Researcher Database

Inatsu Masaru
Faculty of Science Earth and Planetary Sciences Earth and Planetary Dynamics
Professor

Researcher Profile and Settings

Affiliation

  • Faculty of Science Earth and Planetary Sciences Earth and Planetary Dynamics

Job Title

  • Professor

Degree

  • Doctor of Environmental Earth Science(Hokkaido University)

J-Global ID

Research Interests

  • 気象シミュレーション   総観気象学   雪氷気象学   気象力学   応用気象学   大気海洋相互作用   気候変動   

Research Areas

  • Natural sciences / Atmospheric and hydrospheric science

Academic & Professional Experience

  • 2017/02 - Today Hokkaido University Faculty of Science
  • 2007/09 - 2017/01 北海道大学 理学(系)研究科(研究院) 准教授
  • 2007/04 - 2007/08 The University of Tokyo Center for Climate System Research
  • 2007/04 - 2007/08 国立大学法人東京大学 気候システム研究センター 特任助教
  • 2005/10 - 2007/03 国立大学法人東京大学 気候システム研究センター 特任助手
  • 2004/04 - 2005/09 Japan Science and Technology Agency
  • 2002/04 - 2004/03 日本学術振興会 特別研究員

Education

  • 2000/04 - 2002/09  Hokkaido University
  • 1998/04 - 2000/03  Hokkaido University
  • 1995/04 - 1998/03  Kyoto University  Faculty of Science  Faculty of Science
  • 1992/04 - 1995/03  北海道立 岩見沢東高等学校

Association Memberships

  • THE SOCIETY OF AGRICULTURAL METEOROLOGY OF JAPAN   THE OCEANOGRAPHIC SOCIETY OF JAPAN   the Meteorological Society of Japan   

Research Activities

Published Papers

  • Relative risk assessment for hypothetical radioactivity emission at a snow climate site.
    Inatsu, M, H. Suzuki, M. Kajino
    98 2019 [Not refereed][Not invited]
  • Heavy-rainfall duration bias in dynamical downscaling and its related synoptic patterns in summertime Asian monsoon.
    Tamaki, Y, M. Inatsu, N.-L. Dzung, T. J. Yamada
    Journal of Applied Meteorology and Climatology 57 1477 - 1496 2018 [Refereed][Not invited]
  • Empirical evaluated SDE modelling for dimensionality-reduced systems and its predictability estimates.
    Nakano, N, M. Inatsu, S. Kusuoka, Y. Saiki
    Japan Journal of Industrial and Applied Mathematics 1 - 37 2018 [Refereed][Not invited]
  • Yuta Katsuyama, Masaru Inatsu, Kazuki Nakamura, Sumito Matoba
    COLD REGIONS SCIENCE AND TECHNOLOGY 136 62 - 71 0165-232X 2017/04 [Refereed][Not invited]
     
    We estimate the response of snowpack to global warming along with the uncertainty of the snowpack change by using a combination of multiple general-circulation models (GCMs), a single regional atmospheric model, and a one-dimensional multi-layered snowpack model. The target site is Mt. Annupuri in Kutchan, Hokkaido, Japan. The forcing of the snowpack model is taken from dynamically downscaled data from GCMs for the present climate and GCMs in a decade when the global-mean temperature has increased by 2 K from present conditions. The results show that global warming would decrease the monthly-mean snow depth throughout the winter season. Other salient features are the decrease of snow depth by 60 cm with maximum uncertainty of 20 cm at the beginning of the snow ablation period, the occurrence of the snow-depth peak a month earlier, and the dominance of melt forms in an earlier season. The ratio of melt forms for all snowpack layers increases with little uncertainty before the snow ablation period. The ratio of hoar does not change much, even though the air temperature increases. The uncertainty in snowpack evaluation is also discussed. (C) 2017 Elsevier B.V. All rights reserved.
  • Inatsu, M, H. Kato, Y. Katsuyama, Y. Hiraoka, I. Obayashi
    Scientific Online Letters on the Atmosphere 13 214 - 218 2017 [Refereed][Not invited]
  • An alternative estimate of potential predictability on the Madden-Julian Oscillation phase space using S2S models.
    Ichikawa, Y, M. Inatsu
    Atmosphere 8 2017 [Refereed][Not invited]
  • 気象学の色遣い~均等色空間を利用したカラーリング~
    稲津 將, 濱田 篤
    天気 63 803 - 809 2016/10 [Refereed][Not invited]
  • Mizuo Kajino, Masahide Ishizuka, Yasuhito Igarashi, Kazuyuki Kita, Chisato Yoshikawa, Masaru Inatsu
    ATMOSPHERIC CHEMISTRY AND PHYSICS 16 (20) 13149 - 13172 1680-7316 2016/10 [Refereed][Not invited]
     
    The long-term effect of Cs-137 re-suspension from contaminated soil and forests due to the Fukushima nuclear accident has been quantitatively assessed by numerical simulation, a field experiment on dust emission flux in a contaminated area (town of Namie, Fukushima prefecture), and air concentration measurements inside (Namie) and outside (city of Tsukuba, Ibaraki prefecture) the contaminated area. In order to assess the long-term effect, the full year of 2013 was selected to study just after the start of the field experiments. The Cs-137 concentrations at Namie and Tsukuba were approximately 10(-1)-1 and 10(-2)-10(-1) mBqm(-3), respectively. The observed monthly median concentration at Namie was 1 to 2 orders of magnitude larger than that at Tsukuba. This observed difference between the two sites was consistent with the simulated difference, indicating successful modeling of Cs-137 re-suspension and atmospheric transport. The estimated re-suspension rate was approximately 10(-6) day(-1), which was significantly lower than the decreasing rate of the ambient gamma dose rate in Fukushima prefecture (10(-4)-10(-3) day(-1)) as a result of radioactive decay, migration in the soil and biota, and decontamination. Consequently, re-suspension contributed negligibly in reducing ground radioactivity. The dust emission model could reproduce the air concentration of Cs-137 in winter, whereas the summer air concentration was underestimated by 1 to 2 orders of magnitude. Re-suspension from forests at a constant rate of 10(-7) h(-1), multiplied by the green area fraction, could explain the air concentration of Cs-137 at Namie and its seasonal variation. The simulated contribution of dust resuspension to the air concentration was 0.7-0.9 in the cold season and 0.2-0.4 in the warm season at both sites; the remainder of the contribution was re-suspension from forest. The re-suspension mechanisms, especially through the forest ecosystems, remain unknown. This is the first study that provides a crude estimation of the long-term assessment of radiocesium re-suspension. Additional research activities should investigate the processes/mechanisms governing the re-suspension over the long term. This could be achieved through conducting additional field experiments and numerical simulations.
  • Kotaro Katsube, Masaru Inatsu
    JOURNAL OF CLIMATE 29 (5) 1955 - 1975 0894-8755 2016/03 [Refereed][Not invited]
     
    A set of short-term experiments using a regional atmospheric model (RAM) were carried out to investigate the response of tropical cyclone (TC) tracks to sea surface temperature (SST) in the western North Pacific. For 10 selected TC cases occurring during 2002-07, a warm and a cold run are performed with 2 and -2 K added to the SSTs uniformly over the model domain, respectively. The cases can be classified into three groups in terms of recurvature: recurved tracks in the warm and cold runs, a recurved track in the warm run and a nonrecurved track in the cold run, and nonrecurved tracks in both runs. Commonly the warm run produced northward movement of the TC faster than the cold run. The rapid northward migration can be mainly explained by the result that cyclonic circulation to the west of the TC is found in the steering flow in the warm run and it is not in the cold run. The beta effect is also activated under the warm SST environment. For the typical TC cases, a linear baroclinic model experiment is performed to examine how the cyclonic circulation is intensified in the warm run. The stationary linear response to diabatic heating obtained from the RAM experiment reveals that the intensified TC by the warm SST excites the cyclonic circulation in the lower troposphere to the west of the forcing position. The vorticity and thermodynamic equation analysis shows the detailed mechanism. The time scale of the linear response and the teleconnection are also discussed.
  • Yuiko Ichikawa, Masaru Inatsu
    JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 94 (3) 257 - 267 0026-1165 2016 [Refereed][Not invited]
     
    Indices of prediction skill over the Madden-Julian oscillation (MJO) phase space are examined with reanalysis and forecast data provided by the Japan Meteorological Agency (JMA). In addition to the bivariate root-meansquare error (RMSE) and the bivariate anomaly correlation coefficient (ACC), the mean-error vector is assessed. Conventionally, the RMSE and ACC have been used, although this approach misses information on the model bias for MJO events. Moreover, the ACC is not suitable for models in which the MJO signal tends to damp in some phases, because the ACC strongly depends on the MJO amplitude. The mean-error vector compensates for this drawback by associating a model's erroneous mean tendency with the RMSE. For example, the JMA forecast produces a leftward mean error vector field uniformly distributed over the MJO phase space with its amplitude related to the RMSE. The RMSE should be then used with the mean error vector for evaluating the MJO prediction skill.
  • Masaru Inatsu, Junpei Tominaga, Yuta Katsuyama, Tomoyoshi Hirota
    SOLA 12 153 - 158 1349-6476 2016 [Refereed][Not invited]
     
