Isada Tomonori
| Field Science Center for Northern Biosphere Aquatic Research Station Akkeshi Marine Station | Associate Professor |
Last Updated :2025/12/04
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Researcher number
- 80725359
J-Global ID
Research Field
Educational Organization
- Bachelor's degree program, School of Science
- Master's degree program, Graduate School of Environmental Science
- Doctoral (PhD) degree program, Graduate School of Environmental Science
■Career
Committee Memberships
■Research activity information
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Papers
- Impact of a Large Shallow Semi‐Enclosed Lagoon on Freshwater Exchange Across an Inlet Channel
Shinichiro Kida, Kiyoshi Tanaka, Tomonori Isada, Tomohiro Nakamura
Journal of Geophysical Research: Oceans, 129, 1, American Geophysical Union (AGU), 27 Dec. 2023, [Peer-reviewed]
Scientific journal, Abstract
The impact of a large shallow semi‐enclosed lagoon on freshwater exchange across an inlet channel is investigated using an idealized numerical model. Lagoons are often found between a river mouth and the ocean; we focus on those where the river discharge rate is small and the inlet channel is narrower and deeper than the lagoon. Tides generate freshwater and oceanic‐water plumes across the channel; a stratified freshwater plume forms in the ocean from the late ebb to early flood phase, while a vertically well‐mixed oceanic‐water plume forms in the lagoon from the late flood to early ebb phase. The shallow depth of the lagoon increases the flow speed of the oceanic‐water plume, which results in the formation of a sharp and vertically well‐mixed salinity front within the lagoon. When this front moves toward the ocean during the ebb phase, vertical mixing increases where the bathymetry deepens and freshwater encounters oceanic water below. Without a dredged bottom slope, the impact of mixing would be greatly reduced within the shallow lagoon and channel, as the shallow depth would limit the subsurface intrusion of oceanic water. The narrow channel further causes the flow to converge and accelerate, enhancing both internal shear‐driven and bottom boundary‐layer mixing at the channel and increasing freshwater plume thickness where it enters the ocean. Sensitivity experiments showed that the role of tidal pumping in freshwater exchange across the channel increases when the lagoon area and tidal mixing increase and when the estuarine Richardson number decreases. - IOCCG Protocol Series (2022). Aquatic Primary Productivity Field Protocols for Satellite Validation and Model Synthesis.
Balch, W.M, Carranza, M, Cetinić, I, Chaves, J.E, Duhamel, S, Fassbender, A, Fernandez-Carrera, A, Ferrón, S, García-Martín, E, Goes, J, Gomes, H, Gundersen, K, Halsey, K, Hirawake, T, Isada, T, Juranek, L, Kulk, G, Langdon, C, Letelier, R, López-Sandoval, D, Mannino, A, Marra, J.F, Neale, P, Nicholson, D, Silsbe, G, Stanley, R.H, Vandermeulen, R.A
IOCCG Ocean Optics and Biogeochemistry Protocols for Satellite Ocean Colour Sensor Validation, 7, 1, 201, Sep. 2022, [Peer-reviewed]
English, Scientific journal - Spatial variation in diatom abundance and composition in Biwase Bay and Hamanaka Bay (Eastern Hokkaido, Japan), with reference to environmental features
Hyojin Ahn, Miho Ito, Naoko Kouchi, Kentaro Watanabe, Hiroya Abe, Tomonori Isada, Masahiro Nakaoka
PeerJ, 10, e13705, e13705, PeerJ, 27 Jul. 2022, [Peer-reviewed]
English, Scientific journal, This study aims to examine the spatial variation of diatom abundance and composition along the nearshore areas of Biwase Bay and Hamanaka Bay, eastern Hokkaido. Terrestrial input via Kiritappu Wetland is expected to affect variation and composition differently depending on the position of the two bays. We conducted an oceanographic survey in June 2014 to measure seawater temperature, salinity, colored dissolved organic matter (CDOM) absorption, nutrient concentrations, and total and size-fractionated chlorophyll (Chl) a concentration at 11 stations of the shallowest (<5 m) parts of the bays. These were grouped into four areas (Areas 1 and 2 in Biwase Bay, and Areas 3 and 4 in Hamanaka Bay) based on the distance of the location from the wetland outlet (nearest in Area 1 to the farthest in Area 4). Diatoms are the major primary producers in the water column. Therefore, we also determined genus level cell abundance and diversity of diatoms to compare similarity among areas. Sea surface temperature was the lowest at Area 4, whereas sea surface salinity was the lowest at Area 1. The contribution of CDOM absorption, an indicator of wetland-influenced river discharge, and silica concentration was highest at Area 1. Total amount of nitrite and nitrate concentrations was the highest at Area 4. Total amount of Chl a concentration was also lowest in Area 1. Our size-fractionated Chl a results revealed that while the size composition of phytoplankton varied among areas, micro-sized (>10 µm) phytoplankton were predominant in Area 4. Finally, diatom composition at the genus level differed greatly among areas. Pennate diatoms were predominant in Areas 1 and 2, but centric diatoms dominated in Areas 3 and 4. Our results suggested great spatial variability in oceanographic conditions among areas, with less influence of wetland and more influence of Coastal Oyashio Water based on distance from the wetland outlet. Diatom composition showed geographical division between Biwase and Hamanaka Bays. - Performance of primary production algorithm using absorption coefficient of phytoplankton in the Pacific Arctic
