
Japanese

Nitrate-nitrogen isotopic patterns in surface waters of the western and central equatorial Pacific
Chisato Yoshikawa; Yasuhiro Yamanaka; Takeshi Nakatsuka
JOURNAL OF OCEANOGRAPHY, 62, 4, 511, 525, Aug. 2006, [Peer-reviewed]
English, Scientific journal

A global eddy-resolving coupled physical-biological model: Physical influences on a marine ecosystem in the North Pacific
Yoshikazu Sasai; Akio Ishida; Hideharu Sasaki; Shintaro Kawahara; Hitoshi Uehara; Yasuhiro Yamanaka
SIMULATION-TRANSACTIONS OF THE SOCIETY FOR MODELING AND SIMULATION INTERNATIONAL, 82, 7, 467, 474, Jul. 2006, [Peer-reviewed], [Last author]
English, Scientific journal

A comparison of global estimates of marine primary production from ocean color
Mary-Elena Carr; Marjorie A. M. Friedrichs; Marjorie Schmeltz; Maki Noguchi Aita; David Antoine; Kevin R. Arrigo; Ichio Asanuma; Olivier Aumont; Richard Barber; Michael Behrenfeld; Robert Bidigare; Erik T. Buitenhuis; Janet Campbell; Aurea Ciotti; Heidi Dierssen; Mark Dowell; John Dunne; Wayne Esaias; Bernard Gentili; Watson Gregg; Steve Groom; Nicolas Hoepffner; Joji Ishizaka; Takahiko Kameda; Corinne Le Quere; Steven Lohrenz; John Marra; Frederic Melin; Keith Moore; Andre Morel; Tasha E. Reddy; John Ryan; Michele Scardi; Tim Smyth; Kevin Turpie; Gavin Tilstone; Kirk Waters; Yasuhiro Yamanaka
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 53, 5-7, 741, 770, 2006, [Peer-reviewed]
English, Scientific journal

2006A-OS3-8 Simulation of transport and dilution of the injected CO_2 in the North Pacific
Masuda Yoshio; Yamanaka Yasuhiro; Sasai Yoshikazu
Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers, 3, 53, 54, The Japan Society of Naval Architects and Ocean Engineers, 2006
Japanese

O-9 A simulation of Ocean Anoxic Events in the mid-Cretaceous
Misumi Kazuhiro; Yamanaka Yasuhiro
Annual Meeting of the Geological Society of Japan, 2006, 48, The Geological Society of Japan, 2006
Japanese

地球温暖化と海洋酸性化の海洋への影響 (特集 海洋・沿岸域の長期展望) -- (環境面)
山中 康裕
沿岸域学会誌, 19, 1, 41, 43, 日本沿岸域学会, 2006, [Peer-reviewed]
Japanese

Modeling studies investigating the causes of preferential depletion of silicic acid relative to nitrate during SERIES, a mesoscale iron enrichment in the NE subarctic Pacific
S. Takeda; N. Yoshie; P. W. Boyd; Y. Yamanaka
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 53, 20-22, 2297, 2326, 2006, [Peer-reviewed]
English, Scientific journal

Processes causing the temporal changes in Si/N ratios of nutrient consumptions and export flux during the spring diatom bloom
N Yoshie; Y Yamanaka
JOURNAL OF OCEANOGRAPHY, 61, 6, 1059, 1073, Dec. 2005, [Peer-reviewed], [Last author]
English, Scientific journal

Roles of biogeochemical: Processes in the oceanic carbon cycle described with a simple coupled physical-biogeochemical model
M Fujii; M Ikeda; Y Yamanaka
JOURNAL OF OCEANOGRAPHY, 61, 5, 803, 815, Oct. 2005, [Peer-reviewed], [Last author]
English, Scientific journal

An ecosystem model including nitrogen isotopes: Perspectives on a study of the marine nitrogen cycle
C Yoshikawa; Y Yamanaka; T Nakatsuka
JOURNAL OF OCEANOGRAPHY, 61, 5, 921, 942, Oct. 2005, [Peer-reviewed]
English, Scientific journal

Anthropogenic ocean acidification over the twenty-first century and its impact on calcifying organisms
JC Orr; VJ Fabry; O Aumont; L Bopp; SC Doney; RA Feely; A Gnanadesikan; N Gruber; A Ishida; F Joos; RM Key; K Lindsay; E Maier-Reimer; R Matear; P Monfray; A Mouchet; RG Najjar; GK Plattner; KB Rodgers; CL Sabine; JL Sarmiento; R Schlitzer; RD Slater; IJ Totterdell; MF Weirig; Y Yamanaka; A Yool
NATURE, 437, 7059, 681, 686, Sep. 2005, [Peer-reviewed]
English, Scientific journal

Sedimentary responses to an abrupt change of biogenic silica flux by a sediment model for long timescale simulations
MO Chikamoto; Y Yamanaka
JOURNAL OF OCEANOGRAPHY, 61, 4, 733, 746, Aug. 2005, [Peer-reviewed], [Last author]
English, Scientific journal

Ecosystem changes after the SEEDS iron fertilization in the western North Pacific simulated by a one-dimensional ecosystem model
Naoki Yoshie; Masahiko Fujii; Yasuhiro Yamanaka
Progress in Oceanography, 64, 2-4, 283, 306, Feb. 2005, [Peer-reviewed]
English, Scientific journal

Attempting consistent simulations of Stn. ALOHA with a multi-element ecosystem model
SL Smith; Y Yamanaka; MJ Kishi
JOURNAL OF OCEANOGRAPHY, 61, 1, 1, 23, Feb. 2005, [Peer-reviewed]
English, Scientific journal

Spreading of Antarctic Bottom Water examined using the CFC-11 distribution simulated by an eddy-resolving OGCM.
Sasai Y, A. Ishida, H. Sasaki, S. Kawahara, H. Uehara and Y. Yamanaka
Polar Meteorol. Glaciol., 19, 15, 27, National Institute of Polar Research, 2005, [Peer-reviewed], [Last author]
English, Scientific journal, We have investigated the spreading and pathway of Antarctic Bottom Water(AABW) using the simulated distribution of chlorofluorocarbons(CFCs) in a global eddy-resolving(1/10°) OGCM. Our goal is understanding of the processes and pathways determining the distribution of CFCs in the Southern Ocean, where much of this tracer is entrained by formation of deep and bottom water. The simu- lated high CFC-11 water reveals the newly formed AABW around the Antarctic Continent. The main source regions of AABW in the model are in the Weddell Sea(60°- 30°W ), offshore of Wilkes Land(120°- 160°E ) and in the Ross Sea(170°E -160°W ). In our model, spreading of simulated CFC-11 in the deep Southern Ocean from the newly formed AABW regions is more similar to the observed distribution than in coarse-resolution models. In the Weddell Sea, the high CFC-11 water spreads eastward with the Antarctic Circumpolar Current(ACC) and flows northward to the Argentine Basin. The high CFC-11 water from Wilkes Land joins with the high CFC-11 water from the Ross Sea. Some of the high CFC-11 water from Wilkes Land flows northward toward New Zealand. The high CFC-11 water from the Ross Sea flows eastward with the ACC along the Mid Ocean Ridge and northward to the Southeast Pacific Basin.

Sedimentary responses an abrupt change of silicate flux using a sediment model with long time series. J. Oceanogr., 61:733-746(2005)*
Chikamoto O. M; Y. Yamanaka
2005, [Peer-reviewed], [Last author]

A simulation of Ocean Anoxic Event in the mid-Cretaceous
Misumi Kazuhiro; Yamanaka Yasuhiro
Annual Meeting of the Geological Society of Japan, 2005, 56, The Geological Society of Japan, 2005
Japanese

Simulated biogeochemical responses to iron enrichments in three high nutrient, low chlorophyll (HNLC) regions
M Fujii; N Yoshie; Y Yamanaka; F Chai
PROGRESS IN OCEANOGRAPHY, 64, 2-4, 307, 324, 2005, [Peer-reviewed]
English

A lagrangian method combined with high-resolution ocean general circulation model to evaluate CO2 ocean sequestration
Yoshio Masuda; Yasuhiro Yamanaka; Taketo Hashioka; Michimasa Magi; Shigeo Murai; Takashi Ohsumi
Greenhouse Gas Control Technologies, 819, 827, Elsevier Ltd, 2005, [Peer-reviewed]
English, In book

Initial design for a fish bioenergetics model of Pacific saury coupled to a lower trophic ecosystem model
S Ito; MJ Kishi; Y Kurita; Y Oozeki; Y Yamanaka; BA Megrey; FE Werner
FISHERIES OCEANOGRAPHY, 13, 1, 111, 124, Dec. 2004, [Peer-reviewed]
English, Scientific journal

Evaluating global ocean carbon models: The importance of realistic physics
SC Doney; K Lindsay; K Caldeira; JM Campin; H Drange; JC Dutay; M Follows; Y Gao; A Gnanadesikan; N Gruber; A Ishida; F Joos; G Madec; E Maier-Reimer; JC Marshall; RJ Matear; P Monfray; A Mouchet; R Najjar; JC Orr; GK Plattner; J Sarmiento; R Schlitzer; R Slater; IJ Totterdell; MF Weirig; Y Yamanaka; A Yool
GLOBAL BIOGEOCHEMICAL CYCLES, 18, 3, n/a, n/a, Sep. 2004, [Peer-reviewed]
English, Scientific journal

Ocean circulation in the Japan Sea from the CFC-11 distribution : Results of CFC-11 simulation in an eddy-resolving OGCM
SASAI Yoshikazu; ISHIDA Akio; YAMANAKA Yasuhiro; SASAKI Hideharu
海と空, 80, 1, 3, 8, 海洋気象学会, Jul. 2004, [Peer-reviewed]
Japanese, コレクション : 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > 学術機関 > 学協会

Evaluation of OCMIP-2 ocean models' deep circulation with mantle helium-3
JC Dutay; P Jean-Baptiste; JM Campin; A Ishida; E Maier-Reimer; RJ Matear; A Mouchet; IJ Totterdell; Y Yamanaka; K Rodgers; G Madec; JC Orr
JOURNAL OF MARINE SYSTEMS, 48, 1-4, 15, 36, Jul. 2004, [Peer-reviewed]
English, Scientific journal

Chlorofluorocarbons in a global ocean eddy-resolving OGCM: Pathway and formation of Antarctic Bottom Water
Y Sasai; A Ishida; Y Yamanaka; H Sasaki
GEOPHYSICAL RESEARCH LETTERS, 31, 12, n/a, n/a, Jun. 2004, [Peer-reviewed]
English, Scientific journal