    A future change in the soil-frost depth in eastern Hokkaido was assessed with multiple local climate scenarios. The bias-corrected downscaled data with an aid of a simple snow-depth model were applied to the empirical estimation from cumulative freezing degree-days (CFD) for days when the snow depth is less than 20 cm. Consequently, as the response to global warming climate that was defined as +2-K world in this paper, the maximum soil-frost depth significantly decreased in the coastal regions along the Pacific and in central Tokachi subprefecture with a slight variation among climate scenarios. Parameter-sweep experiments for two observed cases clarified that the temperature increase would bring the soil warming in the environment where the insulation effect of snow cover does not work at present, while it would bring the soil frosting in the environment where the insulation effect works.
  • Yuta Tamaki, Masaru Inatsu, Ryusuke Kuno, Naoto Nakano
    JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 94A 17 - 29 0026-1165 2016 [Refereed][Not invited]
     
    The sampling downscaling (SmDS) in which a regional atmospheric model is integrated for sampled periods was performed for summertime Hokkaido. Selected are top two and bottom two years of the general circulation model projection onto the first singular value decomposition mode where heavy precipitation in southern Hokkaido is correlated with the moisture flux convergence in the synoptic field. The SmDS result integrated for the four years successfully reproduces the dynamical downscaling for 30 years, in terms of climatological precipitation and the 99-percentile value of daily precipitation. This indicates that SmDS can be applied to the environment where local precipitation is mostly controlled by synoptic climate patterns. A further statistical consideration in this study supports the notion. It is also demonstrated that SmDS selects a group of years where extreme events likely occur another group of years where they rarely occur.
  • Masaru Inatsu, Tomonori Sato, Tomohito J. Yamada, Ryusuke Kuno, Shiori Sugimoto, Murad A. Farukh, Yadu N. Pokhrel, Shuichi Kure
    ATMOSPHERIC SCIENCE LETTERS 16 (3) 297 - 304 1530-261X 2015/07 [Refereed][Not invited]
     
    The experiments with three general circulation models (GCMs) by three regional atmospheric models (RAMs) for the dynamical downscaling (DDS) have been performed to evaluate the uncertainty in the global warming response during summertime in Hokkaido, Japan. The results of a 10-year RAM integration nested into GCM under present or future climate conditions were synthesized after applying bias correction. For the target decades during which the global-mean temperature increases by 2 K in each GCM, the DDS results indicate that surface air temperature and precipitation mostly depend on the GCM imposed as the lateral boundary condition.
  • Masaru Inatsu, Naoto Nakano, Seiichiro Kusuoka, Hitoshi Mukougawa
    JOURNAL OF THE ATMOSPHERIC SCIENCES 72 (2) 774 - 786 0022-4928 2015/02 [Refereed][Not invited]
     
    The dynamics and predictability of stratospheric low-frequency variability in the Northern Hemisphere winter are examined using a two-dimensional (2D) phase space spanned by the leading empirical orthogonal functions of the 10-hPa geopotential height field. The 2D phase space represents the variation of the strength of the polar night jet and the amplitude of zonal wavenumber-1 eddy components. A linearized nonstationary fluctuation dissipation relation (NFDR) is developed based on the deterministic drift vector and the stochastic diffusion tensor estimated from a reanalysis dataset. The authors find that the solution of the linearized NFDR with an optimal data sampling time interval for estimating the drift vector and the diffusion tensor provides a good representation in the phase space of the inhomogeneous distribution of the forecast spread of the operational ensemble forecast conducted by the Japan Meteorological Agency. In particular, the linearized NFDR captures the local maximum of the forecast spread during the onset period of the major stratospheric sudden warming events.
  • Kohei Takatama, Shoshiro Minobe, Masaru Inatsu, R. Justin Small
    JOURNAL OF CLIMATE 28 (1) 238 - 255 0894-8755 2015/01 [Refereed][Not invited]
     
    The mechanisms acting on near-surface winds over the Gulf Stream are diagnosed using 5-yr outputs of a regional atmospheric model. The diagnostics for the surface-layer momentum vector, its curl, and its convergence are developed with a clear separation of pressure adjustment from downward momentum inputs from aloft in the surface-layer system. The results suggest that the downward momentum mixing mechanism plays a dominant role in contributing to the annual-mean climatological momentum curl, whereas the pressure adjustment mechanism plays a minor role. In contrast, the wind convergence is mainly due to the pressure adjustment mechanism. This can be explained by the orientation of background wind to the sea surface temperature front. The diagnostics also explain the relatively strong seasonal variation in surface-layer momentum convergence and the small seasonal variation in curl. Finally, the surface-layer response to other western boundary currents is examined using a reanalysis dataset.
  • Yamada, T. J, M. A. Farukh, T. Fukushima, M. Inatsu, T. Sato, Y. N. Pokhrel, T. Oki
    Hydrological Research Letters 8 108 - 113 2015/01 [Refereed][Not invited]
  • Ryusuke Kuno, Masaru Inatsu
    CLIMATE DYNAMICS 43 (1-2) 375 - 387 0930-7575 2014/07 [Refereed][Not invited]
     
    This study has developed sampling downscaling (SmDS), in which dynamical downscaling (DDS) is executed for a few of period selected from a long-term integration by general circulation model based on an observed statistical relationship between large-scale climate and regional-scale precipitation. SmDS expectedly produces climatology and frequency distribution of precipitation over a nested region with reducing computational cost, if a global-scale climate pattern mostly controls regional-scale weather statistics. Here SmDS was attempted for wintertime precipitation over Hokkaido, Japan, because a linkage between snowfall and sea-level pressure patterns has been known by Japanese synopticians and it can be detected by singular value decomposition (SVD) analysis on wintertime inter-annual variability during the period from 1980/1981 to 2009/2010 for precipitation over Hokkaido and moisture flux convergence around there. DDS for the full period over the same domain was also performed for comparison with SmDS. SmDS selected two winters from the top and two winters from the bottom of the projection onto the first SVD mode. It was found that, comparing with the full DDS, SmDS indeed provided unbiased statistics for average but exaggerated extreme statistics such as heavy rainfall frequency. It was also shown that the sampling in the SmDS method was much more effective than the random sampling.
  • Peng Yang, Wenbin Wu, Zhengguo Li, Qiangyi Yu, Masaru Inatsu, Zhenhuan Liu, Pengqin Tang, Yan Zha, Masahide Kimoto, Huajun Tang
    REGIONAL ENVIRONMENTAL CHANGE 14 (1) 61 - 74 1436-3798 2014/02 [Refereed][Not invited]
     
    We studied the separate and interacting effects of changes on CO2, temperature, and precipitation on the growth and yield of winter wheat in five representative sites on the North China Plain using a crop yield simulation model, known as the Environmental Policy Integrated Climate (EPIC) model. The daily-maximum/minimum temperature and precipitation data obtained using a comprehensive climate model, that is, the Model for Interdisciplinary Research On Climate (MIROC), based on the scenario A1B for 2085-2100 were calibrated using a novel statistical algorithm and used as the climate change scenario in the EPIC model. The results indicated that an increase in the CO2 concentration of up to 680 ppm would increase the winter wheat yield by 24.8 and 43.1 % in irrigated and rainfed fields, respectively. Increases in the average maximum temperature of up to 4.9 degrees C and the average minimum temperature of up to 4.8 degrees C would increase the crop yield by 5.2 % in irrigated condition, but decrease it by 7.2 % in rainfed condition. By contrast, the yield of irrigated field decreased by 5.5 % when the annual precipitation increased by 317 mm, whereas that of rainfed field increased by 30.1 %. The interacting effects of simultaneous increases in the parameters were also simulated. With a constant CO2 level (370 ppm), the EPIC model predicted that the effects of temperature and precipitation on yield would be -0.9 and -1.9 % for irrigated and rainfed fields, respectively. When the CO2 level increased to 680 ppm, the interacting effect of elevated CO2, temperature, and precipitation increased the average yield by ca 23.1 % with the irrigated treatment and by ca 27.7 % with the rainfed treatment. The results also indicated that with a climate change scenario, the temperature-stress days decreased during the period of winter wheat growth whereas the nitrogen-stress days increased significantly in the North China Plain. These simulated separate and interaction simulations may be useful for identifying appropriate management or genotype adaptations of winter wheat to cope with a climate change scenario in the North China Plain.
  • Masaru Inatsu, Satoshi Kobayashi, Shinji Takeuchi, Anna Ohmori
    SOLA 10 172 - 175 1349-6476 2014 [Refereed][Not invited]
     
    Birch pollen mainly causes springtime allergy-related diseases, birch pollinoses, widely known in high-latitude countries. By utilizing the observation in Sapporo from 2001 to 2011, we found that the daily pollen amount almost follows the log-normal distribution with its characteristic time-scale of several days. The pollen amount itself was therefore taken as a major predictor for its day-to-day variations. Another predictor was chosen from climatic variables that were possibly related to the pollen amount such as temperature, rainfall, sunshine duration, wind, relative humidity, rainfall, and daily temperature difference to explain daily variations of the pollen amount. A resulting statistical equation with two independent predictors of lagged pollen amount and diurnal temperature range based on the multiple regression analysis provided a reasonable hindcast prediction with the correlation coeffcient with observation being 0.80. Moreover, the equation was better fitted to the observations in abundant years than in poor-yield years.
  • Masaru Inatsu, Tsubasa Nakayama, Yoshie Maeda, Hirotaka Matsuda
    Journal of Disaster Research 9 (4) 412 - 421 1883-8030 2014 [Refereed][Not invited]
     