Ryosuke Futsuki, Toru Hirawake, Amane Fujiwara, Hisatomo Waga, Takashi Kikuchi, Shigeto Nishino, Tomonori Isada, Koji Suzuki, Yutaka W. Watanabe
Journal of Oceanography, 08 Jun. 2022, [Peer-reviewed]
Scientific journal - Morphological variation and phylogeny of Karenia selliformis (Gymnodiniales, Dinophyceae) in an intensive cold-water algal bloom in eastern Hokkaido, Japan
Mitsunori Iwataki, Wai Mun Lum, Koyo Kuwata, Kazuya Takahashi, Daichi Arima, Takanori Kuribayashi, Yuki Kosaka, Natsuki Hasegawa, Tsuyoshi Watanabe, Tomoyuki Shikata, Tomonori Isada, Tatiana Yu. Orlova, Setsuko Sakamoto
Harmful Algae, 114, 102204, 102204, May 2022, [Peer-reviewed]
English, Scientific journal - Evaluation of retrieving chlorophyll a concentration and colored dissolved organic matter absorption from satellite ocean color remote sensing in the coastal waters of Hokkaido, Japan
Tomonori Isada, Stanford B. Hooker, Yukiko Taniuchi, Koji Suzuki
Journal of Oceanography, Springer Science and Business Media LLC, 23 Feb. 2022, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, 13207498 - Performance of JAXA’s SGLI standard ocean color products for oceanic to coastal waters: chlorophyll a concentration and light absorption coefficients of colored dissolved organic matter
Atsushi Matsuoka, Janet W. Campbell, Stanford B. Hooker, François Steinmetz, Kazunori Ogata, Takafumi Hirata, Hiroto Higa, Victor S. Kuwahara, Tomonori Isada, Koji Suzuki, Toru Hirawake, Joji Ishizaka, Hiroshi Murakami
Journal of Oceanography, 78, 4, 187, 208, 23 Oct. 2021, [Peer-reviewed]
English, Scientific journal - Dynamics of Nutrients and Colored Dissolved Organic Matter Absorption in a Wetland-Influenced Subarctic Coastal Region of Northeastern Japan: Contributions From Mariculture and Eelgrass Meadows
Tomonori Isada, Hiroya Abe, Hiromi Kasai, Masahiro Nakaoka
Frontiers in Marine Science, 8, Frontiers Media SA, 11 Oct. 2021, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal, Coastal oceans interacting with terrestrial ecosystems play an important role in biogeochemical cycles. It is therefore essential to research land–ocean interactions for further understanding of the processes influencing nutrients dynamics in coastal areas. We investigated the seasonal and spatial distribution of nutrient concentrations and light absorption coefficients of colored dissolved organic matter (CDOM), non-algal particles (NAP), and phytoplankton in a wetland-influenced river–eelgrass meadows–coastal waters continuum in the protected and semi-enclosed coastal sea of Akkeshi-ko estuary (AKE) and Akkeshi Bay (AB), Japan from April 2014 to February 2015. The mixing dilution lines of the CDOM absorption coefficient at 355 nm [a CDOM(355)] relative to salinity predicted by two end-members between freshwater and coastal water showed conservative mixing in AB. Silicate concentrations were significantly correlated with salinity anda CDOM(355) in AB in each month except for December 2014. These results suggest that silicate and CDOM in AB primarily originates from wetland-influenced river discharge. However, samples collected from the eelgrass meadows of AKE, where mariculture is developed, showed non-conservative mixing of silicate concentrations anda CDOM(355) with salinity except for June 2014. Elevated phosphate concentrations, probably released from sediments, were also found in the eelgrass meadows of AKE, especially during summer. These results suggest that the metabolic activities of mariculture and seagrass ecosystem significantly contribute to the nutrient cycles and CDOM absorption in AKE and to the distinct water-mass systems inside and outside AKE. The relative absorption properties of NAP [a NAP(443)], phytoplankton [a ph(443)], anda CDOM(443) showed that CDOM is the main factor affecting the light distribution in AKE. However, the relative absorption properties varied seasonally in AB because of spring and autumn phytoplankton blooms and ice cover during winter. Significant relationships were observed between the Secchi disk depth (Z SD),a NAP(443), anda CDOM(443). Chla concentration anda ph(443) were not good indicators for predictingZ SD in our study region. These results suggest that incorporating inherent optical properties and CDOM from mariculture and seagrass ecosystem into ecosystem models could improve predictions of light distribution along the freshwater–eelgrass–coastal waters continuum in optically complex coastal waters., 13207497 - Correction: Kulk et al. Primary production, an index of climate change in the ocean: Satellite-based estimates over two decades (Remote Sens., (2020), 12, (826), 10.3390/rs12050826)