Evaluation of ocean carbon cycle models with data-based metrics
K Matsumoto; JL Sarmiento; RM Key; O Aumont; JL Bullister; K Caldeira; JM Campin; SC Doney; H Drange; JC Dutay; M Follows; Y Gao; A Gnanadesikan; N Gruber; A Ishida; F Joos; K Lindsay; E Maier-Reimer; JC Marshall; RJ Matear; P Monfray; A Mouchet; R Najjar; GK Plattner; R Schlitzer; R Slater; PS Swathi; IJ Totterdell; MF Weirig; Y Yamanaka; A Yool; JC Orr
GEOPHYSICAL RESEARCH LETTERS, 31, 7, Apr. 2004, [Peer-reviewed]
English, Scientific journal

An ecosystem model coupled with nitrogen-silicon-carbon cycles applied to station A7 in the northwestern Pacific
Y Yamanaka; N Yoshie; M Fujii; MN Aita; MJ Kishi
JOURNAL OF OCEANOGRAPHY, 60, 2, 227, 241, Apr. 2004, [Peer-reviewed]
English, Scientific journal

A comparison of simulated particle fluxes using NEMURO and other ecosystem models in the western North Pacific
MJ Kishi; T Okunishi; Y Yamanaka
JOURNAL OF OCEANOGRAPHY, 60, 1, 63, 73, Feb. 2004, [Peer-reviewed]
English, Scientific journal

A series of eddy-resolving ocean simulations in the world ocean - OFES (OGCM for the Earth Simulator) project
H Sasaki; Y Sasai; S Kawahara; M Furuichi; F Araki; A Ishida; Y Yamanaka; Y Masumoto; H Sakuma
OCEANS '04 MTS/IEEE TECHNO-OCEAN '04, VOLS 1- 2, CONFERENCE PROCEEDINGS, VOLS. 1-4, 3, 1535, 1541, 2004, [Peer-reviewed]
English, International conference proceedings

One dimensional ecosystem model simulation of the effects of vertical dilution by the winter mixing on the spring diatom bloom
N Yoshie; Y Yamanaka; MJ Kishi; H Saito
JOURNAL OF OCEANOGRAPHY, 59, 5, 563, 571, Oct. 2003, [Peer-reviewed]
English, Scientific journal

Earth system variations during the Cretaceous
Eiichi Tajika E; Yasuhiro Yamanaka
Fossils, 0, 74, 27, 35, 日本古生物学会, 20 Sep. 2003, [Peer-reviewed]
Japanese

Effects of ontogenetic vertical migration of zooplankton on annual primary production - using NEMURO embedded in a general circulation model
MN Aita; Y Yamanaka; MJ Kishi
FISHERIES OCEANOGRAPHY, 12, 4-5, 284, 290, Sep. 2003, [Peer-reviewed]
English, Scientific journal

Oceanic anoxic events and stagnation of ocean circulation(Dynamics of the Earth system and mass extinction)
Yamanaka Yasuhiro
Planetary People, 11, 1, 20, 28, 日本惑星科学会, 01 Mar. 2002, [Peer-reviewed]
Japanese

Evaluation of ocean model ventilation with CFC-11: comparison of 13 global ocean models
J. -C. Dutay; J. L. Bullister; S. C. Doney; J. C. Orr; R. Najjar; K. Caldeira; J. -M. Campin; H. Drange; M. Follows; Y. Gao; N. Gruber; M. W. Hecht; A. Ishida; F. Joos; K. Lindsay; G. Madec; E. Maier-Reimer; J. C. Marshall; R. J. Matear; P. Monfray; A. Mouchet; G. -K. Plattner; J. Sarmiento; R. Schlitzer; R. Slater; I. J. Totterdell; M. -F. Weirig; Y. Yamanaka; A. Yool
OCEAN MODELLING, 4, 2, 89, 120, 2002, [Peer-reviewed]
English, Scientific journal

A one-dimensional ecosystem model applied to time-series Station KNOT
M Fujii; Y Nojiri; Y Yamanaka; MJ Kishi
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 49, 24-25, 5441, 5461, 2002, [Peer-reviewed]
English, Scientific journal

Comparison of two classical advection schemes in a general circulation model
Y Yamanaka; R Furue; H Hasumi; N Suginohara
JOURNAL OF PHYSICAL OCEANOGRAPHY, 30, 9, 2439, 2451, Sep. 2000, [Peer-reviewed], [Lead author]
English, Scientific journal

Roles of physical processes in the carbon cycle using a simplified physical model
M. Fujii; M. Ikeda; Y. Yamanaka
Journal of Oceanography, 56, 6, 655, 666, 2000, [Peer-reviewed], [Last author]
English, Scientific journal

Role of dissolved organic matter in the marine biogeochemical cycle: Studies using an ocean biogeochemical general circulation-model
Y Yamanaka; E Tajika
GLOBAL BIOGEOCHEMICAL CYCLES, 11, 4, 599, 612, Dec. 1997, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

Obtaining reasonable results in different oceanic regimes with the same ecological-physical coupled model
Kawamiya M; Kishi M.J; Yamanaka Y; Suginohara N
Journal of Oceanography, 53, 4, 397, 402, Oceanographic Society of Japan, 1997, [Peer-reviewed]
English

The role of the vertical fluxes of particulate organic matter and calcite in the oceanic carbon cycle: Studies using an ocean biogeochemical general circulation model
Y Yamanaka; E Tajika
GLOBAL BIOGEOCHEMICAL CYCLES, 10, 2, 361, 382, Jun. 1996, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal

An ecological-physical coupled model applied to Station Papa
Michio Kawamiya; Michio J. Kishi; Yasuhiro Yamanaka; Nobuo Suginohara
Journal of Oceanography, 51, 6, 635, 664, Kluwer Academic Publishers, Nov. 1995, [Peer-reviewed]
English, Scientific journal

Effects of presence of a circumpolar region on buoyancy-driven circulation
I. Ishikawa; Y. Yamanaka; N. Suginohara
Journal of Oceanography, 50, 3, 247, 263, Kluwer Academic Publishers, May 1994, [Peer-reviewed]
English, Scientific journal

Basic Research Expands the Knowledge Horizon and Drives Our World
YAMANAKA Yasuhiro, TRENDS IN THE SCIENCES, 27, 2, 2_19, 2_22, 01 Feb. 2022
Japan Science Support Foundation, Japanese

基礎研究は視野を広げ世界を動かす—眞鍋淑郎博士の2021年ノーベル物理学賞受賞
山中 康裕, 学術の動向 = Trends in the sciences / 『学術の動向』編集委員会 編, 27, 2, 19, 22, Feb. 2022
東京 : 日本学術協力財団, Japanese

亜表層クロロフィル極大を再現できるモデルを用いた一次生産の鉛直分布の解析
増田良帆; 野口真希; SMITH S. Lan; 山中康裕; 中野英之, 日本海洋学会大会講演要旨集(Web), 2022, 2022

3B04 Development of experimental materials to learn greenhouse effect－Photoacoustic experimental system to measure the infrared absorption due to greenhouse gases－
FUKUHARA Akiko; YAMANAKA Yasuhiro, Proceedings of Annual Conference of Japanese Society for Engineering Education, 2022, 284, 285, 2022
Japanese Society for Engineering Education, Japanese

積雪寒冷地の特性を活かした北海道占冠村での産学官連携の取り組み
中村一樹; 山中康裕; 佐藤友徳, 日本気象学会大会講演予稿集, 112, 2017

研究総合大学における「環境」に関する科目 : どの大学院の科目として「環境」はどのように教えられているか?—日本教育情報学会第32回年会 ; 教職開発研究会
三井 翔太; 島村 道代; 山中 康裕, 年会論文集, 32, 54, 57, Aug. 2016
[岐阜] : 日本教育情報学会, Japanese

気候変動に対応した循環型食料生産等の確立のためのプロジェクト-水産分野における温暖化緩和技術の開発-地球温暖化が水産分野に与える影響評価と適応技術の開発-第1編 水産分野における温暖化緩和技術の開発 第2章 日本周辺海域の高解像度炭素・窒素循環モデルの開発 1 日本周辺海域の高解像度炭素・窒素循環モデルの開発
山中康裕; 熊けん睿; 増田良帆; 重光雅仁; 佐藤祐介; 干場康博; 柴野良太; 田中朱美; 宮崎千尋, 農林水産省農林水産技術会議事務局研究成果, 559, 2016

Enhanced deep ocean ventilation and global deep ocean oxygenation with global warming
Yamamoto Akitomo; Abe-Ouchi Ayako; Shigemitsu Masahito; Oka Akira; Takahashi Kunio; Ohgaito Rumi; Yamanaka Yasuhiro, Abstracts of Annual Meeting of the Geochemical Society of Japan, 62, 91, 2015
地球温暖化は海洋中の溶存酸素を全球的に減少させると考えられており,海洋生態系や物質循環への影響が懸念されている.簡略化モデルを用いた先行研究では,酸素濃度は1000年以上減少し続け,全球平均濃度は30%程度減少すると予想されている.しかし簡略化モデルを用いているため不確実性が大きいと考えられる.

本研究では,より現実的な海洋循環を表現するGCM(MIROC3.2)とoffline海洋物質循環モデルを用いて温暖化実験(2, 4倍CO2実験)を2000年積分し, 酸素濃度の変化を計算した.

最初の500年では,先行研究と同様に海水温上昇と成層化により溶存酸素は全球的に減少した.しかしその後,表層の酸素減少とAMOCの減少は続いているにも関わらず,中深層の酸素濃度は全球的に回復し,最終的に全球平均の酸素濃度は産業革命前の濃度よりも高くなった.この酸素回復はウェッデル海における深層対流が一時的に停止した後に回復することで,深層に酸素が送り込まれた為に引き起こされることが分かった., GEOCHEMICAL SOCIETY OF JAPAN, Japanese

全球コムギ生産に関する適応パスの分析
田中朱美; 高橋潔; 増冨祐司; 花崎直太; 肱岡靖明; 塩竃秀夫; 山中康裕, 日本農業気象学会全国大会講演要旨, 2015, 120, 2015
Japanese

物理・生態システムさらには人間システムのつながりをモデルで描く
高橋潔; 三枝信子; 及川武久; 河宮未知生; 羽島知洋; 山中康裕; 平田貴文; 阿部彩子, 地球環境, 20, 2, 135, 142, 2015
国際環境研究協会, Japanese

Elemental distribution of dry and wet depositions of soluble aerosols in Tomamu
Iizuka Yoshinori; Nakamura Kazuki; Sato Tomonori; Yamanaka Yasuhiro, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2014, 142, 2014
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

トマム地域における水溶性の乾性・湿性沈着エアロゾルの組成分布に関する初期的結果
飯塚芳徳; 中村一樹; 佐藤友徳; 山中康裕, 北海道の雪氷, 33, 129, 132, 2014