    Dynamical downscaling (DDS), in which a regional atmospheric model (RAM) experiment nested into coarser-resolution data provides a spatio-temporal fine dataset for a particular region, was performed to assess the present climate in Ghana. The DDS successfully evaluated realistic seasonal march and inter-annual variability in rainfall, in comparison with gauge and satellite observation. The DDS also indicated that land-lake and land-sea circulation interacted with the West African monsoon likely characterized the local climate in Ghana.
  • Masaru Inatsu, Shotaro Amada
    JOURNAL OF CLIMATE 26 (21) 8641 - 8653 0894-8755 2013/11 [Refereed][Not invited]
     
    This study shows that the morphological characteristics of upper-tropospheric extratropical eddies are closely related to the background flow in the Northern Hemisphere winter. Enclosed surfaces of 300-hPa relative vorticity are identified by using the neighbor enclosed area tracking algorithm, and the periphery of these surfaces are approximated by ellipses. Eddies are classified into five categories according to the approximate ellipse. Eddies having an oblateness of less than 0.6 are classified as near circle, or are otherwise classified as northeast-southwest (NE-SW), northwest-southeast (NW-SE), north-south, or west-east, according to the direction of the major axis. In the wintertime climatology, NE-SW-oriented cyclones are collocated with the jet stream, while NW-SE-oriented cyclones mostly reside north of the jet. In interannual variability, moreover, the frequency of NE-SW cyclones is slightly correlated with the Arctic Oscillation (AO) index, while the frequency of NW-SE cyclones is highly anticorrelated with the AO index. This is consistent with positive feedback between horizontally slanted eddies and background flow, as has been shown in many previous studies.
  • Yuya Satake, Masaru Inatsu, Masato Mori, Akira Hasegawa
    MONTHLY WEATHER REVIEW 141 (10) 3539 - 3555 0027-0644 2013/10 [Refereed][Not invited]
     
    Tropical cyclone (TC) tracking is essential for calculating TC statistics from gridded datasets. A new method for TC tracking is presented here using neighbor enclosed area tracking (NEAT), which is based on the temporal overlap of enclosed areas above a vorticity threshold and differs from the widely used neighbor point tracking (NPT) method. The parameters of cyclone intensity, vertical-shear, and warm-core criteria were intensively tuned for NEAT and NPT. When these criteria were optimized for the typhoon tracks observed in the western North Pacific based on the Japanese 25-yr Reanalysis Project (JRA-25)/Japan Meteorological Agency (JMA) Climate Data Assimilation System (JCDAS) dataset, the NEAT and NPT algorithms captured approximately 85% of typhoons with little qualitative distortion in the spatial distribution and temporal variability of the TC track density. The grid system dependency of the algorithms was tested by applying NEAT and NPT to a high-resolution general circulation model output. The method presented here can also provide realistic statistics on the TC size, the extratropical transition timing, and the meridional heat transport.
  • Urs Neu, Mirseid G. Akperov, Nina Bellenbaum, Rasmu S. Benestad, Richard Blender, Rodrigo Caballero, Angela Cocozza, Helen F. Dacre, Yang Feng, Klaus Fraedrich, Jens Grieger, Sergey Gulev, John Hanley, Tim Hewson, Masaru Inatsu, Kevin Keay, Sarah F. Kew, Ina Kindem, Gregor C. Leckebusch, Margarida L. R. Liberato, Piero Lionello, Igor I. Mokhov, Joaquim G. Pinto, Christoph C. Raible, Marco Reale, Irina Rudeva, Mareike Schuster, Ian Simmonds, Mark Sinclair, Michael Sprenger, Natalia D. Tilinina, Isabel F. Trigo, Sven Ulbrich, Uwe Ulbrich, Xiaolan L. Wang, Heini Wernli
    BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY 94 (4) 529 - 547 0003-0007 2013/04 [Refereed][Not invited]
  • Masaru Inatsu, Naoto Nakano, Hitoshi Mukougawa
    JOURNAL OF THE ATMOSPHERIC SCIENCES 70 (3) 939 - 952 0022-4928 2013/03 [Refereed][Not invited]
     
    Dynamics and practical predictability of extratropical low-frequency variability (LFV) in Northern Hemisphere winter are examined in the framework of a two-dimensional (2D) stochastic differential equation (SDE) on the phase space spanned by two leading empirical orthogonal function modes of low-pass-filtered 500-hPa geopotential height variations. The drift vector and diffusion tensor of the 2D SDE with multiplicative noise are theoretically connected with deterministic and stochastic error growth, respectively; both are statistically estimated from a reanalysis dataset. Projected onto the 2D phase space is the practical predictability of the LFV estimated by the 10-day forecast spread based on the 1-month ensemble prediction operationally conducted by the Japan Meteorological Agency (JMA). It is shown that the forecast spread of the LFV prediction by the JMA model for a relatively shorter prediction period when the model bias does not hamper the forecast is primarily explained by the stochastic error growth associated with the diffusion tensor and the deterministic error growth due to the Jacobian of the drift vector plays a secondary role. A non-Gaussian PDF of the LFV is also related to the norm of the diffusion tensor. Hence, the stochastic processes mostly control the dynamics and predictability of the LFV in the 2D phase space.
  • Uwe Ulbrich, Gregor C. Leckebusch, Jens Grieger, Mareike Schuster, Mirseid Akperov, Mikhail Yu. Bardin, Yang Feng, Sergey Gulev, Masaru Inatsu, Kevin Keay, Sarah F. Kew, Margarida L. R. Liberato, Piero Lionello, Igor I. Mokhov, Urs Neu, Joaquim G. Pinto, Christoph C. Raible, Marco Reale, Irina Rudeva, Ian Simmonds, Natalia D. Tilinina, Isabel F. Trigo, Sven Ulbrich, Xiaolan L. Wang, Heini Wernli
    METEOROLOGISCHE ZEITSCHRIFT 22 (1) 61 - 68 0941-2948 2013/02 [Refereed][Not invited]
     
    For Northern Hemisphere extra-tropical cyclone activity, the dependency of a potential anthropogenic climate change signal on the identification method applied is analysed. This study investigates the impact of the used algorithm on the changing signal, not the robustness of the climate change signal itself. Using one single transient AOGCM simulation as standard input for eleven state-of-the-art identification methods, the patterns of model simulated present day climatologies are found to be close to those computed from re-analysis, independent of the method applied. Although differences in the total number of cyclones identified exist, the climate change signals (IPCC SRES A1B) in the model run considered are largely similar between methods for all cyclones. Taking into account all tracks, decreasing numbers are found in the Mediterranean, the Arctic in the Barents and Greenland Seas, the mid-latitude Pacific and North America. Changing patterns are even more similar, if only the most severe systems are considered: the methods reveal a coherent statistically significant increase in frequency over the eastern North Atlantic and North Pacific. We found that the differences between the methods considered are largely due to the different role of weaker systems in the specific methods.
  • Koki Iwao, Masaru Inatsu, Masahide Kimoto
    JOURNAL OF CLIMATE 25 (20) 7282 - 7296 0894-8755 2012/10 [Refereed][Not invited]
     
    This study investigated recent changes in the characteristics of explosively developing extratropical cyclones over the northwestern Pacific region in winter from 1979/80 to 2010/11 by using reanalysis data from the Japanese 25-yr Reanalysis/Japan Meteorological Agency Climate Data Assimilation System (JRA-25/JCDAS). The results showed that the frequency of explosive cyclones increased in the northwestern Pacific region east of Japan. This increase was accompanied by a decrease in the number of slowly developing cyclones, indicating an increase in the cyclone growth rate. Moreover, most of the increased explosive cyclones east of Japan originated southwest of Japan. A comparison of the dynamical features and energy budgets of two composite cyclones in the earlier and later halves of the study period suggested that the increase was due to an enhancement of the low-level baroclinicity to the east of Japan and an increase in humidity associated with sea surface temperature warming and enhanced evaporation along the eastern shore of the Asian continent.
  • Yoshi N. Sasaki, S. Minobe, T. Asai, M. Inatsu
    JOURNAL OF CLIMATE 25 (19) 6627 - 6645 0894-8755 2012/10 [Refereed][Not invited]
     
    Influence of the Kuroshio in the East China Sea on the baiu rainband is examined using satellite observations, a reanalysis dataset, and a regional atmospheric model from 2003 to 2008. Satellite observations and reanalysis data reveal that precipitation over the Kuroshio is the highest in early summer (June), when the baiu rainband covers the East China Sea. The high rainfall is collocated with the warm sea surface temperature (SST) tongue of the Kuroshio. This locally enhanced precipitation is embedded in the large-scale baiu rainband, so that the amplitude of precipitation over the Kuroshio is twice as large as that in its surrounding area. The Kuroshio is also accompanied by high surface wind speed, energetic evaporation, and wind convergence. This wind convergence likely results from the SST influence on atmospheric pressure through not only temperature changes, but also humidity changes. Furthermore, the Kuroshio anchors the ascent motion and large diabatic heating with a peak in the midtroposphere, suggesting that the influence of the Kuroshio extends to the upper troposphere. It is also found that the East China Sea in June is the region of the strongest deep atmospheric response to western boundary currents along with the Gulf Stream region in summer. The observational results are well reproduced by the regional atmospheric model. The model indicates that when the SST tongue of the Kuroshio is smoothed, the enhanced precipitation, the energetic evaporation, and the wind convergence over the Kuroshio disappear, although the large-scale structure of the baiu rainband is not essentially changed.
  • Masaru Inatsu, Kazutaka Terakura
    CLIMATE DYNAMICS 38 (11-12) 2307 - 2317 0930-7575 2012/06 [Refereed][Not invited]
     