Gemma Kulk, Trevor Platt, James Dingle, Thomas Jackson, Bror F. Jönsson, Heather A. Bouman, Marcel Babin, Robert J. W. Brewin, Martina Doblin, Marta Estrada, Francisco G. Figueiras, Ken Furuya, Natalia González-Benítez, Hafsteinn G. Gudfinnsson, Kristinn Gudmundsson, Bangqin Huang, Tomonori Isada, Žarko Kovač, Vivian A. Lutz, Emilio Marañón, Mini Raman, Katherine Richardson, Patrick D. Rozema, Willem H. van de Poll, Valeria Segura, Gavin H. Tilstone, Julia Uitz, Virginie van Dongen-Vogels, Takashi Yoshikawa, Shubha Sathyendranath
Remote Sensing, 13, 17, MDPI, 01 Sep. 2021
English, Scientific journal - Spectral modes of radiometric measurements in optically complex waters
Stanford B. Hooker, Henry F. Houskeeper, Raphael M. Kudela, Atsushi Matsuoka, Koji Suzuki, Tomonori Isada
Continental Shelf Research, 219, 104357, 104357, Elsevier BV, Apr. 2021, [Peer-reviewed]
English, Scientific journal - Primary Production, an Index of Climate Change in the Ocean: Satellite-Based Estimates over Two Decades
Gemma Kulk, Trevor Platt, James Dingle, Thomas Jackson, Bror F. Jönsson, Heather A. Bouman, Marcel Babin, Robert J. W. Brewin, Martina Doblin, Marta Estrada, Francisco G. Figueiras, Ken Furuya, Natalia González-Benítez, Hafsteinn G. Gudfinnsson, Kristinn Gudmundsson, Bangqin Huang, Tomonori Isada, Žarko Kovacˇ, Vivian A. Lutz, Emilio Marañón, Mini Raman, Katherine Richardson, Patrick D. Rozema, Willem H. van de Poll, Valeria Segura, Gavin H. Tilstone, Julia Uitz, Virginie van Dongen-Vogels, Takashi Yoshikawa, Shubha Sathyendranath
remote sensing, 12, 5, 826, 826, MDPI AG, Mar. 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, Primary production by marine phytoplankton is one of the largest fluxes of carbon on our planet. In the past few decades, considerable progress has been made in estimating global primary production at high spatial and temporal scales by combining in situ measurements of primary production with remote-sensing observations of phytoplankton biomass. One of the major challenges in this approach lies in the assignment of the appropriate model parameters that define the photosynthetic response of phytoplankton to the light field. In the present study, a global database of in situ measurements of photosynthesis versus irradiance (P-I) parameters and a 20-year record of climate quality satellite observations were used to assess global primary production and its variability with seasons and locations as well as between years. In addition, the sensitivity of the computed primary production to potential changes in the photosynthetic response of phytoplankton cells under changing environmental conditions was investigated. Global annual primary production varied from 38.8 to 42.1 Gt C yr − 1 over the period of 1998–2018. Inter-annual changes in global primary production did not follow a linear trend, and regional differences in the magnitude and direction of change in primary production were observed. Trends in primary production followed directly from changes in chlorophyll-a and were related to changes in the physico-chemical conditions of the water column due to inter-annual and multidecadal climate oscillations. Moreover, the sensitivity analysis in which P-I parameters were adjusted by ±1 standard deviation showed the importance of accurately assigning photosynthetic parameters in global and regional calculations of primary production. The assimilation number of the P-I curve showed strong relationships with environmental variables such as temperature and had a practically one-to-one relationship with the magnitude of change in primary production. In the future, such empirical relationships could potentially be used for a more dynamic assignment of photosynthetic rates in the estimation of global primary production. Relationships between the initial slope of the P-I curve and environmental variables were more elusive. - Community composition and photophysiology of phytoplankton assemblages in coastal Oyashio waters of the western North Pacific during early spring (vol 212, pg 81, 2018)
Kazuhiro Yoshida, Hisashi Endo, Evelyn Lawrenz, Tomonori Isada, Stanford B. Hooker, Ondrej Prasil, Koji Suzuki
ESTUARINE COASTAL AND SHELF SCIENCE, 228, Nov. 2019, [Peer-reviewed]
English - Corrigendum − Yoshida et al., 2018 (Estuarine, Coastal and Shelf Science (2018) 212 (80–94), (S0272771417310107), (10.1016/j.ecss.2018.06.018))
Yoshida, K., Endo, H., Lawrenz, E., Isada, T., Hooker, S.B., Pr{\'a}?il, O., Suzuki, K.