海洋生態系や生物地球化学物質循環解析のための衛星リモートセンシングによる海洋植物プランクトン群衆構造のデータセット
平田貴文; 相田真希; 増田良帆; 橋岡豪人; 鈴木光次; 山中康裕; 村上浩, 日本海洋学会大会講演要旨集, 2013, 2013

降雪結晶が原因となる表層雪崩弱層形成のモデル化
中村一樹; 藤吉康志; 佐藤友徳; 平島寛行; 山口悟; 西村浩一; 山中康裕, 日本気象学会大会講演予稿集, 102, 102, 497, 497, 30 Sep. 2012
日本気象学会, Japanese

降雪結晶形が原因となる弱層形成のモデル化
中村一樹; 藤吉康志; 佐藤友徳; 平島寛行; 山口悟; 西村浩一; 山中康裕, 雪氷研究大会講演要旨集, 2012, 183, 183, 10 Sep. 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, Japanese

春季ブルームにおける植物プランクトンの種間競争のメカニズム~国際的な海洋生態系モデルの相互比較研究から~
橋岡豪人; 橋岡豪人; 橋岡豪人; 橋岡豪人; VOGT M.; 山中康裕; 山中康裕; 山中康裕; LE QUERE C.; LE QUERE C.; BUITENHUIS E. T.; 相田(野口)真希; ALVAIN S.; BOPP L.; DONEY S. C.; 平田貴文; LIMA I.; SAILLEY S., 日本海洋学会大会講演要旨集, 2012, 2012

Seasonal evolution of the subsurface saturation anomaly of N2 and Ar in the northwestern subarctic Pacific
Shigemitsu Masahito; Gruber Nicolas; Yamanaka Yasuhiro, Abstracts of Annual Meeting of the Geochemical Society of Japan, 59, 7, 2012
The ratio of N2 to Ar dissolved in seawater is an important constraint for marine N2-fixation and denitrification. This use requires, however, accurate knowledge of the influence of other processes, such as surface heating and air-sea exchange, on the distribution of these two gases. To this end, we investigated how subsurface saturation anomalies of N2 and Ar evolve from spring to autumn in the northwestern subarctic Pacific. A series of sensitivity experiments with a one-dimensional model indicate that for both gases, sea level pressure variations tend to create undersaturations, while heat flux and mixing induce supersaturation. In contrast, bubble-mediated gas exchange causes supersaturation only for N2. We show that this differential sensitivity to bubble mediated gas exchange causes the generation of N2/Ar anomalies which affect the entire seasonal evolution and thus need to be considered when using N2/Ar anomalies for constraining N2-fixation and/or denitrification., GEOCHEMICAL SOCIETY OF JAPAN, Japanese

寒冷な地域特性を活かした産官学発展の取り組み~星野リゾートトマム・占冠村・北海道大学の三者が発展する連携へ~
中村一樹; 吉村暢彦; 根岸淳二郎; 佐藤祐介; 佐藤友徳; 山中康裕; 藤吉康志; 佐藤志穂; 山岸奈津子; 田中大介; 星宏聡; 上林宣夫; 橋本亮一; 今野裕次郎; 鈴木和仁; 佐藤大介; 岡崎善二; 藤本武; 中村博, 寒地技術論文・報告集(CD-ROM), 28, 2012

トマムにおける雲海発生メカニズムの研究と観光・教育への応用
中村一樹; 佐藤友徳; 藤吉康志; 佐藤祐介; 吉村暢彦; 山中康裕, 日本気象学会大会講演予稿集, 100, 100, 350, 350, 31 Oct. 2011
日本気象学会, Japanese

P101 トマムにおける雲海発生メカニズムの研究と観光・教育への応用(ポスター・セッション)
中村 一樹; 佐藤 友徳; 藤吉 康志; 佐藤 祐介; 吉村 暢彦; 山中 康裕, 大会講演予講集, 100, 0, 350, 350, 31 Oct. 2011
社団法人日本気象学会, Japanese

地球温暖化が農林水産業に与える影響評価 第2章 地球温暖化が水産業に与える影響評価(4)沖合域における海洋生態系モデルの高度化と水産業への温暖化影響評価技術の開発
伊藤進一; 亀田卓彦; 奥西武; 高須賀明典; 齊藤宏明; 小松幸生; 山中康裕, 農林水産省農林水産技術会議事務局研究成果, 483, 251, 255, 29 Jul. 2011
Japanese

SNOWPACKを用いた北海道の気候変動に伴う雪質変化推定の試み-擬似温暖化実験による予測-
中村一樹; 佐藤友徳; 山中康裕; 西村浩一, 雪氷研究大会講演要旨集, 2011, 2011

雪質変質モデルSNOWPACKを用いた地球温暖化による雪質変化推定の試み. −地球温暖化適応策検討の基礎データとして−
中村一樹; 佐藤友徳; 山中康裕; 西村浩一, 北海道の雪氷, 30, 123, 126, 2011

Estimation of snow structure with climate change in Hokkaido by SNOWPACK model
Kazuki Nakamura; Tomonori Sato; Yasuhiro Yamanaka; Kouichi Nishimura, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011, 50, 50, 2011
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, English

B368 新たな観光資源「トマムの雲海」を通じた産学連携の学びの実践 : トマム雲海仙人の雲修行(スペシャル・セッション「気象情報・知識の伝達・普及(II)」,口頭発表)
中村,一樹; 佐藤,祐介; 吉村,暢彦; 森,佳祐; 久保,拓士; 渡邊,恵実; 田沼,大和; 山中,康裕; 藤吉,康志; 鈴木,和仁; 橋本,亮一; 星,宏聡; 今野,裕次郎; 田中,大介; 今里,舞; 山岸,奈津子; 近藤,真弘, 大会講演予講集, 98, 185, 30 Sep. 2010
日本気象学会, Japanese

海洋低次生態系の温暖化に対する応答 : NEMUROによる予測
橋岡 豪人; 坂本 天; 山中 康裕, 水産資源管理談話会報, 44, 0, 21, 36, 01 Sep. 2010
日本鯨類研究所資源管理研究センター, Japanese

低次生態系モデルを用いた親潮域における海洋表層鉄循環の解析
重光雅仁; 奥西武; 西岡純; 須股浩; 橋岡豪人; 相田真希; 相田真希; SMITH S.L.; 吉江直樹; 山中康裕, 日本海洋学会大会講演要旨集, 2010, 2010

グローバルCOEプログラム拠点リーダーによるささやかな試み (特集 グローバル・サステイナビリティの構想と展開)
山中 康裕, サステナ, 0, 14, 40, 44, Jan. 2010
サステイナビリティ学連携研究機構, Japanese

Future changes in seasonality of marine ecosystems projected by an eddy-permitting 3-D ecosystem model
IGBP/IMBER Newsletter, 16, 87, 2010

地球温暖化に伴う海水温上昇が日本近海のサンゴ分布および健康状態に及ぼす影響評価.
日本サンゴ礁学会誌, 11, 1, 10, 2009

温暖化シナリオ下において予期される低次生態系変動と酸性化
山中 康裕; 岡田 直資; 橋岡 豪人, 水産海洋研究, 72, 4, 285, 286, 01 Nov. 2008
Japanese

沖合小型浮魚類への温暖化影響
伊藤 進一; 志藤 文武; 山中 康裕; 橋岡 豪人; 高須賀 明典; 奥西 武, 水産海洋研究, 72, 4, 288, 289, 01 Nov. 2008
Japanese

A309 海洋の物理的変化が及ぼす大気二酸化炭素濃度への影響 : 氷期-間氷期サイクル(気候システムIII)
倉橋,貴純; 阿部,彩子; 山中,康裕, 大会講演予講集, 93, 72, 30 Apr. 2008
日本気象学会, Japanese

海洋酸性化:二酸化炭素が海洋に吸収される壮大な中和反応 (2007年の成果の総まとめ 特集:物理科学,この1年) -- (地球惑星物理)
山中 康裕, パリティ, 23, 1, 60, 62, Jan. 2008
丸善, Japanese

The importance of ocean transport in the fate of anthropogenic CO2
Biogeosciences Discuss, 5, 4521, 4557, 2008

海洋酸性化：二酸化炭素が海洋に吸収される壮大な中和反応
雑誌「パリティ」, 23, 1, 60, 60, 2008

Paleoclimate modeling
ABE(OUCHI) Ayako; YAMANAKA Yasuhiro, Tenki, 54, 12, 995, 998, 31 Dec. 2007
コレクション : 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > 学術機関 > 学協会, 社団法人日本気象学会, Japanese

S2-2 Studies of global warming(Symposium II Climate change and microbial ecology)
Yamanaka,Yasuhiro, 日本微生物生態学会講演要旨集, 180, 15 Sep. 2007
日本微生物生態学会, Japanese

S-110 Response of marine biogeochemical cycles to massive volcanic activities : implications for cause of Ocean Anoxic Events
Misumi Kazuhiro; Yamanaka Yasuhiro; Tajika Eiichi, 日本地質学会学術大会講演要旨, 114, 56, 01 Sep. 2007
The Geological Society of Japan, Japanese

Future projection of ecosystem change associated with global warming obtained by a numerical model
橋岡 豪人; 山中 康裕, Kaiyo monthly, 39, 5, 291, 297, May 2007
海洋出版, Japanese

生態系モデル"eNEMURO"の開発と時系列観測研究への応用 (総特集 北太平洋における時系列観測研究--現状と今後の展望)
吉江 直樹; 山中 康裕; 橋岡 豪人, 海洋, 39, 2, 118, 126, Feb. 2007
海洋出版, Japanese

3次元海洋生態系-炭素循環モデルにおける熱帯・北太平洋炭素循環の経年・10年規模変動
石田明生; 相田(野口)真希; 山中康裕; 山中康裕, 日本海洋学会大会講演要旨集, 2007, 2007

海洋科学統合モデリングの発展
山中 康裕, 日本地球惑星科学連合ニュースレター, 2, 4, 3, 5, Nov. 2006
日本地球惑星科学連合, Japanese

白亜紀の古海洋シミュレーション (総特集 現在と過去の無(貧)酸素環境(下)比較研究の必要性)
三角 和弘; 山中 康裕, 海洋, 37, 12, 872, 877, Dec. 2005
海洋出版, Japanese

気象ハンドブック第3版44章「炭素循環」
講談社, 2005

海からみた地球温暖化 インタビュー 地球温暖化の本当の恐ろしさは、目に見えずにじわりじわりと進行することなのです (特集 気候大変動--温暖化は何を引き起こしているか)
山中 康裕, 世界, 0, 731, 85, 93, Oct. 2004
岩波書店, Japanese

海洋物質循環・生態系の振舞いに対する気候変動の影響 (総特集 北太平洋の十年変動--物理・化学・生物の接点を求めて)
藤井 賢彦; 山中 康裕, 海洋, 35, 1, 65, 71, Jan. 2003
海洋出版, Japanese