    Data analysis and regional atmospheric model (RAM) experiments revealed key factors in the control of wintertime cyclone passage routes from Northeast Asia to the western North Pacific. The cyclone routes were independent of the global flow pattern in the interannual variability, while cyclone growth closely agreed with linear baroclinic theory. The RAM experiments with a different lateral boundary condition composed of a combination of monthly mean and transient components also showed that the upstream eddies are important for the track route, but the background states are not. Additionally, the RAM experiments showed that the mean flow controlled the growth rate of cyclones.
  • Masaru Inatsu, Yuya Satake, Masahide Kimoto, Natsuko Yasutomi
    JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN 90B 1 - 10 0026-1165 2012/03 [Refereed][Not invited]
     
    Accurate simulation of summertime convection associated with the Asian monsoon trough over the subtropical western Pacific is important but difficult to achieve in many general circulation models (GCMs). This study reports a case in which bias could be reduced by introducing a higher-resolution regional atmospheric model (RAM), two-way nested in an atmospheric GCM over the western Pacific. Additional partial-coupling experiments revealed that GCM bias correction was insensitive to the coupling domain. The two-way nesting effect was similar to one phase of a leading mode of natural variability in the system. This is indicative that the two-way nesting model provides more realistic tropical heating that effectively excites a correct phase of the intrinsic dynamical mode to reduce GCM bias.
  • Kohei Takatama, Shoshiro Minobe, Masaru Inatsu, R. Justin Small
    ATMOSPHERIC SCIENCE LETTERS 13 (1) 16 - 21 1530-261X 2012/01 [Refereed][Not invited]
     
    This study proposes a novel diagnostics for near-surface wind responses to oceanic fronts. By separating two roles of wind stress, i.e. downward momentum input and the surface friction, the diagnostics can express near-surface winds as a sum of terms relating to pressure adjustment, downward momentum mixing, and horizontal advection. The diagnostics are applied to the climatological wind convergence/divergence over the Gulf Stream obtained from a regional atmospheric model. It is found that the pressure adjustment plays a primary role and is mainly responsible for the convergence, while the downward momentum mixing is a secondary contributing factor to the divergence. Copyright (c) 2011 Royal Meteorological Society
  • Masaru Inatsu
    ATMOSPHERIC SCIENCE LETTERS 10 (4) 267 - 272 1530-261X 2009/10 [Refereed][Not invited]
     
    The neighbor enclosed area tracking (NEAT) algorithm is proposed as an alternative method to conventional point-to-point cyclone tracking approaches. NEAT enables us to count the genesis and tracks of individual cyclones as well as the number of merged and separated cyclones. Little difference in cyclone genesis or track climatology in the Northern Hemisphere was found between NEAT and conventional tracking. The NEAT results indicate a high probability of cyclone merger in the western Pacific and western Atlantic. Composite maps and backtracking from merged cyclones reveal the characteristics of merged cyclones. Copyright. (C) 2009 Royal Meteorological Society
  • Masaru Inatsu, Masahide Kimoto
    MONTHLY WEATHER REVIEW 137 (9) 2851 - 2868 0027-0644 2009/09 [Refereed][Not invited]
     
    This study newly developed the interactively nested climate model (INCL) using a general circulation model (GCM) interactively nested with a regional atmospheric model (RAM). One interactive experiment with finer RAM topography and another with coarser topography, as well as offline versions of each experiment, were performed to investigate the effects of subsynoptic-scale eddies and subsynoptic-scale mountains in northeast Asia on the larger-scale climate, using the GCM with T42 atmosphere and the RAM with 40-km mesh size in the INCL system. The subsynoptic-scale eddy effect restrictively increased synoptic-scale eddy activity within the RAM domain. In contrast, subsynoptic-scale mountains had the effect of robust anticyclonic circulation around the Sea of Japan and effectively forced larger-scale circulation. The effect was positively fed back to the mean field and amplified the anticyclonic circulation accompanied by suppressed storm activity in northeast Asia. The results suggest that subsynoptic-scale mountains affect not only subsynoptic-scale eddies but also the global climate.
  • Masaru Inatsu, Masahide Kimoto, Akimasa Sumi
    SOLA 3 105 - 108 1349-6476 2007 [Refereed][Not invited]
     
    Stratospheric sudden warming (SSW) in association with projected global warming (GW) in the Northern Hemisphere was investigated by 20th-century and 21st-century simulations (20CS and 21CS) using the atmosphere-ocean coupled general circulation model. Composite analysis revealed that the model simulated 20th-century dynamical aspects of SSW well. Although SSW events in early winter are missing, considering difficulties in reasonable SSW simulation, we regard the 20CS results as reference values. The 21CS suggests that forcing by GW increases the number of both major and minor SSW events in Dec, Jan, and early Feb, in correlation with larger eddy heat flux (EHF) at 100 hPa in Nov, Dec, and early Jan. The increase of the flux mainly originates from tropospheric stationary wave response. The greater flux continues until early Jan and then the polar night jet is much more weakened in Feb. This background state then effectively blocks wave propagation into the stratosphere and the EHF at 100 hPa slightly decreases though the difference is not statistically significant. The major SSW events decreases in Mar.
  • Masaru Inatsu, Brian J. Hoskins
    Journal of the Meteorological Society of Japan 84 (3) 433 - 445 0026-1165 2006/06 [Refereed][Not invited]
     
    The seasonal and wintertime interannual variability of the split jet and the storm-track activity minimum near New Zealand (NZ) have been examined based upon the European Centre for Medium Range Weather Forecast Reanalysis (ERA-40) 1979-2001 daily data. Using the split jet index defined in this paper, the climatological variation in the split jet is closely related to the storm-track activity minimum. In austral winter, the split jet is located near NZ along with the storm-track activity minimum, which is established by the climatological Rossby wave forced by the cross-equatorial flow in the Indian Ocean. In austral spring and autumn, in contrast, both the NZ split jet and the storm-track activity minimum are less clear in the absence of the Rossby wave, because of the near-zero Indian Ocean cross-equatorial flow. However, interannual variation in the wintertime Indian Ocean cross-equatorial flow is only weakly associated with interannual variability in the split jet, the correlation being 0.14. The interannual variation in the cross-equatorial flow further east, in the Indonesian region, shows a higher correlation of 0.29. The middle and higher latitude components of the split jet structure are more strongly related to the zonally asymmetric part of the Antarctic Oscillation. An index for this has a 0.43 correlation on interannual time scales with the split jet index. Other processes must also be important for the interannual variability of the split jet and storm-track activity minimum in the NZ region. It is hypothesized that blocking in that region may be of particular importance. © 2006, Meteorological Society of Japan.
  • 南半球冬季ストームトラックの東西非対称性の形成について~2005年度山本・正野論文賞記念講演~
    稲津將
    天気 53 537 - 549 2005/09 [Refereed][Not invited]
  • Inatsu, M, M. Kimoto
    Scientific Online Letters on the Atmosphrer 1 61 - 64 2005/06 [Refereed][Not invited]
  • Masaru Inatsu, Masahide Kimoto
    SOLA 1 105 - 108 1349-6476 2005 [Refereed][Not invited]
     
    Effects of atmosphere-ocean coupling have been investigated using the CCSR/NIES/FRCGC coupled and atmospheric general circulation models (CGCM and AGCM). The latter is integrated with monthly sea surface temperatures (SSTs) taken from the former. The given SSTs being independent of the atmospheric fluctuations, the AGCM supplies more water vapor to the atmosphere to adjust larger air-sea temperature difference. In our AGCM, the summertime land temperatures are higher due to greater greenhouse effect, because the change of the cloud amount is too small to affect the radiative fluxes. More evaporation induces stronger rainfall in some regions, and circulation and moisture distribution control the horizontal distribution of rainfall. Hence the coupling effect in rainfall distribution could change if the climate condition changed. As an example in our model, the decoupling does not affect Japanese summer rainfall under the preindustrial condition but strengthens it under the global warming condition.
  • M Inatsu, BJ Hoskins
    JOURNAL OF CLIMATE 17 (24) 4882 - 4892 0894-8755 2004/12 [Refereed][Not invited]
     
    Atmospheric general circulation model experiments have been performed to investigate how the significant zonal asymmetry in the Southern Hemisphere ( SH) winter storm track is forced by sea surface temperature ( SST) and orography. An experiment with zonally symmetric tropical SSTs expands the SH upper-tropospheric storm track poleward and eastward and destroys its spiral structure. Diagnosis suggests that these aspects of the observed storm track result from Rossby wave propagation from a wave source in the Indian Ocean region associated with the monsoon there. The lower-tropospheric storm track is not sensitive to this forcing. However, an experiment with zonally symmetric midlatitude SSTs exhibits a marked reduction in the magnitude of the maximum intensity of the lower-tropospheric storm track associated with reduced SST gradients in the western Indian Ocean. Experiments without the elevation of the South African Plateau or the Andes show reductions in the intensity of the major storm track downstream of them due to reduced cyclogenesis associated with the topography. These results suggest that the zonal asymmetry of the SH winter storm track is mainly established by stationary waves excited by zonal asymmetry in tropical SST in the upper troposphere and by local SST gradients in the lower troposphere, and that it is modified through cyclogenesis associated with the topography of South Africa and South America.
  • M Inatsu, H Mukougawa, SP Xie
    JOURNAL OF CLIMATE 16 (20) 3314 - 3329 0894-8755 2003/10 [Refereed][Not invited]
     