Estuarine, Coastal and Shelf Science, 228, 2019
Scientific journal - Responses of phytoplankton assemblages to iron availability and mixing water masses during the spring bloom in the Oyashio region, NW Pacific
T. Isada, A Hattori-Saito, H. Saito, Y. Kondo, J. Nishioka, K. Kuma, H. Hattori, R. M, L. McKay, K. Suzuki
Limnology and Oceanography, 64, 1, 197, 216, Wiley, 2019, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - GCOM-C/SGLI OCEAN STANDARD PRODUCTS AND EARLY VALIDATION RESULTS
Mitsuhiro Toratani, Kazunori Ogata, Koji Suzuki, Joji Ishizaka, Toru Hirawake, Takafumi Hirata, Tomonori Isada, Hiroto Higa, Victor S. Kuwahara, Stanford B. Hooker, Yoko Kiyomoto, Hiroshi Murakami, Yukio Kurihara, Masahiro Hori, Hisatomo Waga, Youhei Yamashita, Akihiko Tanaka
2019 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS 2019), 4741, 4744, 2019
English, International conference proceedings - Community composition and photophysiology of phytoplankton assemblages in coastal Oyashio waters of the western North Pacific during early spring
K. Yoshida, H Endo, E. Lawrenz, T. Isada, S. B. Hooker, O. Prášil, K. Suzuki
Estuarine, Coastal and Shelf Science, 212, 80, 84, 2018, [Peer-reviewed]
English, Scientific journal - Influence of hydrography on the spatiotemporal variability of phytoplankton assemblages and primary productivity in Funka Bay and the Tsugaru Strait
Tomonori Isada, Toru Hirawake, Satoshi Nakada, Tsukuru Kobayashi, Ken'ichi Sasaki, Yoshiyuki Tanaka, Shuichi Watanabe, Koji Suzuki, Sei-Ichi Saitoh
ESTUARINE COASTAL AND SHELF SCIENCE, 188, 199, 211, Mar. 2017, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Estimation of ocean primary production from satellite remote sensing
平譯享, 高尾信太郎, 鈴木光次, 西岡純, 渡邉豊, 伊佐田智規
Oceanography in Japan, 23, 3, 65, 77, 日本海洋学会, 2017, [Peer-reviewed]
Japanese, Scientific journal - Hyperspectral optical discrimination of phytoplankton community structure in Funka Bay and its implications for ocean color remote sensing of diatoms
Tomonori Isada, Toru Hirawake, Tsukuru Kobayashi, Yuichi Nosaka, Masafumi Natsuike, Ichiro Imai, Koji Suzuki, Sei-Ichi Saitoh
REMOTE SENSING OF ENVIRONMENT, 159, 134, 151, Mar. 2015, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Bio-optical properties during the summer season in the Sea of Okhotsk
Shintaro Takao, Takahiro Iida, Tomonori Isada, Sei-Ichi Saitoh, Takafumi Hirata, Koji Suzuki
PROGRESS IN OCEANOGRAPHY, 126, 233, 241, Aug. 2014, [Peer-reviewed]
English, Scientific journal - Light utilization efficiency of phytoplankton in the Western Subarctic Gyre of the North Pacific during summer
Yuichi Nosaka, Tomonori Isada, Isao Kudo, Hiroaki Saito, Hiroshi Hattori, Atsushi Tsuda, Koji Suzuki
JOURNAL OF OCEANOGRAPHY, 70, 1, 91, 103, Feb. 2014, [Peer-reviewed]
English, Scientific journal - Spatial variability in iron nutritional status of large diatoms in the Sea of Okhotsk with special reference to the Amur River discharge
K. Suzuki, A. Hattori-Saito, Y. Sekiguchi, J. Nishioka, M. Shigemitsu, T. Isada, H. Liu, R. M. L. McKay
BIOGEOSCIENCES, 11, 9, 2503, 2517, 2014, [Peer-reviewed]
English, Scientific journal - Improvement of an aquaculture site-selection model for Japanese kelp (Saccharina japonica) in southern Hokkaido, Japan: an application for the impacts of climate events
Yang Liu, Sei-Ichi Saitoh, I. Nyoman Radiarta, Tomonori Isada, Toru Hirawake, Hiroyuki Mizuta, Hajime Yasui
ICES JOURNAL OF MARINE SCIENCE, 70, 7, 1460, 1470, Nov. 2013, [Peer-reviewed]
English, Scientific journal - Influence of Amur River discharge on phytoplankton photophysiology in the Sea of Okhotsk during late summer