岡田賞受賞者からの提言(<特集>21世紀の海洋学の展望1)
記載なし; 神田 穣太; 秋友 和典; 石坂 丞二; 酒井 敏; 江淵 直人; 長沼 毅; 渡辺 豊; 大島 慶一郎; 須賀 利雄; 中塚 武; 齊藤 宏明; 山中 康裕; 鈴木 利一; 藤尾 伸三; 市川 香, 海の研究 = Umi no Kenkyu (Oceanography in Japan), 11, 2, 225, 233, 05 Mar. 2002
日本海洋学会, Japanese

海洋物質循環に注目した海洋生態系モデル
山中, 康裕; 岸, 道郎, 66, 1, 61, 62, 28 Feb. 2002
水産海洋学会, Japanese

「海洋物質循環に注目した海洋生態系モデル」
山中 康裕; 岸 道郎, 『水産海洋研究(水産海洋学会誌)』, 66, 1, 61, 62, 28 Feb. 2002
水産海洋学会, Japanese

物質循環としての陸域・海洋生態系との相互作用(海洋)(日本気象学会2001年度春季大会シンポジウム「21世紀の気象学-将来展望-」の報告)
山中 康裕, 天気, 49, 1, 36, 42, 31 Jan. 2002
社団法人日本気象学会, Japanese

1.3.11. 物質循環(1.3. 力学過程・海洋モデリング)(1.海洋物理学)(第2章 我が国の海洋科学の進歩)
山中 康裕, 海の研究 = Umi no Kenkyu (Oceanography in Japan), 11, 1, 35, 35, 05 Jan. 2002
Japanese

1.3.11. 物質循環(1.3. 力学過程・海洋モデリング)(1.海洋物理学)(第2章 我が国の海洋科学の進歩)
山中 康裕, 海の研究, 11, 1, 05 Jan. 2002
日本海洋学会, Japanese

Ito, S., Kishi, M. J., Yamanaka, Y. and Fujii, M.:"Saury group report and model results", PICES Scientific Report, 20:114-127 (2002)*
2002

Simulating the cycling of organic matter using a nitrogen-based oceanic ecosystem model": carbon to nitrogen ratios
Smith, S. L; Yamanaka, Y; Kishi, M. J, PICES Scientific Report, 20, 6, 7, 2002
Summary international conference

「海洋物質循環・生態系の振舞いに対する気候変動の影響」
『月刊海洋』, 35, 65, 71, 2002

「物質循環としての陸域・海洋生態系との相互作用(海洋)」
『天気(日本気象学会誌)』, 49, 36, 42, 2002

海洋物質循環モデルによる投入C02の挙動の計算について (総特集 CO2海洋隔離--隔離技術と生物影響について)
山中 康裕, 海洋, 33, 11, 771, 774, Nov. 2001
海洋出版, Japanese

海洋物質循環モデリング (総特集 海洋モデリングの新世紀--更なる発展には何が必要か?)
山中 康裕, 海洋, 33, 9, 612, 617, Sep. 2001
海洋出版, Japanese

沼口 敦会員の急逝を悼む
山中 康裕, 天気, 48, 8, 577, 578, 31 Aug. 2001
社団法人日本気象学会, Japanese

海洋物質循環モデルで再現された窒素循環 (総特集 海洋窒素サイクル--その21世紀の課題)
山中 康裕, 海洋, 33, 7, 501, 503, Jul. 2001
海洋出版, Japanese

Roles of physical processes in the carbon cycle using a simplified physical model
Masahiko Fujii; Motoyoshi Ikeda; Yasuhiro Yamanaka, 海の研究 = Umi no Kenkyu (Oceanography in Japan), 10, 1, 85, 85, 05 Jan. 2001
Japanese

Roles of physical processes in the carbon cycle using a simplified physical model
Fujii Masahiko; Ikeda Motoyoshi; Yamanaka Yasuhiro, Umi no Kenkyu (Oceanography in Japan), 10, 1, 05 Jan. 2001
日本海洋学会, Japanese

窒素・珪素・炭素循環を組み込んだ生態系モデリング
山中康裕; 藤井賢彦; 吉江直樹; 岸道郎; 相田(野口)真希, 日本海洋学会大会講演要旨集, 2000, 2000

Optic phenomena observed on the flight
Yamanaka Yasuhiro, Tenki, 46, 11, 751, 752, 30 Nov. 1999
Meteorological Society of Japan, Japanese

Development of Ocean Biogeochemical General Circulation Model
Yamanaka Yasuhiro, Umi no Kenkyu (Oceanography in Japan), 8, 1, 25, 35, 05 Feb. 1999
Ocean biogeochemical general circulation models (B-GCMs), which are general circulation models coupled with simple biogeochemical processes, was developed during the early l990s. B-GCM can deal with the physical and biogeochemical processes together and make simulatiouts which are "directly" compared with the tracer distributions, such as phosphate, dissolved oxygen, δ^<13>C, Δ^<14>C, and so On, measured by many oceanographic expeditions. The study using B-GCM has clarified the relation between biological pump and the global nutrient distribtutions, and has estimated the production rates an..., 日本海洋学会, Japanese

Development of Ocean Biogeochemical General Circulation Model.
Yamanaka Yasuhiro, Journal of the Oceanographical Society of Japan, 8, 1, 25, 35, 1999
Ocean biogeochemical general circulation models (B-GCMs), which are general circulation models coupled with simple biogeochemical processes, was developed during the early l990s. B-GCM can deal with the physical and biogeochemical processes together and make simulatiouts which are "directly" compared with the tracer distributions, such as phosphate, dissolved oxygen, δ¹³C, Δ¹⁴C, and so On, measured by many oceanographic expeditions. The study using B-GCM has clarified the relation between biological pump and the global nutrient distribtutions, and has estimated the production rates and life time of Dissolved Organic Carbon (DOC). B-GCM can be used for the estimation of the ocean uptake of the anthropogenic carbon dioxide. B-GCM can also be a powerful tool of paleoceanography., The Oceanographic Society of Japan, Japanese

5. Modeling of Quatanary Climate Change
Yamanaka Yasuhiro; Abe-Ouchi Ayako, 日本地質学会学術大会講演要旨, 105, 0, 36, 36, 20 Mar. 1998
日本地質学会, Japanese

「海洋の生物地球化学物質循環モデルの開発」
山中 康裕, 『海の研究』, 8, 1, 25, 35, 1998

Modeling of Biogeochemical Cycles in the Ocean
Yamanaka Yasuhiro, Tenki, 44, 12, 835, 845, 31 Dec. 1997, [Lead author]
コレクション : 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > 学術機関 > 学協会, 社団法人日本気象学会, Japanese

大気海洋結合モデルでシミュレートされた北太平洋10年振動
木本 昌秀; 阿部 彩子; 山中 康裕; 沈 学順, 大会講演予講集, 71, 0, 51, 51, May 1997
Japanese

CCSR大循環モデルによる大気中CO_2増加に対する大気海洋結合系の応答(2) -水循環の変化-
阿部 彩子; 木本 昌秀; 山中 康裕, 大会講演予講集, 71, 0, 137, 137, May 1997
Japanese

大気中二酸化炭素増加に対する大気海洋結合系の応答
阿部 彩子; 山中 康裕; 木本 昌秀, 大会講演予講集, 70, 0, 19, 19, 06 Nov. 1996
Japanese

溶存有機物の生成分解速度と全海洋規模の濃度分布--海洋生物化学大循環モデルを用いた研究 (総特集 海洋物質循環と地球環境) -- (7章 海洋物質循環のモデリング)
山中 康裕, 号外海洋, 11, 156, 163, Sep. 1996
資料形態 : テキストデータ プレーンテキスト, 海洋出版, Japanese

海洋における人為起源物質の濃度分布のモデルによる再現 (特集 西太平洋の海洋環境)
山中 康裕; 阿部 彩子, 海洋, 28, 8, 510, 515, Aug. 1996
資料形態 : テキストデータ プレーンテキスト, 海洋出版, Japanese

Marine biogeochemical cycles and paleoceanography
Yamanaka Yasuhiro, Tenki, 43, 7, 476, 482, 31 Jul. 1996
社団法人日本気象学会, Japanese

8) Climate Modelling in Geological scale
Abe-Ouchi Ayako; Yamanaka Yasuhiro, 日本地質学会学術大会講演要旨, 103, 0, 25, 25, 20 Mar. 1996
日本地質学会, Japanese

MODELING OF OCEANIC CARBON CYCLE
YAMANAKA Yasuhiro; TAJIKA Eiichi, Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 9, 194, 194, Sep. 1995
We develop an ocean general circulation model which includes biogeochemical processes (biogeochemical general circulation model, B-GCM). B-GCM can deal not only with current field, temperature, and salinity, but also with biogeochemical tracers such as phosphate, dissolved oxygen, alkalinity, total CO_2,δ^<13>C, and Δ^<14>C. Here, we show results of three case-studies. First, our model is driven by the wind stress, sea surface temperature, and sea surface salinity (SSS) under the present annual mean condition. The steady state obtained in our model well reproduces the following principal observed features : The phosphate concentration and the Δ^<14>C value increase along the flow path of the deep circulation from the North Atlantic to the North Pacific. The oxygen concentration and the δ^<13>C value decreases along the deep circulation path. Phosphate maximum and oxygen minimum are at about 1km depth, and the lysocline lies above the depth of 1km in the North Pacific. Second, our model is driven under the same condition as the first experiment except that the SSS condition in the North Atlantic is reduced by 3 psu from the present state. In this case, a weak and less saline intermediate water (North Atlantic Intermediate Water, NAIW) forms at about 1km depth instead of forming North Atlantic Deep Water (NADW). The deep water under the depth of 1km is stagnant (very weak Antarctic Bottom Water), which supports the hypothesis suggested from the Cd/Ca ratio (E.A. BOYLE; Nature, 331,55,1988). The lysocline in the North Atlantic lies at about 1km depth, which also partially supports Boyle's alkalinity hypothesis. Last, transient states are calculated with alternating the flow fields in the previous two cases (we call these transition 1 : NADW on⟶off or transition 2 : NADW off→on). The following three stages are found : (1) gas exchange between the atmosphere and the sea surface layer within 1-30 years, (2) water exchange between the surface and deep layer in the Atlantic within 100-1000 years, (3) water exchange between the Atlantic and the Pacific within 1000-3000 years. The time scale of the second stage for transition 1 is 100-400 years, which is faster than the 200-1000 years for transition 2. The atmospheric CO_2 overshoots in the second stage. For example, for transition 2,the atmospheric CO_2 rapidly increases in the first stage, overshoots in the second stage, and slowly/slightly decreases in the third stage., National Institute of Polar Research, English