    Midwinter storm track response to zonal variations in midlatitude sea surface temperatures (SSTs) has been investigated using an atmospheric general circulation model under aquaplanet and perpetual-January conditions. Zonal wavenumber-1 SST variations with a meridionally confined structure are placed at various latitudes. Having these SST variations centered at 30degreesN leads to a zonally localized storm track, while the storm track becomes nearly zonally uniform when the same SST forcing is moved farther north at 408 and 50degreesN. Large (small) baroclinic energy conversion north of the warm (cold) SST anomaly near the axis of the storm track (near 40degreesN) is responsible for the large (small) storm growth. The equatorward transfer of eddy kinetic energy by the ageostrophic motion and the mechanical damping are important to diminish the storm track activity in the zonal direction. Significant stationary eddies form in the upper troposphere, with a ridge (trough) northeast of the warm (cold) SST anomaly at 30degreesN. Heat and vorticity budget analyses indicate that zonally localized condensational heating in the storm track is the major cause for these stationary eddies, which in turn exert a positive feedback to maintain the localized storm track by strengthening the vertical shear near the surface. These results indicate an active role of synoptic eddies in inducing deep, tropospheric-scale response to midlatitude SST variations. Finally, the application of the model results to the real atmosphere is discussed.
  • M Inatsu, H Mukougawa, SP Xie
    JOURNAL OF THE ATMOSPHERIC SCIENCES 59 (11) 1898 - 1915 0022-4928 2002/06 [Refereed][Not invited]
     
    A set of atmospheric general circulation model (AGCM) experiments under idealized conditions is performed to investigate atmospheric response to surface boundary forcing by extratropical land-sea contrast, large-scale orography, and tropical sea surface temperature (SST) distribution. Stationary eddies forced by the extratropical land-sea distribution are strongest in high latitudes, but their amplitudes are modest and comparable to internal chaotic variability. By contrast, the stationary eddy response to zonal variations in tropical SST is strong and robust in both the subtropics and midlatitudes. While these SST-forced stationary waves are trapped within the troposphere, those induced by orography show a strong vertical propagation into the stratosphere. Analysis of transient eddies indicates that orography is effective in generating a zonally localized storm track while extratropical land-sea contrast has little effect on the zonal variation of upper-level storm activity. A vorticity budget analysis is carried out to understand tropical SST forcing mechanism to set up extratropical stationary eddies. In the subtropics, the dominant balance is reached between the vortex stretching and zonal advection. North of the tropical warm water pool, a subtropical anticyclone forms in the upper troposphere in response to the divergence of the locally enhanced Hadley circulation. The authors further show that this subtropical response to tropical SST variations has nonlinear characteristics in both its amplitude and zonal phase.
  • Masaru Inatsu, Hitoshi Mukougawa, Shang-Ping Xie
    Journal of the Meteorological Society of Japan 80 (4 B) 1069 - 1076 0026-1165 2002 [Refereed][Not invited]
     
    Effects of zonal variations in sea surface temperature (SST) on synoptic eddy activity are examined using an atmospheric general circulation model under the perpetual January and the aqua-planet conditions. In the presence of zonal variations in tropical SST, upper tropospheric zonal wind displays large zonal asymmetry and the storm track is located downstream of the maximum westerly speed. When only extratropical SST varies in the east-west direction, a storm track develops along the sharp meridional SST gradient despite a nearly zonally uniform westerly jet in the upper troposphere. The latter result suggests that zonal variations in upper tropospheric westerlies contribute to but are not necessary for zonally confined storm tracks.
  • Masaru Inatsu, Hitoshi Mukougawa, Shang-ping Xie
    [Refereed][Not invited]
     
    Abstract. In boreal winter, subtropical westerlies in the upper troposphere reach maxima in speed over the eastern edges of the Asian and North American continents. The zonal variations in the westerlies are generally attributed to large-scale orography and thermal forcing, but the latter mechanism remains largely unsubstantiated. Here we conduct general circulation model (GCM) experiments without orography to identify the most important thermal forcing for generating zonal asymmetries in subtropical westerlies. By changing sea surface temperature (SST) distribution in the GCM, we find that the tropical SST distribution plays a decisive role in producing a subtropical jet core to the north of the tropical warm water pool, while the effects of extratropical continent-ocean heating contrast on upper-level zonal wind speed distribution are secondary. The results from Aqua Planet runs further support this conclusion. 1.

Books etc

  • 解ける!使える!微分方程式
    稲津將 
    北海道大学出版会 2016
  • 天気と気象についてわかっていることいないこと
    在田一則, 竹下徹, 見延庄士郎, 渡部重人編 (Contributor第1章)
    ベレ出版 2013
  • 地球惑星科学入門
    筆保弘徳, 芳村圭編 (Contributor第19章、第20章)
    北海道大学出版会 2010