Tomonori Isada, Takahiro Iida, Hongbin Liu, Sei-Ichi Saitoh, Jun Nishioka, Takeshi Nakatsuka, Koji Suzuki
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 118, 4, 1995, 2013, Apr. 2013, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Modeling runoff into a Region Of Freshwater Influence for improved ocean prediction: Application to Funka Bay
S. Nakada, Y. Ishikawa, T. Awaji, T. In, S. Shima, T. Nakayama, T. Isada, S.-I. Saitoh
Hydrological Research Letters, 6, 47, 52, THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES, 2012, [Peer-reviewed]
English, Scientific journal, Regions Of Freshwater Influence (ROFI) existing between oceans and estuaries often yield significant fishery resources. To inform fishermen of the real-time ocean state, an operational prediction system focusing on a specific coastal region would normally require accurate and timely runoff data for all rivers. In this paper, hydrometeorological procedures providing the required runoff data on a daily basis were coupled with an Ocean General Circulation Model (OGCM) to evaluate the impacts of runoff processes on ocean simulations within a ROFI. The procedures we adopted employ a distributed tank model based on water mass and heat budgets derived from predicted meteorological datasets. An exponential relationship between runoff rates and watershed areas was used to determine model parameters in order to estimate the runoff from many other small rivers. The coupled model reproduced a surface salinity field in the bay that was in good agreement with observations, and simulated the expected clockwise circulation generated by the high net total discharge associated with snowmelt. Our results underline the fact that implementation of hydrological processes into ocean simulations is essential for a better understanding of water circulation driven by runoff into semi-enclosed bays over interannual timescales. - 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]
English, Scientific journal - Primary productivity and its bio-optical modeling in the Oyashio region, NW Pacific during the spring bloom 2007
Tomonori Isada, Ai Hattori-Saito, Hiroaki Saito, Tsutomu Ikeda, Koji Suzuki
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 57, 17-18, 1653, 1664, Sep. 2010, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Community structure and photosynthetic physiology of phytoplankton in the northwest subarctic Pacific during an in situ iron fertilization experiment (SEEDS-II)
Koji Suzuki, Hiroaki Saito, Tomonori Isada, Ai Hattori-Saito, Hiroshi Kiyosawa, Jun Nishioka, R. Michael. L. McKay, Akira Kuwata, Atsushi Tsuda
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 56, 26, 2733, 2744, Dec. 2009, [Peer-reviewed]
English, Scientific journal - Photosynthetic features and primary productivity of phytoplankton in the Oyashio and Kuroshio-Oyashio transition regions of the northwest Pacific
Tomonori Isada, Akira Kuwata, Hiroaki Saito, Tsuneo Ono, Masao Ishii, Hisayuki Yoshikawa-Inoue, Koji Suzuki
JOURNAL OF PLANKTON RESEARCH, 31, 9, 1009, 1025, Sep. 2009, [Peer-reviewed], [Lead author, Corresponding author]
English, Scientific journal - Primary productivity and photosynthetic features of phytoplankton in the Sea of Okhotsk during late summer
Tomonori Isada, Koji Suzuki, Hongbin Liu, Jun Nishioka, Takeshi Nakatsuka
PICES Scientific Report No.36, 36, Aug. 2009, [Lead author]
English, International conference proceedings - 夏季のオホーツク海および千島列島海域における基礎生産過程の特徴
鈴木光次, 伊佐田智規, Hongbin Liu, 飯田高大