DEVELOPMENT OF A COUPLED ICE-OCEAN GENERAL CIRCULATION MODEL
HASUMI Hiroyasu; YAMANAKA Yasuhiro, Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology, 9, 197, 197, Sep. 1995
A three dimensional ice-ocean coupled model has been developed, and some basic experiments for examining effects of ice cover on ocean circulation are done using the model. Our ice model is based on the two-dimensional dynamic model of W.D. HIBLER, III (J. Phys. Oceanogr., 19,815,1979) and the one-dimensional thermodynamic model of G. L. MELLOR and L. H. KANTHA (J. Geophys. Res., 94,10936,1989). The variables predicted or diagnosed are ice concentration, ice thickness, horizontal ice velocity, and temperature at the upper and lower surfaces of the ice and in the middle of the ice layer. We use the beta-plane version of the ocean general circulation model developed at Center for Climate System Research. The level 2 closure scheme of G. L. MELLOR and T. YAMADA (Rev. Geophys. Space Phys., 20,851,1982) is included in the upper layer of the ocean model to represent the sea surface mixed-layer. Numerical experiments are performed under idealized basin geometry and surface boundary conditions. We consider a rectangular ocean in the northern hemisphere with the equator as the southern boundary. Boundary conditions at the sea surface are derived from prescribed surface air temperature, relative humidity, and wind velocity and shortwave and longwave radiation. All the forcings except the winds have seasonal variations. Precipitation and evaporation as water flux forcing is not considered (zero everywhere). Salinity flux at the sea surface is taken to be nonzero only when and where sea ice forms or melts. Four cases under the same sea surface conditions are calculated, i.e., cases where ice motion is included or not, and cases where salinity rejection from ice is included or not. These case-studies suggest that the thermohaline circulation is heavily affected by the coupling of ice motion and salinity rejection. With ice motion included, ice drifts away from the formation region. With both salinity rejection and ice motion included, ice formation and consequent salinity rejection is quite active in the formation region. Thus ice cover strengthens the horizontal density gradient and enhances the thermohaline circulation., National Institute of Polar Research, English

海洋生物化学大循環モデルによる炭素循環の研究(その4)
山中 康裕; 田近 英一, 大会講演予講集, 67, 0, 325, 325, 15 May 1995
Japanese

どのような気候状態が存在するか?-シンプルモデルを用いた研究例-
山中康裕, 月刊地球, 17, 265, 268, 1995

M3:Global Climate Models
Sumi Akimasa; Numaguti Atsushi; Ose Tomoaki; Yamanaka Yasuhiro; Tokioka Tatsushi, Tenki, 40, 0, 991, 997, 31 Mar. 1994
社団法人日本気象学会, Japanese

海洋炭素循環に対するモデリング-海洋中の物質分布を再現する試み-
山中康裕, 月刊海洋, 184, 191, 1994

北海道から見る地球温暖化
岩波書店, 2008

台風による亜熱帯海洋の基礎生産への影響評価
柴野良太; 山中康裕; 岡田直資; 中田隆; 鈴木真一; 新野宏; 虎谷充浩
日本海洋学会大会講演要旨集, 01 Sep. 2012, Japanese

P323 降雪結晶が原因となる表層雪崩弱層形成のモデル化(ポスター・セッション)
中村 一樹; 藤吉 康志; 佐藤 友徳; 平島 寛行; 山口 悟; 西村 浩一; 山中 康裕
大会講演予講集, 2012, Japanese

Estimation of snow structure with climate change in Hokkaido by SNOWPACK model
Kazuki Nakamura; Tomonori Sato; Yasuhiro Yamanaka; Kouichi Nishimura
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 01 Jan. 2011

B368 新たな観光資源「トマムの雲海」を通じた産学連携の学びの実践 : トマム雲海仙人の雲修行(スペシャル・セッション「気象情報・知識の伝達・普及(II)」,口頭発表)
中村 一樹; 佐藤 祐介; 吉村 暢彦; 森 佳祐; 久保 拓士; 渡邊 恵実; 田沼 大和; 山中 康裕; 藤吉 康志; 鈴木 和仁; 橋本 亮一; 星 宏聡; 今野 裕次郎; 田中 大介; 今里 舞; 山岸 奈津子; 近藤 真弘
大会講演予講集, 30 Sep. 2010, 社団法人日本気象学会, Japanese
30 Sep. 2010 - 30 Sep. 2010

海洋低次生態系モデルの改良と経年変動実験
須股浩; 奥西武; 橋岡豪人; 橋岡豪人; 岡田直資; 重光雅仁; 坂本天; 鈴木立郎; 山中康裕; 山中康裕; 山中康裕
日本海洋学会大会講演要旨集, 15 Mar. 2010, Japanese
15 Mar. 2010 - 15 Mar. 2010

地球温暖化に伴う水温上昇がサンゴ分布の北限に及ぼす影響評価とその不確実性
屋良由美子; 藤井賢彦; 山中康裕; 岡田直資; 山野博哉; 大島和裕
日本海洋学会大会講演要旨集, 11 Sep. 2009, Japanese
11 Sep. 2009 - 11 Sep. 2009

地球温暖化に伴う水温上昇がサンゴ分布に及ぼす影響評価
屋良由美子; 藤井賢彦; 山中康裕; 岡田直資; 山野博哉; 大島和裕
日本海洋学会大会講演要旨集, 23 Mar. 2009, Japanese
23 Mar. 2009 - 23 Mar. 2009

渦許容全球モデルによる低次生態系の経年変動実験
須股浩; 須股浩; 橋岡豪人; 橋岡豪人; 岡田直資; 岡田直資; 相田真希; 吉江直樹; 坂本天; 鈴木立郎; 鈴木立郎; 山中康裕; 山中康裕; 山中康裕; 山中康裕
日本海洋学会大会講演要旨集, 23 Mar. 2009, Japanese
23 Mar. 2009 - 23 Mar. 2009

生態系モデルeNEMUROによる日本周辺五海域の低次生態系群集構造の再現
吉江直樹; 伊藤進一; 小松幸生; 奥西武; 小埜恒夫; 田所和明; 日高清隆; 長谷川徹; 齊藤宏明; 山中康裕
日本海洋学会大会講演要旨集, 23 Mar. 2009, Japanese
23 Mar. 2009 - 23 Mar. 2009

海洋沈降粒子中の有機炭素安定同位体比の季節変動要因解析
重光雅仁; 山中康裕; 山中康裕; 山中康裕; 渡辺豊; 岡田直資; 前田亘宏; 乗木新一郎
日本地球化学会年会講演要旨集, 2009, GEOCHEMICAL SOCIETY OF JAPAN, Japanese
2009 - 2009, We collected settling particles by time-series sediment trap deployed at station KNOT (44°N 155°E, trap depth 770m) from 25 October 1999 to 20 June 2001, and from 25 June 2002 to 11 May 2006, and measured particulate organic carbon content and its carbon isotopic ratio (δ13C-POC) for each sample. δ13C-POC generally showed the trend that minima occur in spring, and maxima occur in fall. The range of the values was from about -27.0 to -23.00/00. To interpret the mechanisms controlling such variations quantitatively, we developed a one-dimensional ecosystem model including carbon isotopes. In our model, we considered the isotope effects by photosynthesis, degradation of particulate organic carbon, precipitation of calcite and gas exchange. This model successfully reproduced the seasonal variations in dissolved inorganic carbon (DIC) concentration, δ13C of DIC in the surface water, and δ13C-POC. We analyzed the mechanisms controlling δ13C-POC in our model results.

A309 海洋の物理的変化が及ぼす大気二酸化炭素濃度への影響 : 氷期-間氷期サイクル(気候システムIII)
倉橋 貴純; 阿部 彩子; 山中 康裕
大会講演予講集, 30 Apr. 2008, 社団法人日本気象学会, Japanese
30 Apr. 2008 - 30 Apr. 2008

台風に対する海洋生態系の応答
柴野良太; 山中康裕; 山中康裕; 山中康裕; 岡田直資; 岡田直資; 中田隆; 鈴木真一; 新野宏
日本海洋学会大会講演要旨集, 2008
2008 - 2008

S2-2 Studies of global warming(Symposium II Climate change and microbial ecology)
Yamanaka Yasuhiro
日本微生物生態学会講演要旨集, 15 Sep. 2007, 日本微生物生態学会, Japanese
15 Sep. 2007 - 15 Sep. 2007

S-110 Response of marine biogeochemical cycles to massive volcanic activities : implications for cause of Ocean Anoxic Events
Misumi Kazuhiro; Yamanaka Yasuhiro; Tajika Eiichi
日本地質学会学術大会講演要旨, 01 Sep. 2007, 日本地質学会, Japanese
01 Sep. 2007 - 01 Sep. 2007

Decomposition of sinking particulate nitrogen in the twilight zone in the western subarctic Pacific and its influence on the nitrogen isotopic ratio
Shigemitsu Masahito; Watanabe Yutaka; Yamanaka Yasuhiro; Honda Makio
Abstracts of Annual Meeting of the Geochemical Society of Japan, 2007, GEOCHEMICAL SOCIETY OF JAPAN
2007 - 2007, The objective of this research is to obtain the knowledge about decomposition of sinking particulate nitrogen in the twilight zone ( depths below the euphotic zone to 1000m) in the western subarctic Pacific and its influence on the nitrogen isotopic ratio. Samples were collected from March 20th, 2005 to September 18th, 2005 at 150m, 540m and 1000m water depth using time series sediment trap system. First, the simple settling model which could reconstruct the fluxes of settling particles at 540m and 1000m using the settling particle fluxes at 150m as initial values, was developed. In this model, following assumptions were made: 1) Total components sink simultaneously as same aggregates. 2) Organic materials, Calcium Carbonate and Opal in main components of sinking particles decompose in settling process. 3) Particle settling rates increase with depth. 4) Ballast minerals (Calcium Carbonate, Opal and Lithogenic materials) have constant organic matters that are protected from remineralization. We will report the results of analyzing the above objective based on this model.