Conference Activities & Talks

  • 札幌における高解像度シラカバ花粉飛散シミュレーション (1) シラカバ樹木分布図作成  [Not invited]
    吉田 遼, 稲津 將, 武内 伸治, 小林 智
    日本気象学会北海道支部第2回研究発表会  2017/12
  • 札幌における高解像度シラカバ花粉飛散シミュレーション (1) シラカバ樹木分布図作成  [Not invited]
    吉田 遼, 稲津 將, 武内 伸治, 小林 智
    花粉学会  2017/09
  • Characteristics of Aleutian eddy and its impact on Chlorophyll distribution  [Not invited]
    Ishiyama, H, U. Hiromichi, M. Inatsu
    PICES  2017/09
  • 北半球冬季のブロッキング形成過程における再解析および予報データに対する渦度収支解析  [Not invited]
    相河卓哉, 稲津將
    日本気象学会北海道支部第1回研究発表会  2017/07
  • 夏季九州における力学的ダウンスケーリングの強降水継続時間のバイアスとそれに関係する総観場  [Not invited]
    玉置雄大, 稲津將, Nguyen-Le Dzung, 山田朋人
    日本気象学会春季大会  2017/05
  • パーシステント・ホモロジーによる低気圧・前線トラッキング  [Not invited]
    稲津 將, 加藤颯人, 平岡裕章, 大林一平
    日本気象学会春季大会  2017/05
  • Response of Tropical Cyclone Tracks to Sea Surface Temperature in the Western North Pacific  [Not invited]
    Inatsu, M, K. Katsube
    AGU  2016/12
  • 台風の強度と経路に関する海面水温のみの効果の抽出  [Not invited]
    稲津將
    日本農業気象学会北海道支部大会  2016/12
  • Global warming response of snowpack at a site in northern Japan estimated using multiple dynamically downscaled data  [Not invited]
    Katsuyama, Y, M. Inatsu, K. Nakamura, S. Matoba
    AGU  2016/12
  • 北太平洋における海面水温が台風経路に及ぼす影響  [Not invited]
    稲津將
    台風研究会  2016/11
  • 海道における原子力防災対策  [Not invited]
    稲津將
    第57回大気環境学会年会  2016/09
  • Long-term assessment of airborne radio-cesium after the Fukushima nuclear accident: re-suspension from soil and vegetation and the premises of the power plant  [Not invited]
    Kajino, M, M. Ishizuka, Y. Igarashi, K. Kita, C. Yoshikawa, M. Inatsu
    European Aerosol Conference  2016/09
  • 平洋における海面水温が台風経路に及ぼす影響  [Not invited]
    稲津 將, 勝部 弘太郎
    日本気象学会北海道支部第1回研究発表会  2016/06
  • 複数の力学的ダウンスケーリングに基づくニセコにおける積雪の将来変化  [Not invited]
    勝山祐太, 稲津 將, 中村一樹
    日本気象学会北海道支部第1回研究発表会  2016/06
  • Long-term assessment of airborne radio-cesium after the Fukushima nuclear accident: re-suspension from soil and vegetation and the premises of the power plant  [Not invited]
    Kajino, M, M. Ishizuka, Y. Igarashi, K. Kita, C. Yoshikawa, M. Inatsu
    Goldschmidt 2016  2016/06
  • 原発事故由来の放射性セシウム大気濃度の長期解析:土壌、植物からの再飛散  [Not invited]
    梶野瑞王, 石塚雅秀, 五十嵐康人, 北和之, 吉川知里, 稲津將
    日本地球惑星科学連合大会  2016/05
  • Methods to evaluate prediction skill in the Madden-Julian oscillation phase space  [Not invited]
    Ichikawa, Y, M. Inatsu
    JpGU  2016/05
  • 北太平洋における海面水温が台風経路に及ぼす影響  [Not invited]
    稲津 將, 勝部 弘太郎
    日本気象学会2016年度春季大会  2016/05
  • 力学的ダウンスケーリングに基づく北海道東部における年最大土壌凍結深の将来予測  [Not invited]
    稲津 將, 冨永純平, 勝山祐太, 廣田知良
    日本気象学会2016年度春季大会  2016/05
  • Long-term assessment of airborne radio-cesium after the Fukushima nuclear accident: re-suspension from soil and vegetation and the premises of the power plant  [Not invited]
    Kajino, M, M. Ishizuka, Y. Igarashi, K. Kita, C. Yoshikawa, M. Inatsu
    EGU  2016/04
  • Response of tropical cyclone tracks to sea surface temperature in western North Pacific  [Not invited]
    Inatsu, M, K. Katsube
    EGU  2016/04
  • ntercomparison of mid latitude storm diagnostics (IMILAST) ? overview of project results  [Not invited]
    Neu, U, Coauthors
    EGU  2016/04
  • Sampling downscaling method and its application to Hokkaido summer climate  [Not invited]
    Tamaki, Y, M. Inatsu, N. Nakano, R. Kuno
    EGU  2016/04
  • 力学的ダウンスケーリングに基づく北海道東部における年最大土壌凍結深の将来予測  [Not invited]
    冨永純平, 稲津將, 廣田知良
    日本農業気象学会北海道支部大会  2015/12
  • Response of tropical cyclone tracks to sea surface temperature in western North Pacific  [Not invited]
    Inatsu, M, K. Katsube
    Satellite Session of 18th SNU-HU joint symposium  2015/11
  • 北海道ニセコにおける地球温暖化による積雪変化の推定  [Not invited]
    勝山祐太, 稲津 將, 中村一樹
    日本雪氷学会雪氷研究大会  2015/09
  • Application of a topological-computation method to meteorological data  [Not invited]
    森田 英俊, 稲津 將, 國府 寛司
    2015年日本応用数理学会年会  2015/09
  • 確率微分方程式を用いた成層圏・対流圏の予測可能性の解析  [Not invited]
    稲津 將, 中野直人, 楠岡誠一郎, 向川均
    日本応用数理学会  2015/09
  • RECCA北海道「近未来ビューワ」の開発と公開  [Not invited]
    小松麻美, 小倉勉, 松岡直基, 佐藤隆光, 山田朋人, 稲津將, 佐藤友徳
    土木学会地球環境シンポジウム  2015/09
  • 北海道における降水量予測値による土壌流亡量  [Not invited]
    鵜木啓二, 山田朋人, 稲津 將, 佐藤友徳, 松岡直基, 中村和正
    農業農村工学会  2015/09
  • 気象学の色遣い  [Not invited]
    稲津 將, 濱田 篤
    日本気象学会北海道支部第1回研究発表会  2015/06
  • 北海道における気候変動適応研究のための水文・気象ダウンスケールデータの情報公開ツール「近未来ビューワ」の開発  [Not invited]
    小松麻美, 小倉勉, 松岡直基, 佐藤隆光, 山田朋人, 稲津將, 佐藤友徳
    日本気象学会2015年度春季大会  2015/05
  • 確率微分方程式を用いた成層圏・対流圏の予測可能性の解析  [Not invited]
    稲津 將
    日本気象学会2015年度春季大会  2015/05
  • 確率微分方程式モデルを用いたベクトル時系列データ解析におけるアンサンブル予測可能性評価  [Not invited]
    中野直人, 稲津將, 楠岡誠一郎, 齊木吉隆
    日本数学会2015年会  2015/03
  • 確率微分方程式モデルを用いたベクトル時系列データ解析における予測可能性評価  [Not invited]
    中野直人, 稲津將, 楠岡誠一郎, 齊木吉隆
    応用数学合同研究集会  2014/12
  • Global distributions of merger and split of oceanic mesoscale eddies  [Not invited]
    Ishiyama, H, H. Ueno, M. Inatsu, S. Itoh
    AGU  2014/12
  • 非定常揺動散逸定理による冬季成層圏循環の予測可能性  [Not invited]
    稲津 將, 中野直人, 楠岡誠一郎, 向川均
    日本気象学会2014年度秋季大会  2014/10
  • 海道における夏季気候変動に関するマルチGCM×マルチRAM実験により力学的ダウンスケーリング  [Not invited]
    稲津 將, 佐藤友徳, 山田朋人, 久野龍介, 杉本志織, M. A. Farukh, Yadu N. Pokhrel, 呉修一
    日本気象学会2014年度秋季大会  2014/10
  • 全球における海洋中規模渦の合併と分裂  [Not invited]
    石山 宙夢, 上野 洋路, 稲津 將, 伊藤幸彦
    日本海洋学会2014年度秋季大会  2014/09
  • Development of sampling downscaling  [Invited]
    Inatsu Masaru
    AOGS,  2014/08
  • Development and Application of Comprehensive Downscaling Methods for Hokkaido Region  [Invited]
    Yamada, T. J, M. Inatsu, T. Sato, K. Nakamura, S. Sugimoto, M. Farukh, A. Komatsu, N. Matsuoka
    AOGS  2014/07
  • Sampling downscaling method and its application to Hokkaido summer climate  [Not invited]
    Tamaki, Y, M. Inatsu, N. Nakano, R. Kuno
    21st Century Challenges in Regional Climate Modelling  2014/06
  • 非定常揺動散逸定理による冬季成層圏循環の予測可能性  [Not invited]
    稲津 將, 中野直人, 楠岡誠一郎, 向川均
    日本気象学会北海道支部2014年度第1回研究発表会  2014/06
  • 北海道における夏季気候変動に関するマルチGCM×マルチRAM実験により力学的ダウンスケーリング  [Not invited]
    稲津 將, 佐藤友徳, 山田朋人, 久野龍介, 杉本志織, M. A. Farukh, Yadu N. Pokhrel, 呉修一
    日本気象学会北海道支部2014年度第1回研究発表会  2014/06
  • 気象庁1か月予報によるマッデン・ジュリアン振動の予測可能性  [Not invited]
    市川 悠衣子, 稲津 將
    日本気象学会北海道支部2014年度第1回研究発表会  2014/06
  • 北海道における豪雨・豪雪の再現性に対する多段ネストの効果  [Not invited]
    稲津 將, 高橋良輔
    日本気象学会2014年度春季大会  2014/05
  • ガーナにおける気象情報の空間詳細化  [Not invited]
    中山 翼, 稲津 將, 松田 浩敬, 前田 芳恵
    日本気象学会2014年度春季大会  2014/05
  • 海面水温を変えた熱帯低気圧の温帯低気圧化の数値実験  [Not invited]
    勝部 弘太郎, 稲津 將
    日本気象学会2014年度春季大会  2014/05
  • 夏季北海道におけるサンプリングダウンスケーリング  [Not invited]
    玉置雄大, 稲津將, 久野龍介, 中野直人
    日本気象学会2014年度春季大会  2014/05
  • 札幌におけるシラカバ花粉の日飛散量の重回帰予測  [Not invited]
    稲津 將, 小林 智, 武内 伸治, 大森 杏奈
    日本気象学会2014年度春季大会  2014/05
  • 気象庁1 か月予報におけるマッデンジュリアン振動の予測可能性  [Not invited]
    市川悠衣子, 稲津 將
    日本気象学会2014年度春季大会  2014/05
  • Conley-Morseグラフの方法による気象ダイナミクスの時系列データ解析  [Not invited]
    森田 英俊, 稲津 將, 國府 寛司
    2013年度物理学会  2014/03