月刊海洋, No.50, 99-106, 2008 - Evidence for the grazing hypothesis: Grazing reduces phytoplankton responses of the HNLC ecosystem to iron enrichment in the western subarctic pacific (SEEDS II)
Atsushi Tsuda, Shigenobu Takeda, Hiroaki Saito, Jun Nishioka, Isao Kudo, Yukihiro Nojiri, Koji Suzuki, Mitsuo Uematsu, Mark L. Wells, Daisuke Tsumune, Takeshi Yoshimura, Tatsuo Aono, Takafumi Aramaki, William P. Cochlan, Maki Hayakawa, Keiri Imai, Tomoshi Isada, Yoko Iwamoto, William K. Johnson, Sohiko Kameyama, Shungo Kato, Hiroshi Kiyosawa, Yoshiko Kondo, Maurice Levasseur, Ryuji J. Machida, Ippei Nagao, Fumiko Nakagawa, Takahiro Nakanish, Seiji Nakatsuka, Akira Narita, Yoshifumi Noiri, Hajime Obata, Hiroshi Ogawa, Kenji Oguma, Tsuneo Ono, Tomofumi Sakuragi, Motoki Sasakawa, Mitsuhide Sato, Akifumi Shimamoto, Hyoe Takata, Charles G. Trick, Yutaka W. Watanabe, Chi Shing Wong, Naoki Yoshie
JOURNAL OF OCEANOGRAPHY, 63, 6, 983, 994, Dec. 2007, [Peer-reviewed]
English, Scientific journal
Other Activities and Achievements
- GCOM-C/SGLI海洋圏プロダクトのVer.3アップデート概要と検証結果
中山大雅, 栗原幸雄, 村上浩, 虎谷充弘, 緒方一紀, 平田貴文, 石坂丞二, 平譯享, 松岡敦, 鈴木光次, KUWAHARA Victor S., 伊佐田智規, 日本海洋学会大会講演要旨集(Web), 2022, 2022 - 湿原起源の鉄の海洋への輸送プロセスの解明
加藤寛己, 芳村毅, 伊佐田智規, 黒田寛, 白岩孝行, 長尾誠也, 西岡純, 村山愛子, 山下洋平, 日本海洋学会大会講演要旨集, 2020, 2020 - Variation of aquatic humic substances characteristics in river, brackish lake and coastal marine environment
宮川和大, 長尾誠也, 芳村毅, 加藤寛己, 伊佐田智規, 日本地球化学会年会要旨集(Web), 67th, 2020 - 植物プランクトン群集組成をトレーサーとした秋の道東沿岸海域の水塊分布
谷内由貴子, 黒田寛, 伊佐田智規, 芳村毅, 葛西広海, 水産海洋学会研究発表大会講演要旨集, 2018, 2018 - SGLI/GCOM‐Cのための純基礎生産推定アルゴリズム
平譯享, 夫津木亮介, 新明克人, 藤原周, 伊佐田智規, 高尾信太郎, 鈴木光次, 渡邉豊, 野坂裕一, 日本海洋学会大会講演要旨集, 2016, 120, Mar. 2016
Japanese - 北海道東部沿岸域の厚岸沖における植物プランクトン群集組成と光合成特性の季節変化
伊佐田智規, 平譯享, 鈴木光次, 西岡純, 葛西広海, 阿部博哉, 日本海洋学会大会講演要旨集, 2016, 275, Mar. 2016
Japanese - Akkeshi marine station, field science center for northern biosphere, Hokkaido University(from field research sites (26))
Nakaoka M, Isada T, Honda K, Kitamura T, Japanese Journal of Ecology, 64, 1, 87, 91, 2014
The Ecological Society of Japan, Japanese - 噴火湾における植物プランクトン群集組成と基礎生産力の季節変化
伊佐田智規, 平譯享, 小林創, 西岡純, 鈴木光次, 齊藤誠一, 日本海洋学会大会講演要旨集, 2013, 157, 11 Mar. 2013
Japanese - AQUACULTURE SITE SELECTION FOR GAGOME KELP, KJELLMANIELLA CRASSIFOLIA, IN SOUTHERN HOKKAIDO, JAPAN, USING SATELLITE REMOTE SENSING AND GIS-BASED MODELS
SAITOH SEI-ICHI, SHIBATA HARUKA, LIU YANG, NYOMAN RADIARTA I, ISADA TOMONORI, HIRAWAKE TORU, MIZUTA HIROYUKI, YASUI HAJIME, 日本リモートセンシング学会学術講演会論文集, 54th, 403, 2013
English - 生物地球化学過程に果たす環オホーツク圏の海洋循環・物質循環の役割 夏季の西部北太平洋亜寒帯循環域における植物プランクトンの光合成による水柱の光利用効率
野坂裕一, 鈴木光次, 伊佐田智規, 齊藤宏明, 津田敦, 服部寛, 月刊海洋, 44, 8, 473, 477, 01 Aug. 2012
Japanese - 基礎生産力と海面温度の関係およびその分布
新明克仁, 平譯享, 高尾信太郎, 伊佐田智規, 藤原周, 齊藤誠一, 日本海洋学会大会講演要旨集, 2012, 277, 13 Mar. 2012
Japanese - ハイパースペクトルセンサーを用いた植物プランクトン群集(珪藻類)推定方法の開発
伊佐田智規, 平譯享, 小林創, 松本慧太郎, 野坂裕一, 鈴木光次, 齊藤誠一, 日本海洋学会大会講演要旨集, 2012, 211, 13 Mar. 2012
Japanese - 噴火湾およびその周辺海域における植物プランクトン群集による基礎生産力の時空間変化
伊佐田智規, 平譯享, 葛西広海, 小埜恒夫, 渡邉豊, 鈴木光次, 齊藤誠一, 水産海洋学会研究発表大会講演要旨集, 2011, 28, 2011
Japanese - 2008年夏季の西部北太平洋亜寒帯域における植物プランクトンによる水柱の光合成光利用効率の特性
野坂裕一, 伊佐田智規, 鋤柄千穂, 齊藤宏明, 津田敦, 鈴木光次, 日本海洋学会大会講演要旨集, 2010, 147, 15 Mar. 2010
Japanese - 2007年親潮域春季ブルーム期における植物プランクトン群集の光合成特性
伊佐田智規, 鈴木光次, 齊藤(服部)愛, 齊藤宏明, 葛西広海, 齊藤誠一, 池田勉, 日本海洋学会大会講演要旨集, 2010, 141, 15 Mar. 2010
Japanese - 親潮域春季ブルームの空間変動要因
齊藤宏明, 近藤能子, 西岡純, 高橋一生, 中町美和, 岡崎雄二, 伊佐田智規, 桑田晃, 清水勇吾, 鈴木光次, 日本海洋学会大会講演要旨集, 2009, 183, 11 Sep. 2009
Japanese - 2007年親潮域春季ブルーム期における衛星リモートセンシングを用いた基礎生産の推定
伊佐田智規, 鈴木光次, 服部愛, 齊藤宏明, 葛西広海, 齊藤誠一, 池田勉, 日本海洋学会大会講演要旨集, 2009, 200, 23 Mar. 2009
Japanese - 2007年春季親潮ブルームにおける珪藻種組成の特徴