2006A-OS3-8 Simulation of transport and dilution of the injected CO_2 in the North Pacific
Masuda Yoshio; Yamanaka Yasuhiro; Sasai Yoshikazu
Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers, Nov. 2006, 社団法人日本船舶海洋工学会, Japanese
Nov. 2006 - Nov. 2006

O-9 A simulation of Ocean Anoxic Events in the mid-Cretaceous
Misumi Kazuhiro; Yamanaka Yasuhiro
日本地質学会学術大会講演要旨, 08 Sep. 2006, 日本地質学会, Japanese
08 Sep. 2006 - 08 Sep. 2006

A simulation of Ocean Anoxic Event in the mid-Cretaceous
Misumi Kazuhiro; Yamanaka Yasuhiro
日本地質学会学術大会講演要旨, 10 Sep. 2005, 日本地質学会, Japanese
10 Sep. 2005 - 10 Sep. 2005

大気の総観規模擾乱が海洋生態系に及ぼす影響
藤井 賢彦; 山中 康裕
大会講演予講集, May 2002, Japanese
May 2002 - May 2002

環境起学基礎演習, 2024年, 修士課程, 環境科学院

環境起学特別講義Ⅰ, 2024年, 修士課程, 環境科学院

大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目

大学院共通授業科目（一般科目）：複合領域, 2024年, 修士課程, 大学院共通科目

大学院共通授業科目（一般科目）：複合領域, 2024年, 修士課程, 大学院共通科目

実践環境科学実習Ⅱ, 2024年, 修士課程, 環境科学院

実践環境科学演習Ⅰ, 2024年, 修士課程, 環境科学院

実践環境科学特論, 2024年, 修士課程, 環境科学院

実践環境科学総論Ⅰ, 2024年, 修士課程, 環境科学院

実践環境科学総論Ⅱ, 2024年, 修士課程, 環境科学院

実践環境科学ｲﾝﾀｰﾝｼｯﾌﾟⅠ, 2024年, 修士課程, 環境科学院

実践環境科学ｲﾝﾀｰﾝｼｯﾌﾟⅡ, 2024年, 修士課程, 環境科学院

実践環境科学実習Ⅰ, 2024年, 修士課程, 環境科学院

環境科学総論, 2024年, 修士課程, 環境科学院

実践環境科学演習Ⅱ, 2024年, 修士課程, 環境科学院

環境と人間, 2024年, 学士課程, 全学教育

Aug. 2022 - Present
移民政策学会

Sep. 2019 - Present
日本地域政策学会

Aug. 2019 - Present
日本地域福祉学会

Jan. 2018 - Present
JAPAN CURRICULUM RESEARCH AND DEVELOPMENT ASSOCIATION

Jun. 2017 - Present
Development Education Association and Resource Center

Nov. 2015 - Present
環境科学会

Aug. 2012 - Present
地球環境史学会

Jun. 2010 - Present
THE JAPANESE SOCIETY FOR ENVIRONMENTAL EDUCATION

Apr. 1998 - Present
JAPAN GEOSCIENCE UNION

Apr. 1989 - Present
the Meteorological Society of Japan

Apr. 1989 - Present
THE OCEANOGRAPHIC SOCIETY OF JAPAN

Jan. 1991 - Mar. 2018
THE GEOCHEMICAL SOCIETY OF JAPAN

豪雪地帯小樽市の小地域別の要援護者の買い物・通院の移動支援に関する研究
科学研究費助成事業
01 Apr. 2025 - 31 Mar. 2028
岡田 直人; 山中 康裕; 中村 一樹; 吉村 暢彦
日本学術振興会, 基盤研究(C), 北星学園大学, 25K05568

Research on the possibilities and challenges of climate democracy in Japan
Grants-in-Aid for Scientific Research
01 Apr. 2023 - 31 Mar. 2027
三上 直之; 江守 正多; 竹内 彩乃; 田村 哲樹; 茅野 恒秀; 八木 絵香; 松浦 正浩; 工藤 充; 山中 康裕; 松橋 啓介; 前田 洋枝; 吉田 徹; 尾内 隆之; 長野 基; 坂井 亮太; 西山 渓; 青木 聡子; 寺林 暁良
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 23H00526

Development of teaching materials and educational programs for numerical simulations to understand climate change
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
01 Apr. 2021 - 31 Mar. 2025
福原 朗子; 山中 康裕
本研究の目的は、高校で習う知識に基づいて、気候変動の将来予測等の数値シミュレーションの基礎を学ぶ教材および教育プログラムを開発することである。時間発展方程式を解く数値シミュレーションは、1960年代、1970年代の最先端の研究ツールだったが、今では高校生で扱える素材となりうる。本研究では、気候変動の本質を理解する、高校生自らが表計算ソフトを用いて時間発展方程式を解く、教材および教育プログラムを開発する。授業評価を通じて、高校生が「物理基礎」、「数学I」、「情報」等の科目で学ぶ知識に基づいて、どの程度の数値シミュレーションが行えるか？『世の中の様々な現象が、「数学II」で学ぶ初等関数や微分積分で説明できる』ことを、数値シミュレーションを用いてどの程度理解できるか？を明らかにする。
2021年度の研究実績の概要は、時間発展方程式で用いるデータの収集、表計算ソフトを使用した試行、グラフによる視覚化をおこなった。特に物理基礎に関する題材の実験を行った。また、プログラム内で使用する光音響効果実験装置の取り扱いに関する動画撮影を行い、編集を行った。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University of Science, 21K02886

社会の負託に対する研究者の認識と説明責任：地球科学における事例研究
科学研究費助成事業 挑戦的研究(萌芽)
09 Jul. 2021 - 31 Mar. 2024
山中 康裕
2021年12月に開催された米国地球物理学連合(AGU) Fall Meetingにおいて、研究協力者である島村と末廣、および、AGU副会長Hansonをコンビナーとしてユニオンセッション「知の創造の価値とは何か？研究評価の理想と現実」がオンライン実施され、研究代表者山中が日本地球惑星科学連合(JpGU)と米国地球物理学連合(AGU)に所属する研究者の研究に対する認識を比較した招待講演を行った。この点においては、おおむね順調に研究計画の進展があった。このことなどを通じて、資金配分機関等の研究者を取り巻く状況、例えば「研究者の研究費獲得」と「研究者の社会に対する説明責任」に関する理解が進んだ。
しかし、本研究の中核となる、世界中の研究者から「研究者の社会に対する説明責任」について、AGU Fall Meetingがオンライン実施されたため、本来実施したかった対面による聞き取り調査が出来なかった。研究協力者のもとで、研究課題「地球科学における研究評価の国際チューニング：地の文化と指標の創造」と本課題をあわせると4回のユニオンセッションをJpGUかAGUで実施し、その機会にアンケートや聞き取り調査を行ってきたが、それらを実施することが難しくなった。また、2020年5月に行われた欧州地球科学連合(EGU)、AGU、JpGU等の共同宣言に対する認識を明らかにしたこれまでのアンケート分析にもとづいて、研究者の認識を問うことにしていたが、共同宣言やアンケートからの1年以上経ち、コロナ禍のもとで、その過程を踏まえた聞き取り調査の速やかな実施が難しくなった。
日本学術振興会, 挑戦的研究(萌芽), 北海道大学, 21K18473

海洋植物プランクトンに関する形質空間の概念確立と気候変動に伴う将来予測
科学研究費助成事業 基盤研究(A)
01 Apr. 2018 - 31 Mar. 2023
山中 康裕; 平田 貴文
植物プランクトンの共存についての成果を論文化し、Ocean Modelling誌に受理された。この論文ではハッチンソンパラドックスに対して、ニッチの殆ど重なった類似種をモデル内で競争させ、共存出来るケースがあることを明らかにした。従来の数理生態学によるアプローチでは海洋環境の多様性、海流による植物プランクトンの分散が殆ど考慮されていなかったが、これらが共存を可能にしていることが分かった。更に、最新の植物プランクトン生理理論をモデルに取り入れ、世界で初めて亜表層クロロフィル極大の全球分布パターンの再現に成功した。植物プランクトンは環境に馴化して細胞内クロロフィル含有量を10倍以上変化させており、この馴化によって亜表層クロロフィル極大深度の海域による違いを説明できることを国際学術誌に投稿し、現在査読コメントを受けて改稿したところである。
モデル実験については、156種の植物プランクトンが競争する次世代多様性モデルを開発し、現在気候下での再現実験を行った。モデルで再現された分布を衛星で推定された植物プランクトン分類群（マイクロ、ナノ、ピコプランクトン）の分布を比較し、両者間で非負重回帰分析を行なった結果、マイクロプランクトンやピコプランクトンに比べ、ナノプランクトンは多様な生理パラメータを持つ特徴があることが示された。特に、中位の温度帯における多様性が高いことが示唆された。さらに、モデルと衛星の比較結果から各群集の形質のひとつである細胞サイズを全球規模で推定したところ、マイクロプランクトンは16.3、ナノプランクトンは7.3、ピコプランクトンは4.2μmと推定され、既存の知見をよく表現していることを確認した。特にマイクロプランクトンは、解析した1998年から2004年の期間に、細胞サイズが減少傾向にあることがわかった。
日本学術振興会, 基盤研究(A), 北海道大学, 18H04130

International tuning of research assessment in Geosciences: Creating culture and indicators of scientific knowledge
Grants-in-Aid for Scientific Research
28 Jun. 2019 - 31 Mar. 2022
Yamanaka Yasuhiro
In this study, we surveyed members of the Japan Geoscience Union (JpGU) and the American Geophysical Union (AGU) on "What is the value of knowledge creation?" to understand their research activities and to identify commonalities and differences in the perceptions of their respective research communities. Differences were found in that AGU members were more conscious of "giving back to society" than JpGU members (especially young researchers). A total of four union sessions were held at the JpGU and AGU annual meetings, asking the earth science community, "What is the value of knowledge creation? These results were published in the Newsletter of the Japan Geoscience Union (JGL) and at DSIR 2021, an international conference on institutional research.
Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Exploratory), Hokkaido University, 19K21735

植物プランクトン群集の多様性に注目したナウキャスト技術開発
2011 - 2016
山中 康裕
本研究は、西部北太平洋域における海洋生態系の根幹である植物プランクトン群集を研究対象として、その多様性の現況を把握するために(1)数値モデリング、(2)人工衛星を用いた地球観測、(3)海洋での現場観測を用いて、植物プランクトン群集の多様性の形成・維持・消滅機構を解明します。そして、人工衛星から得られる物理環境や植物プランクトン群集を海洋生態系モデルに同化させることでナウキャスト(現況予測)の基盤技術を開発し、生物多様性保全や水産資源変動予測等に貢献することを目指します。
科学技術振興機構, 戦略的な研究開発の推進/戦略的創造研究推進事業/CREST, 11103777

Correlation analysis between phytoplankton functional types and the ocean partial pressure of carbon dioxide using the satellite ocean colour observation and marine ecosystem modelling.
Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up
2010 - 2011
HIRATA Takafumi; YAMANAKA Yasuhiro; FUJII Masahiko
Time series of partial pressure of carbon dioxide and phytoplankton functional types(PFTs) were reconstructed from the existing ocean colour data. Temporal anomaly of pCO_2 and fractional Chlorophyll-a(Chla) of each PFT showed a significant negative correlation around the sub-arctic or sub-tropical frontal zones, which was also found from the hindcast simulations of a marine ecosystem model. On the other hand, correlation between pCO_2 and a relative contribution of each PFT to the total Chla showed a taxonomic dependence in the frontal zones : the large-and middle-sized algae such as diatoms and haptophytes showed a negative correlation with pCO_2 whereas the small-sized algae a positive correlation. These results imply that phytoplankton community structure, as well as their biomass, may play an important role on variation in pCO_2 for some oceanic regions.
Japan Society for the Promotion of Science, Grant-in-Aid for Research Activity Start-up, Hokkaido University, 22810001