  • Application of a topological-computation method to meteorological data  [Not invited]
    森田 英俊, 稲津 將, 國府 寛司
    2013年度応用数学合同研究集会  2013/12
  • 多段ネストによる北海道の豪雪事例の再現性の検証  [Not invited]
    高橋 良輔, 稲津 將
    農業気象学会北海道支部2013年度大会  2013/11
  • Dynamics and practical predictability of extra-tropical wintertime low-frequency variability in a low-dimensional system.  [Invited]
    Inatsu, M, N. Nakano, H. Mukougawa
    RIMS International Conference on Theoretical Aspects of Variability and Predictability in Weather and Climate Systems.  2013/10
  • Mixture of dynamical downscaling and statistical downscaling  [Invited]
    Inatsu, M, R. Kuno, N. Nakano
    2013/10
  • 確率微分方程式を用いた時系列解析における統計的係数決定公式と軌道の予測可能性  [Not invited]
    中野 直人, 斉木 吉隆, 稲津 將, 楠岡 誠一郎
    日本数学会2013年度秋期総合分科会  2013/09
  • 北太平洋における海洋中規模渦の合併と分裂  [Not invited]
    石山 宙夢, 上野 洋路, 稲津 將
    日本海洋学会2013年度秋季大会  2013/09
  • ガーナにおける気象情報の空間詳細化  [Not invited]
    中山 翼, 稲津 將
    日本気象学会北海道支部2013年度第1回研究発表会  2013/06
  • 多段ネストによる北海道の豪雪事例の再現性の検証  [Not invited]
    高橋 良輔, 稲津 將
    日本気象学会北海道支部2013年度第1回研究発表会  2013/06
  • 海面水温を変えた熱帯低気圧の温帯低気圧化の数値実験  [Not invited]
    勝部 弘太郎, 稲津 將
    日本気象学会北海道支部2013年度第1回研究発表会  2013/06
  • 時系列データに対する確率微分方程式モデルの統計的係数決定公式と軌道の予測可能性について  [Not invited]
    中野 直人, 斉木 吉隆, 稲津 將, 楠岡 誠一郎
    RIMS 共同研究「偏微分方程式の背後にある確率過程と解の族が示す統計力学学的な現象の解析」  2013/02
  • 時系列データに対する確率微分方程式モ デルの統計的係数決定公式と軌道の予測可能性について  [Not invited]
    中野 直人, 斉木 吉隆, 稲津 將, 楠岡 誠一郎
    文科省ワークショップ「地球気象気候現象のデータ解析とモデルの精密化」  2012/12
  • Development of sampling downscaling  [Not invited]
    Kuno, R, M. Inatsu
    AGU fall meeting  2012/12
  • 隣接閉領域トラッキング法を用いた上部対流圏の渦の力学と形状  [Not invited]
    稲津 將, 天田 祥太郎
    日本気象学会2012年度秋季大会  2012/10
  • 低次元系確率微分方程式による中高緯度冬季の長周期変動の力学と予測可能性  [Not invited]
    稲津 將, 中野 直人, 向川 均
    日本気象学会2012年度秋季大会  2012/10
  • サンプリング=ダウンスケーリングの開発(Ⅱ) 再解析データへの適用  [Not invited]
    久野 龍介, 稲津 將
    日本気象学会2012年度秋季大会  2012/10
  • 低次元相空間における確率微分方程式を用いた季節予測可能性の評価  [Not invited]
    中野 直人, 稲津 將
    日本流体力学会年会2012  2012/09
  • 気象における渦と渦  [Not invited]
    稲津將
    渦の特徴づけ研究会  2012/08
  • サンプリング=ダウンスケーリングの開発-手法の概要と再解析データへの適用-  [Not invited]
    久野 龍介, 稲津 將
    日本気象学会北海道支部2012年度第1回研究発表会  2012/06
  • サンプリング=ダウンスケーリングの開発(Ⅰ)手法の概要と地域降水と共変動する大規模場の同定  [Not invited]
    久野 龍介, 稲津 將
    日本気象学会2012年度春季大会  2012/05
  • Atmospheric responses to the Gulf Stream and the Kuroshio: Similarities and differences  [Not invited]
    Minobe, S, Y. N. Sasaki, A. Kuwano-Yoshida, H. Tokinaga, T. Asai, M. Inatsu, S.-P. Xie
    JPGU  2012/05
  • A new project on development and application of comprehensive downscaling methods over Hokkaido  [Not invited]
    Inatsu, M, T. J. Yamada, T. Sato, K. Nakamura, N. Matsuoka, A. Komatsu, Y. N. Pokarel, S. Sugimoto, S. Miyazaki
    EGU  2012/04
  • 確率微分方程式を用いた気候モデルについて  [Not invited]
    中野 直人, 稲津 將, 向川 均, 楠岡 誠一郎
    RIMS共同研究「偏微分方程式の背後にある確率過程と解の族が示す統計力学学的な現象の解析」  2011/12
  • 低次元系における確率微分方程式による中高緯度冬季の長周期変動の力学と予測可能性(1)  [Not invited]
    稲津 將, 中野 直人, 向川 均
    日本気象学会北海道支部2011年度第2回研究発表会  2011/12
  • 日本付近の冬季の温帯低気圧頻度  [Not invited]
    稲津 將, 寺倉 和敬
    日本気象学会2011年度秋季大会  2011/11
  • A scale interaction study on East Asian cyclogenesis using a general circulation model coupled with an interactively nested regional model  [Not invited]
    Inatsu, M, M. Kimoto
    WCRP  2011/10
  • アリューシャン渦の形成及び伝播特性  [Not invited]
    石山 宙夢, 上野 洋路, 稲津 將
    日本海洋学会2011年度秋季大会  2011/09
  • 日本付近の冬季の温帯低気圧頻度  [Not invited]
    稲津 將, 寺倉 和敬
    気候系のhot spot:熱帯と寒帯が近接するモンスーンアジアの大気海洋結合変動」2011年度全体会議  2011/08
  • 「領域モデルを用いた気候研究」  [Not invited]
    稲津將
    北海道大学HSSセミナー  2011/06
  • 気候力学確率微分方程式の構築に向けて「地球環境流体研究と数理科学」  [Not invited]
    稲津 將, 中野 直人, 向川 均
    ワークショップ  2011/06
  • 日本付近の冬季の温帯低気圧頻度  [Not invited]
    稲津 將, 寺倉 和敬
    日本気象学会北海道支部2011年度第1回研究発表会  2011/06
  • 隣接閉領域トラッキングによる台風トラック  [Not invited]
    佐竹 祐哉, 稲津 將
    平成22年度京都大学防災研究所共同研究集会「台風研究会」  2011/01
  • 双方向ネスト実験はGCM バイアスを低減できるか?-1997年夏の例.  [Not invited]
    稲津 將, 木本 昌秀, 佐竹 祐哉
    日本気象学会2010年度秋季大会  2010/10
  • 双方向ネスト実験はGCM バイアスを低減できるか?-1997年夏の例.  [Not invited]
    稲津 將, 木本 昌秀, 佐竹 祐哉
    日本流体力学会2010年会  2010/09
  • 大気力学からの提案.  [Not invited]
    稲津將
    日本海洋学会秋季大会  2010/09
  • A scale interaction study on East Asian cyclogenesis using a general circulation model coupled with an interactively nested regional model.  [Not invited]
    Inatsu, M, M. Kimoto, Y. Satake
    NHM International Workshop  2010/08
  • 双方向ネスト実験はGCM バイアスを低減できるか?-1997年夏の例.  [Not invited]
    稲津 將, 木本 昌秀, 佐竹 祐哉
    日本気象学会北海道支部2010年度第1回研究発表会  2010/06
  • 「温暖化影響評価のためのマルチモデルアンサンブルとダウンスケーリングの研究」第1期研究の紹介.  [Not invited]
    高藪 出, 大楽 浩司, 木村 富士男, 田中 賢治, 西森 基貴, 鼎 信次郎, 稲津 將他, 参画研究者一同
    日本気象学会2010年度春季大会  2010/05
  • 冬季日本周辺で起きる爆弾低気圧の長期変化.  [Not invited]
    岩尾 航希, 稲津 將, 木本 昌秀
    日本気象学会2010年度春季大会  2010/05
  • 隣接閉領域トラッキングによる台風トラック.  [Not invited]
    佐竹 祐哉, 稲津 將, 見延 庄士郎
    日本気象学会2010年度春季大会  2010/05
  • Combing GCM and regional model: A two-way nesting approach.  [Not invited]
    Inatsu, M, M. Kimoto
    IPRC Seminar  2010/05
  • 領域大気モデル中の境界層全層における湾流に対する大気応答のメカニズム.  [Not invited]
    高玉 孝平, 見延 庄士郎, 稲津 將
    日本海洋学会春季大会  2010/03
  • 東シナ海の黒潮による梅雨への影響Ⅱ:非静力学モデル実験.  [Not invited]
    浅井 丈昭, 見延 庄士郎, 稲津 將
    日本海洋学会春季大会  2010/03
  • Contributions of different mechanisms for atmospheric response to the Gulf Stream in a regional atmospheric model.  [Not invited]
    Takatama, K, S. Minobe, M. Inatsu
    Ocean Science Meeting  2010/02
  • Influence of the Kuroshio in the East China Sea on the troposphere and relating disastrous heavy rainfall event.  [Not invited]
    Asai, T, S. Minobe, M. Inatsu
    Ocean Science Meeting  2010/02
  • The neighbor enclosed area tracking algorithm and its application to cyclone merger above the Kuroshio.  [Not invited]
    Inatsu Masaru
    Ocean Science Meeting  2010/02
  • Combing GCM and regional model: A two-way nesting approach.  [Not invited]
    Inatsu, M, M. Kimoto
    Workshop on the dynamical downscaling.  2010/01
  • 隣接閉領域トラッキングによる台風トラック.  [Not invited]
    佐竹 祐哉, 稲津 將, 見延 庄士郎
    日本気象学会北海道支部2009年度第2回研究発表会  2009/12
  • 東シナ海の黒潮による梅雨への影響:降水集中化の可能性.  [Not invited]
    浅井 丈昭, 見延 庄士郎, 稲津 將
    日本気象学会北海道支部2009年度第2回研究発表会  2009/12
  • 隣接閉領域トラッキングを用いた対流圏上層における渦挙動の気候学的解析.  [Not invited]
    天田 祥太郎, 稲津 將
    日本気象学会北海道支部2009年度第2回研究発表会  2009/12
  • 隣接閉領域トラッキング.  [Not invited]
    稲津將
    日本気象学会秋季大会  2009/11
  • 隣接閉領域トラッキング.  [Not invited]
    稲津將
    平成21年度京都大学防災研究所特定共同研究集会「異常気象と長期変動」  2009/10
  • 東シナ海の黒潮による梅雨への影響:降水集中化の可能性  [Not invited]
    見延 庄士郎, 浅井 丈昭, 稲津 將
    日本海洋学会秋季大会  2009/10
  • 隣接閉領域トラッキング.  [Not invited]
    稲津將
    日本気象学会北海道支部2009年度第1回研究発表会  2009/06
  • 北半球冬季の北東アジアにおけるスケール間相互作用研究(2)亜総観規模山岳の効果  [Not invited]
    稲津 將, 木本 昌秀
    日本気象学会春季大会  2009/05
  • Influence of the Kuroshio in the East China Sea on the atmosphere.  [Invited]
    Minobe, S, T. Asai, M. Miyashita, K. Takatama, M. Inatsu
    The 15th Pacific-Asian Marginal Seas Meeting  2009/04