服部愛, 鈴木光次, 駒崎奈津子, 服部寛, 伊佐田智規, 齊藤宏明, 池田勉, 日本海洋学会大会講演要旨集, 2009, 171, 23 Mar. 2009
Japanese - 水中分光放射特性を用いたmicroplankton群集優占海域の識別
藤原周, 平譯享, 齊藤誠一, 本多牧生, 松本和彦, 鈴木光次, 伊佐田智規, みらいシンポジウム予稿集, 11th, 131, Mar. 2008
Japanese
Affiliated academic society
Research Themes
- Evaluation of the role of gel particles in oceanic material cycles
Grants-in-Aid for Scientific Research
01 Apr. 2025 - 31 Mar. 2028
野坂 裕一, 鈴木 光次, 伊佐田 智規
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Tokai University, 25K15420 - Spatio-temporal variations in the bioelement composition of particulate organic matters fractionated by plankton size
Grants-in-Aid for Scientific Research
01 Apr. 2025 - 31 Mar. 2028
芳村 毅, 伊佐田 智規, 今井 圭理
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 25K15414 - Evaluation of carbon outwelling from shallow coastal systems
Grants-in-Aid for Scientific Research
Apr. 2024 - Mar. 2028
伊佐田 智規, 片岡 剛文, 芳村 毅
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 24K03057 - Evaluation of contribution of land-source nutrients to subarctic coastal marine ecosystems
Grants-in-Aid for Scientific Research
Jun. 2022 - Mar. 2027
黒田 寛, 片岡 剛文, 白藤 徳夫, 中野渡 拓也, 鬼塚 年弘, 谷内 由貴子, 伊佐田 智規, 丹羽 健太郎
Japan Society for the Promotion of Science, Grant-in-Aid for Transformative Research Areas (A), Fisheries Research and Education Agency, Coinvestigator, 22H05203 - アマモ場におけるブルーカーボン貯留経路としての透明細胞外重合物質粒子および粒状有機炭素の変動要因の解明
令和6年度若手研究者活動支援制度助成金
Apr. 2024 - Mar. 2025
伊佐田智規
公益財団法人 国際エメックスセンター, Principal investigator - 海洋生態系解析のための SGLI 海色プロダクトの検証と改良
第3回地球観測研究公募 (EO-RA3)
Apr. 2022 - Mar. 2025
平田貴文, 平譯享, 伊佐田智規, 田中昭彦, 吉川尚, アイリーンアラビア, 佐藤恵子, 緒方一紀
宇宙航空研究開発機構（JAXA）, Coinvestigator - Validation for ocean color products and development of marine spatial information using multiple satellite applications in the coastal waters of Hokkaido: toward sustainable management of fisheries resources
Research Announcement on the Earth Observations (EO-RA3)
Apr. 2022 - Mar. 2025
Tomonori Isada
Japan Aerospace Exploration Agency (JAXA), Principal investigator - Dynamics of Transparent Exopolymer Particles (TEPs) in the eelgrass meadows of Akkeshi-ko estuary, Japan
FY2023 Grants-in-Aid for young researchers
Apr. 2023 - Mar. 2024
伊佐田智規
International EMECS Center, Principal investigator, Competitive research funding - Overlooked process of land-ocean interactions: Quantitative evaluation on the impact of coastal landslide on marine ecosystems
Grants-in-Aid for Scientific Research
Jul. 2021 - Mar. 2024
仲岡 雅裕, 伊佐田 智規, 土井 一生
北海道東部沿岸域を対象に、海岸地すべりによる土砂供給が沿岸生態系に与える影響の評価を行う。この目的を達成するため、(1)広域（10 kmスケール） の海域における沿岸生態系の定期調査、(2)地すべり発生後の生態系の変化の集中的な観測、(3)地すべり調査定点における連続的な観測、(4)上記の結果を取り入れた流動・生態系動態統合モデリングを組み合わせた研究を行う。観測結果を取り入れたモデルを用いたシミュレーションにより、陸源物質の河川を介した影響と地すべりによる土砂供給の直接的影響の相対的重要性を明らかにする。本研究で展開する生態学分野と地質学分野の異分野協働研究は、防災と生態系・生物多様性保全という社会的なニーズの高い課題を統合的に扱うことを通じて、新たな学問分野の創設につながることが期待される。
初年度は、研究サイトの選定および研究方法の検討を進めた。研究サイトについては、厚岸湾内の仙鳳趾エリアに海岸地すべりの連続観測サイトを設けて、地すべり動態の観測を開始するとともに、バラサン岬～愛冠～アイニンカップのエリアにかけてもドローンによる定期観測サイトを設定して観測を開始した。ドローン撮影の手法についても検討を行い、海岸崖の周辺域を含む撮影エリアに対して異なる撮影角度で連続撮影をし、画像を合成することで海岸崖の変化および崖の下の透明度や藻類の繁茂状況を把握する方法を確定した。さらに、アイニンカップエリアにおいては、実際の海岸崖くずれに伴い変化した海底における海草類の分布の変化について観測を開始したところ、海底地形の変化に伴いオオアマモの分布が拡大するとともに種子繁殖にかかる形質の変化が生じていることも発見した。
Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Exploratory), Hokkaido University, Coinvestigator, Competitive research funding, 21K19854 - The impact of river outflows on the coastal environment
Grants-in-Aid for Scientific Research
Apr. 2021 - Mar. 2024
木田 新一郎, 田中 潔, 芳村 毅, 伊佐田 智規