海洋生態系将来予測のための海洋環境シミュレーション研究
2006 - 2011
山中 康裕
地球温暖化や海洋酸性化による海洋生態系や水産資源への影響などの将来予測のために、海洋環境シミュレーション研究を行います。人間活動に伴い放出されたCO2は、大気中CO2濃度を上昇させ地球温暖化を引き起こすとともに、海洋によって吸収され海洋酸性化を引き起こし、海洋生態系などに影響を与えると予想されています。その基盤技術となる海洋科学の各分野でのモデルを統合した海洋環境シミュレーション技術を開発します。
科学技術振興機構, 戦略的な研究開発の推進/戦略的創造研究推進事業/CREST, 07051022

Responses of marine ecosystem to weather disturbances of synoptic scale
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas
2006 - 2010
YAMANAKA Yasuhiro; ONIZUKA Goh; AITA N.Maki
In the western subtropical North Pacific, we investigated the response of phytoplankton to typhoon passage using a numerical model. We found the observed patch-like phytoplankton bloom was reproduced for slow-moving typhoons. The strong bloom is caused by the typhoon-centered upwelling of nutrient-rich water from below the euphotic layer, which supplies the nutrients required for phytoplankton growth, resulting in higher chl-a concentrations. Biogeochemical processes then play essential roles in determining the response after the passage of typhoons in subtropical regions, by comparing experiments with/without biogeochemical processes in the model.
We also improvement a marine ecosystem model introducing iron cycle with iron supplies by the atmospheric dust transport and remineralization on the continental shelf etc. This improved surface distribution of nutrient and chlorophyll-a concentrations on the global scale, especially in the high nutrient and low chlorophyll-a regions such as the subarctic North Pacific due to biological production limited by iron concentration.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Priority Areas, Hokkaido University, 18067004

Linkages in Biogeochemical Cycles Between Surface Ocean and Lower Atmosphere
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas
2006 - 2010
UEMATSU Mitsuo; YOKOUCHI Yoko; WATANABE Yutaka; TAKEDA Shigenobu; YAMANAKA Yasuhiro; TSUDA Atsushi
The general management group (X00) of the W-PASS project coordinated to clarify the scientific direction of the four research divisions. The X00 group planned and proposed the intensive island observation campaigns and research cruises. Annual plenary meeting for all project members, meetings for principle investigators and advisory committee members were periodically held and discussed how to manage the project activities. The four working groups (WGs) were established to collaborate among the activities of four divisions (i.e., WG for intensive atmospheric observation campaign at Hedo Cape, WG for evaluation of typhoon impacts, WG for long term variability of marine ecosystems, and WG for eddy covariance technique). It functioned quite well to make vivid discussions and to find new approaches for our goals. Over 20 sessions and workshops were organized for presenting our scientific accomplishments during the national and international symposium and society meetings. Young scientists and students to present their study in abroad were encouraged and supported to cover their travel expenses. To this end, 12 grad students earned their PhD degrees under this project. Newsletters were annually published and the W-PASS webpage was popular to the community.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Priority Areas, The University of Tokyo, 18067009

Investigating the Mechanism of Glacial Interglacial cycle using a series of model in hierarchy
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
2004 - 2006
ABE Ayako; HASUMI Hiroyasu; SAITO Fuyuki; YOKOYAMA Yusuke; YAMANAKA Yasuhiro; TANIMOTO Youichi
One of the challenges of earth system modeling is to explain the mechanism of ice age cycle by simulating it and to understand the uniqueness or necessity of the present state of climate and cryosphere. Whether Milankovitch cycle or CO2 is the driver and why the dominant periodicity of ice age cycle switched from 40 ka cycle to 100ka cycle have been remained unsolved. Many conceptual models as well as EMICs have been used to study the transient behaviors, while the GCM was used to study the balance of “snapshot" climate such as LGM, mid-Holocene and last interglacial. Here we simulate the glacial cycles and investigate the origin of saw-tooth shape 100ka cycle using a three dimensional ice sheet model with the input examined by GCM. The model is forced by the orbital parameters (Berger, 1978) and atmospheric CO2 content obtained by ice cores (Vostok, EPICA and DomeF), whose dating is partly given by a new method using the N2/ao2 ratio. The ice sheet model includes the thermo-mechanical coupling process of ice sheet with the process of delayed isostatic rebound with a typical time constant. In order to estimate the climate sensitivity to Milankovitch forcing and atmospheric CO2 indicated by ice core data we used an atmospheric GCM (part of MIROC GCM) coupled to a slab ocean. Within the range of possibilities of the model, ice age cycles with a saw-tooth shape 100ka cycle, the major NH ice sheets' volume and the geographical distribution at the glacial maximum are successfully simulated. The role of the delayed response of Viscoelastic earth mantle-crust system is examined to confirm the work of Crufix et al, 2001. Moreover the role of Atmospheric stationary wave feedback are found to be important to sharpen the termination. It is shown by sensitivity studies that this 100ka cycle is mainly obtained by the slowly acting ice sheet response to Milankovitch forcing even without the CO2 cycle. The CO2 change amplifies the cycle and affects the global climate change, while the delay of crustal rebound sharpens the termination of every ice age cycle. Concerning the switch from 40ka cycle to 100 ka cycle, mean CO2 decrease is shown to be important for the response of the system to the Milankovtich cycle in this model.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), The University of Tokyo, 16340136

Modeling of global biogeochemical cycles explicitly representing marine ecosystem
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
2003 - 2005
YAMANAKA Yasuhiro; KISHI Michio
We developed a marine ecosystem model including nine groups of plankton explicitly representing subarctic and subtropical species, and simulated the observed seasonal changes. We found that the seasonal change in sea surface temperature brings about symbiosis of both subarctic and subtropical species at a specific site. In other words, the seasonal change adapts a specific species to environments from subarctic to subtropical regions. At typical two sites, A7 in the subarctic and B1 in the subtropical regions, our model well simulated the observed seasonal changes of group biomasses for phytoplankton and zooplankton.
Hindcast experiment from 1948 to 2002 simulated by our 3-D global ecosystem model, including five groups, successfully reproduced the regime shift of primary production and zooplankton biomass in 1970s, and also simulated group shifts between large and small zooplankton and partial pressure of carbon dioxide associated with interannual variations.
Simulation by a 3-D regional ecosystem model showed that major phytoplankton is determined by nutrient dependency of photosynthesis in the subtropical region and by grazing preference of copepods in the subarctic regions. Based on the global warming simulation conducted by Center for Climate System Research in Tokyo University and National Institute for Environmental Studies, we studied an impact of global warming on marine ecosystem at the end of this century. We found an impact of global warming does not uniformly occur but occurs in the specific region, the mixed water region, between the subarctic and subtropical regions. Especially, large reduction of primary production and major group at the second half of the spring bloom, growth season of small pelagic fish, are caused by global warming. This study tells us that global warming will bring about large reduction of fish resource.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 15510001

海洋・大気間の物質相互作用研究計画(IGBP/SOLAS)の準備調査
科学研究費助成事業 基盤研究(C)
2004 - 2004
植松 光夫; 梶井 克純; 津田 敦; 渡辺 豊; 武田 重信; 山中 康裕
本研究では、海洋・大気間の物質相互作用研究計画(IGBP/SOLAS)の特定領域研究申請に向けて、各プロジェクトの具体的な共同研究体制や戦略、国際的な協力体制を確立するため、国内研究立案集会を2004年7月1-2日に東大海洋研にて開催した。
その後、10月6日にDMS関係のデータ、情報交換を含めたSOLAS-Japan DMSワークショップを開催した。ワークショップ終了後、"Dr.Sauveur BELVISO(CEN de Saclay, France)とDr.Dileep KUMAR(National Institute of Oceanography, India)を招待して、それぞれ"Recent progresses of DMS biogeochemistry in the Southern Ocean"と"Dimethylsulphide in the monsoon driven Indian Ocean"というタイトルでセミナーを開催した。
11月15-16日には東大海洋研において「大気・海洋間の生物地球化学的循環過程」について国内SOLASシンポジウムを開催し、30件を越える成果と研究提案の発表があった。
2005年1月20-21日に名古屋大においてSOLAS-Japanワークショップを開催し、来年度の研究計画や長期の航海計画申請について意見を集約した。
国際的な活動として、ノルウェーのベルゲンで開催された国際SOLAS SSC meetingに植松(SSC委員)と武田(SSC委員)が出席し、日本を中心としたアジア域での取り組みについて取りまとめた。2005年には東京で国際SOLAS SSC meetingを開催することに決まった。また、この東京会議に引き続いてAsia SOLAS Workshopの開催を計画した。
2004年10月にカナダ、ハリファックスで開催される国際SOLASシンポジウムに我が国から15名の研究者が発表した。津田がキーノートスピーカーとして招待された。本研究費から4名の発表者に旅費の援助を行った。
この間、特定領域研究申請に向けて作業を行い、2004年11月に「海洋表層・大気下層間の物質循環リンケージ」(大気海洋物質循環)を申請した。
日本学術振興会, 基盤研究(C), 東京大学, 16631003

海洋による二酸化炭素吸収について地域分布および季節変化の再現と解明
科学研究費助成事業
2000 - 2000
山中 康裕
現在の3次元の海洋物質循環モデルは、海洋による人為起源二酸化炭素の吸収の見積もりをIPCCレポートに提供しているように、広く用いられている。しかし、このモデルで季節変動を再現を試みようとすると、春季ブルームなどが再現できないといった亜寒帯域において問題を生じる。従って、海洋生態系を陽に表現したモデルの開発が不可欠であり、本研究では3次元の海洋物質循環モデルに組み込むための生態系モデルを開発した。本研究以前の生態系モデルは、海洋有光層中の硝酸塩やアンモニア濃度が生物生産を決めているため窒素循環のみを扱ってきたが、本研究では、炭素循環を表現するために、炭素循環とともに炭酸カルシウムの殻なども扱うようにした。すなわち、15コンパートメント、栄養塩として、アンモニアや硝酸塩、珪酸塩、プランクトンとして、大型や小型植物プランクトン、大型や小型、高次補食動物プランクトン、溶存有機物、沈降粒子として、粒子状有機物や炭酸カルシウム、オパール、さらに全炭酸や全アルカリを表現し二酸化炭素分圧を計算できるようにした。
このモデルを1987年から現在まで北海道地区水産研究所が年5,6回航海を行っているA-Line上のA-7(41.5N,45.5E)に適用した。二酸化炭素分圧は、冬季混合に伴って最高となり、春季ブルームの期間急速に減少し、夏から秋にかけて、水温上昇による分圧上昇と生物生産による分圧減少が相殺して、ほぼ一定となる。このように、ほぼ現実的な二酸化炭素分圧の季節変動を再現することができた。これらの結果を3編の論文として現在投稿中である。
日本学術振興会, 特定領域研究(A), 北海道大学, 12018201