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Kyushu University, Coinvestigator, Competitive research funding, 21H03591 - Dynamics of Transparent Exopolymer Particles (TEPs) in the eelgrass meadows of Akkeshi-ko estuary, Japan
FY2022 Grants-in-Aid for young researchers
Apr. 2022 - Mar. 2023
伊佐田智規
International EMECS Center, Principal investigator, Competitive research funding - Validation for SGLI/GCOM-C ocean color products in the coastal waters of Hokkaido
Research Announcement on the Earth Observations (EO-RA2)
Jul. 2019 - Mar. 2022
Tomonori Isada
Japan Aerospace Exploration Agency (JAXA), Principal investigator, Competitive research funding - Phytoplankton blooming dynamics in the coastal waters around Akkeshi,
Grants-in-Aid for Scientific Research
Apr. 2019 - Mar. 2022
Isada Tomonori
We investigated seasonal and annual changes in oceanographic conditions and phytoplankton community structure in the coastal waters of Akkeshi Bay, Japan to clarify the factors controlling summer blooms in this studied area. We also conducted (1) high frequency sampling of Chl a concentration and (2) the nutrient addition bioassay experiments at the pier of Akkeshi Marine Station (AMS). Massive phytoplankton blooms occurred during spring and summer every year, but diatom compositions were totally different between spring and summer because of the water mass exchanges from cold coastal Oyashio water (COW) to Modified- Soya Warm Current Water (M-SWCW). Additionally, we found the significant relationships between the amount of monthly integrated rainfall obtained from AMeDAS at Ohta and the monthly integrated Chl a concentration at the pier of AMS. These results suggest that summer phytoplankton bloom could be triggered by the nutrient supply from the wetland-influenced river discharge.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, Principal investigator, Competitive research funding, 19K06181 - Products validation for inherent and apparent optical properties, phytoplankton pigments, and net primary productivity derived from SGLi/GCOM-C in coastal waters
地球環境変動観測ミッション（GCOM）第6回研究公募
Apr. 2016 - Mar. 2019
Tomonori Isada
Japan Aerospace Exploration Agency (JAXA), Principal investigator, Competitive research funding - Algorithm development for the identification of Phytoplankton Functional Types (PFTs) with optical hyperspectral data in the coastal waters
Grants-in-Aid for Scientific Research
Apr. 2016 - Mar. 2019
ISADA Tomonori
We developed the algorithm for identification of Phytoplankton Functional Types (PFTs) with optical hyperspectral data of phytoplankton absorption to better understand marine biogeochemical cycles and to accelerate its implications for ocean color remote sensing applications. We selected four PFTs (diatoms, cyanobacteria, green algae, and dinoflagellates) as target PFTs. Our results indicate that an optical hyperspectral data with a derivative spectroscopy/similarity index (SI) method is a promising approach to identify the dominance of each PFT in the ocean. Additionally, we found that derivative spectra of phytoplankton absorption coefficients could be a useful indicator of bio-optical provinces.
Japan Society for the Promotion of Science, Grant-in-Aid for Young Scientists (B), Hokkaido University, Principal investigator, Competitive research funding, 16K16182 - Photosynthetic features and primary productivity of phytoplankton during the spring bloom in the Oyashio region, northwestern subarctic Pacific
Sasakawa Scientific Research Grant
Apr. 2008 - Mar. 2009
Tomonori Isada
Japan Science Society, Principal investigator, Competitive research funding