Studies on Continental Hydrological Cycle Using Water Isotope Global Circulation Model
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
1999 - 2000
NUMAGUTI Atusi; ABE Ayako; TSUJIMURA Maki; SUGIMOTO Atsuko; YAMANAKA Yasuhiro; YAMAZAKI Koji
A Water Isotope Global Circulation Model (WI-GCM) is developed based on CCSR/NIES Atmospheric General Circulation Model (AGCM) including global circulation of oxygen and hydrogen isotope with revised treatment of mixed-phase cloud, evaporation of precipitating drop, and evaporation from ocean. The simulated isotope ratio is found to be consistent with the results of GNIP observations. Further, thenumerical scheme of transport of water in the atmosphere is replaced by newly developed grid-base advection scheme with flux-form semi-Lagrangean treatment. It is found that this replacement of transport scheme improves not only the hydrological cycle of polar region but also the simulation of isotope ratio.
Comparing the model results with observed isotope ratio in precipitation in Tibet, Siberia, and other regions, some utility of isotope for the study of mechanisms and variability of the hydrological cycle. In Tibet, an importance of water vapor which is originated from evaporation of precipitating drop from convective cloud is suggested. In Siberia, interannual variation of recycling process between land and atmosphere is suggested by observed interannual variation of isotope. In Antarctica, an interannualvariation of isotope ratio related with the interannual change of transport route connected with ENSO variation is identified.
Comparing the observed water isotope ratio in the soil and plant with model results it is suggested that the improved treatment of soil water and fractionation by evaporation from land surface is important future study.
It is concluded that we have succeeded in building a useful tool for the quantitative studies on hydrological cycle by using water isotope.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), HOKKAIDO UNIVERSITY, 11640426

海洋による二酸化炭素の全球規模の吸収および放出の地域分布の再現と解明
科学研究費助成事業 特定領域研究(A)
1999 - 1999
山中 康裕
東大気候システム研究センターで開発された海洋生物化学大循環モデルを国際炭素循環モデル相互比較プロジェクト用に変更したものを用いて研究を行った。現在、そのプロトコルに従って、生物過程(生物ポンプ)が入っていないモデルの計算は終了し、生物過程も含むモデルで計算中である。今のところ、季節変化を含む深層まで平衡状態になった物理場(温度・塩分分布および流速場)を求めることは、非常に計算資源を必要とするため、本年度は季節変化が入っていない年平均状態を計算しているが、現在、季節変化が入った平衡状態も、同時変更して計算を行っているため、次年度以降利用可能となる予定である。
具体的には、まず、平衡状態を求めるため、大気中二酸化炭素濃度を278ppmに固定して、海洋物質循環モデルを約12,000年計算を行い深層を含めて、平衡状態を得る。この次に、西暦1760年から1990年まで観測された大気中二酸化炭素濃度を与えることで、人為起源二酸化炭素がどのように分布するかを計算する(Historical実験)。その後IPCCレポートの2つのシナリオIS92aおよびS550に基づいて計算する(IS92a実験およびS550実験)。これらの結果は、OCMIPとして次のIPCCレポートに取り入れられる予定である。また、ベルン大学のF.Joosの提案で、瞬間的に大気中二酸化炭素濃度を2倍にして、大気海洋間の二酸化炭素の全量を保存するよう計算する実験(pulse実験)も行った。
なお、一連の実験結果は、ホームページ上に公開することを目指しているが、どのように公開するかは、ただいま試行中である。
日本学術振興会, 特定領域研究(A), 北海道大学, 11131201

Understanding of the Earth's system by modeling
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas
1995 - 1997
SENO Tetsuzo; YAMANAKA Yasuhiro; HONDA Satoru; OGAWA Masaki; ITO Keisuke; ABE Ayako
Earth is a complex system where surface and interior layers interact. We investigate this interaction from the viewpoint of outputs from forcing such as internal and external forcing. The internal forcing is the mantle and core activities, and the external forcing is the temporal variation of the solar radiation. In the Earth's history mantle activities cause crustal evolution, global sea level change, Wilson cycles, flushing events, and plumes with time scales of 1-0.1 Gy. This causes environmental changes such as changes of the continent distribution and continent area above sea level. Climate change is then studied as a response of environments different from the present one to the solar radiation and Milankovitch cycles.
We elucidated the temporal change of the mantle convection. During 4-2 Ga, thick residual material from extensive melting covered the Earth's surface and episodic avalanche occurred due to boundary layer instabilities. During 2-0 Ga, a thermal convection similar to the present plate tectonics occured. Thus the A/P event around 2.0 Ga should be the transition between the two convection modes.
We studied the global sea level change which is expected to have occurred when the above tempral change of mantle convection occurred. The sea level fell gradually since 4.0 Ga until 2 Ga. Around 2 Ga, when plate tectonics began, it rose suddenly by 800 m, and since 1.3 Ga when it reached the peak, it fell gradually until present. The continent area above sea level exceeded more than 40 % of the present area during 2.8-1.9 Ga and 1.0-0 Ga. The second order sea level change was calculated by reconstructing Wilson cycles since 1.9 Ga. CO2 content in the atmosphere and surface temperature were recovered using GEOCARB model. To combine this with the climate or ocean general circulation models, we studied the response of a climate system under continent and ocean distributions different from the present ones.
We studied the evolution of the Earth system as a complex system, and found that it self-organizes into a critical state, i.e., an edge of chaos. This happens because each element of the system decides its behavior by observing himself through other elements.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Priority Areas, Earthquake Research Institute, University of Tokyo, 07238101

海洋生物化学大循環モデルによる人為起源物質の海洋による吸収機構の解明
科学研究費助成事業 奨励研究(A)
1996 - 1996
山中 康裕
GAIM/IGBPのもとで行なわれているOCMIP(Ocean Carbon-Cycle Model Intercomparison Project)で定めた実験を行なう準備として本年度は、観測された二酸化炭素・フロン・放射性炭素の大気中濃度の時系列データを境界条件として与え、海洋生物化学大循環モデルを走らせ、人為起源物質の海洋による吸収を評価を行なった。
行なった研究の成果は、以下の通りである。
・1980年代の人為起源二酸化炭素の海洋による吸収量は、2.0Gt/yrで、IPCCレポートで報告されたものと同じになった。しかしながら、本研究では、IPCCレポートで南半球海洋の過大評価とされていた領域では吸収量が減少し、北半球海洋の過小評価されていた領域では、IPCCレポートのものに比べると増加し、全体として、北半球の海洋の役割の重要性を示唆した。
・フロンの濃度分布は、溶解の温度依存性によって大まかに決まり、人為起源のΔ^<14>Cと人為起源の二酸化炭素濃度とは、かなり似た分布をとる。但し、比較的似ている人為起源のΔ^<14>Cからさえも、観測で直接求まらない人為起源の二酸化炭素濃度の分布を推定することは、過去の大気中濃度の履歴の相違より、難しいことが分かった。
・北太平洋では、人為起源の二酸化炭素はおおよそ1000m以浅にのみ貯蓄されるが、北太平洋の面積が広いために、北太平洋の吸収量は、北大西洋のものと同程度となる。
日本学術振興会, 奨励研究(A), 東京大学, 08780499

海洋生物化学大循環モデルによる海洋炭素循環の解明
科学研究費助成事業 奨励研究(A)
1995 - 1995
山中 康裕
海洋大循環モデルに簡単な生物化学過程を組み込んだ海洋生物化学大循環モデルを用いて、主要なパラメタに関する依存生を明らかにした。おもな成果は以下の通りである。
1.モデルの結果より方解石の飽和度を計算し、そこから見積もられるlysoclineは観測から得られる分布を良く再現する。ケイ酸塩循環を新たに計算し、それより得られる珪藻の生産分布は、観測から得られる分布を再現する。従って、遠洋深海底における大まかな堆積環境の再現が出来る可能性を示した。
2.氷期における理想化された海洋循環の例として、北大西洋の海面塩分を現在のものより低下させた実験においては、北大西洋深層水が形成されないことが分かった。
このとき、塩分や方解石の飽和度分布は、観測事実を調和的であるが、炭素同位体分布は、観測事実と異なる結果となった。これは、北大西洋深層水が現在より弱いながらも形成されていたことの傍証となる。
3.現在の海洋循環から2.で示した海洋循環に仮想的に突然切替えた場合(またはその逆の場合)、大西洋は数百年の時間スケールで応答するが、太平洋は、数千年の時間スケールで応答することが分かった。これは、海底コアなどで気候変動がどのように記録されるかという点を考察する場合に有益な情報を提供するものと考えられる。
日本学術振興会, 奨励研究(A), 東京大学, 07740385

海洋生物化学大循環モデルによる海洋炭素循環の解明
科学研究費助成事業 奨励研究(A)
1994 - 1994
山中 康裕
海洋大循環モデルに簡単な生物化学過程を組み込んだ海洋生物化学大循環モデルを用いて、主要なパラメタに関する依存性を明らかにした。おもな成果は以下の通りである。
1.沈降粒子フラックスの鉛直分布は、溶存酸素・リン酸などのトレーサー分布に影響し、溶ける深度が深いほど、水平濃度勾配が強くなることが分かった。特に、セジメントトラップによる観測分布を用いた時のみ、観測されたトレーサー分布を再現することが示された。
2.溶存酸素などにトレーサ分布は、鉛直拡散係数に強く依存することが分かった。すなわち、沈降粒子フラックスから決まる鉛直スケールと鉛直拡散・移流から決まる鉛直スケールがほぼ同じ程度であるため、鉛直拡散係数が大きい場合には、栄養塩トラップメカニズムによって、生物生産が高い赤道表層直下に酸素極小値が存在し、観測された分布と大きく異なる。それに対して、鉛直拡散係数が小さい場合には、北太平洋北部に酸素極小値が存在し、観測分布を再現する。これと、従来のモデルを用いた研究において、観測分布をうまく再現できなかった理由と考えられる。
モデルの結果の解析より、赤道太平洋・北太平洋でほぼ閉じたリン酸塩循環をしていることが分かった。これは、水塊で考えられている大西洋から太平洋へつながるコンベア・ベルトの概念とは異なり、現実の海洋でも閉じた栄養塩循環をしていることが示唆される。
日本学術振興会, 奨励研究(A), 東京大学, 06740368

地球温暖化における海洋による人為起源二酸化炭素吸収と海洋生態系変動の解明と予測
Competitive research funding