  • A scale interaction study on East Asian cyclogenesis using a general circulation model with an interactively nested regional model.  [Not invited]
    Inatsu, M, M. Kimoto
    AGU fall meeting  2008/12
  • 北半球冬季の北東アジアにおけるスケール間相互作用研究 (1) 亜総観規模擾乱の効果  [Not invited]
    稲津 將, 木本 昌秀
    日本気象学会秋季大会  2008/11
  • 域大気モデル中の湾流に対する大気応答のメカニズム  [Not invited]
    高玉 孝平, 見延 庄士郎, 稲津 將
    平成20年度京都大学防災研究所特定共同研究集会「気候変動と異常気象─メカニズムと予測可能性」  2008/10
  • ジェット=ストリームの謎を気候モデルで解く  [Invited]
    稲津將
    日本気象学会北海道支部会夏期大学  2008/07
  • インタラクティブネスティングシステム(INCL)を用いた小規模温帯低気圧が気候に及ぼす影響(1)小規模渦の効果.  [Not invited]
    稲津 將, 木本 昌秀
    日本気象学会北海道支部2008年度第1回研究発表会  2008/06
  • 南半球インド洋から伝播する定常波変動に関する解析  [Not invited]
    稲津 將
    日本気象学会春季大会  2008/05
  • Stratospheric sudden warming with projected global warming and related tropospheric wave activity  [Invited]
    Inatsu, M, M. Kimoto, A. Sumi
    JSPS-DFG Round Table on Climate System Research - Status and Perspective  2008/01
  • Climate Change Impact on Agriculture in North China Plain by Using EPIC Model and MIROC Data  [Not invited]
    楊 鵬, 稲津 將, 木本 昌秀, 陳 鮮艶
    日本農業気象学会予稿集  2007/03
  • プロジェクト1年の取り組み~双方向ネスティングシステムの開発と中国華北の冬小麦生産高の気候変動に対する応答  [Not invited]
    稲津 將, 楊 鵬, 木本 昌秀
    領域創成プロジェクト並びに気候環境アプリケーション創成コンソーシアム第1回研究会  2007/02
  • 温暖化気候における成層圏突然昇温  [Not invited]
    稲津 將, 木本 昌秀, 住 明正
    日本気象学会2006年秋季大会  2006/10
  • The stratospheric sudden warming and its global warming response in an atmosphere-ocean coupled GCM.  [Not invited]
    Inatsu, M, M. Kimoto, A. Sumi
    2nd Korea-Japan-China Joint Conference on Meteorology  2006/10
  • High-resolution coupled ocean-atmosphere modeling for climate studies.  [Not invited]
    Workshop on polar, global climate modeling, connection a, interplay
    Kimoto, M., A. Sumi, and M. Inatsu  2006/06
  • An aspect of stratospheric and tropospheric global warming response in an atmosphere-ocean coupled GCM.  [Not invited]
    Inatsu, M, M. Kimoto, A. Sumi
    Workshop on polar and global climate modeling: connection and interplay  2006/06
  • The atmosphere--ocean coupled effect in the high-resolution CCSR/NIES/FRCGC GCM.  [Not invited]
    Inatsu, M, M. Kimoto
    EGU  2006/04
  • 気候データの応用利用促進に向けて  [Not invited]
    稲津 將, 楊 鵬
    領域創成プロジェクト並びに気候環境アプリケーション創成コンソーシアム発足記念ワークショップ  2005/12
  • 南半球冬季のストームトラックの東西非一様性 --2005年度山本・正野論文賞受賞記念講演--  [Not invited]
    稲津將
    日本気象学会2005年秋季大会  2005/11
  • 高解像度CCSR/NIES/FRCGC GCMにおける大気海洋結合効果  [Not invited]
    稲津 將, 木本 昌秀
    平成17年度京都大学防災研究所特定共同研究集会「気候変動のメカニズムと予測可能性」  2005/10
  • The zonal asymmetry of the Southern Hemisphere winter storm-track.  [Not invited]
    Inatsu, M, B. J. Hoskins
    IAMAS  2005/08
  • The atmosphere--ocean coupled effect in the high-resolution CCSR/NIES/FRCGC GCM.  [Not invited]
    Inatsu, M, M. Kimoto
    IAMAS  2005/08
  • 高解像度CCSR/NIES/FRCGC GCMにおける大気海洋結合効果  [Not invited]
    稲津 將, 木本 昌秀
    日本気象学会2005年春季大会  2005/05
  • The mid-latitude storm track response to terrestrial and radiative forcings.  [Not invited]
    Inatsu, M, Brian J. Hoskins, H. Mukougawa, S.-P. Xie, M. Kimoto
    IPRC Seminar  2005/02
  • The atmosphere--ocean coupled effect in the high-resolution CCSR/NIES/FRCGC GCM.  [Not invited]
    Inatsu, M, M. Kimoto
    2005/02
  • 温暖化時のストームトラック  [Not invited]
    稲津 將, 木本 昌秀
    平成16年度京都大学防災研究所特定共同研究集会「異常気象と長期変動」  2004/10
  • 温暖化時のストームトラックの真冬の振幅極小  [Not invited]
    稲津 將, 木本 昌秀
    日本気象学会2004年秋季大会  2004/10
  • The mid-latitude storm track response to terrestrial and radiative forcings.  [Not invited]
    Inatsu, M, M. Kimoto, H. Mukougawa, S.-P. Xie, B. J. Hoskins
    The University Allied Workshop on Climate and Environmental Studies for Global Sustainability  2004/07
  • 南半球ストームトラックの東西非対称性の形成.  [Not invited]
    稲津 將, Brian J Hoskins
    日本気象学会2004年春季大会  2004/05
  • 南半球ストームトラックの東西非対称性の季節および経年変動.  [Not invited]
    稲津 將, Brian J Hoskins
    日本気象学会2004年春季大会  2004/05
  • Atmospheric response to zonal variations in mid-latitude SST: Transient and stationary eddies and their feedback.  [Not invited]
    Inatsu, M, H. Mukougawa, S.-P. Xie
    IUGG 2003  2003/07
  • Atmospheric response to zonal variations in mid-latitude SST: Transient and stationary eddies and their feedback.  [Not invited]
    Inatsu, M, H. Mukougawa, S.-P. Xie
    International Symposium on Stratospheric Variations and Climate  2002/10
  • 中緯度SST強制に対する定常波とストームトラック形成機構.  [Not invited]
    稲津 將, 向川 均, 謝 尚平
    日本気象学会2002年秋季大会  2002/10
  • 北太平洋域でのブロッキング形成に対する大規模山岳の役割.  [Not invited]
    向川 均, 中澤 留威, 荒井 美紀, 稲津 將
    日本気象学会2002年度秋季大会  2002/10
  • 中緯度海面水温に対するストームトラックの応答.  [Not invited]
    稲津 將, 向川 均, 謝 尚平
    特定領域研究 (B) 「成層圏力学過程とオゾンの変動およびその気候への影響」 平成13年度公開シンポジウム  2002/02
  • Formation of zonal asymmetry in wintertime circulations in an idealized AGCM: Westerly jet core, stationary eddy, and storm track.  [Not invited]
    Mukougawa, H, M. Inatsu, S.-P. Xie
    IAMAS 2001  2001/07
  • Zonally localized storm tracks in an idealized AGCM.  [Not invited]
    Inatsu, M, H. Mukougawa, S.-P. Xie
    13th Conference on Atmospheric and Oceanic Fluid Dynamics  2001/06
  • Zonal variation in westerly jet wind and storm tracks in an idealized AGCM.  [Not invited]
    Inatsu, M, H. Mukougawa, S.-P. Xie
    IPRC Seminar,  2001/06
  • 北極振動の東西非一様性を同定する境界条件  [Not invited]
    稲津 將, 向川 均, 謝 尚平
    日本気象学会2001年春季大会  2001/05
  • GCM experiments on the impact of surface boundary conditions on the Arctic Oscillation.  [Not invited]
    Inatsu, M, H. Mukougawa, S.-P. Xie
    U.S.-Japan Seminar  2001/03
  • Formation of zonal asymmetry in wintertime circulations in an idealized AGCM: Westerly jet core, stationary eddy, and storm track.  [Not invited]
    Mukougawa, H, M. Inatsu, S.-P. Xie
    2001/03
  • On the localization of strong wind shear and storm tracks in an idealized AGCM  [Not invited]
    Inatsu, M, H. Mukougawa, S.-P. Xie
    International Workshop on Global Change  2001/01
  • 理想化したAGCMにおけるストームトラックの局在化  [Not invited]
    稲津 將, 向川 均, 謝 尚平
    日本気象学会 2000年秋季大会  2000/10
  • 熱源分布による亜熱帯ジェットの形成  [Not invited]
    稲津 將, 向川 均, 謝 尚平
    第12回日本気象学会夏季特別セミナー  2000/07
  • 山岳のないAGCMにおける対流圏の中高緯度の定在波動  [Not invited]
    稲津 將, 向川 均, 謝 尚平
    日本気象学会1999年秋季大会  1999/11
  • 山岳のないAGCM における東西非一様な時間平均場の形成  [Not invited]
    稲津 將, 向川 均, 謝 尚平
    日本気象学会1999年春季大会  1999/04
  • 山岳のないAGCM における東西非一様な時間平均場の形成  [Not invited]
    稲津 將, 向川 均, 謝 尚平
    地球流体セミナー  1999/03
  • 偏西風とストームトラックの関係について  [Not invited]
    稲津 將, 向川 均, 謝 尚平
    日本気象学会北海道支部1998年度第2回研究発表会  1998/11

MISC

Awards & Honors

  • 2016/02 北海道大学 教育総長賞奨励賞
     
    受賞者: 稲津將
  • 2014/09 日本海洋学会 若手ベストポスター賞
     
    受賞者: 石山 宙夢;上野 洋路;稲津 將;伊藤 幸彦
  • 2013/01 気象集誌論文賞
     
    受賞者: 稲津 將;佐竹 祐哉;木本 昌秀;安富 奈津子
  • 2005/11 日本気象学会 山本・正野論文賞
     
    受賞者: 稲津將

Research Grants & Projects

  • 大気ブロッキング発生の力学と予測可能性
    文部科学省:科学研究費 基盤研究(C)
    Date (from‐to) : 2018 -2020 
    Author : 稲津將
  • 気候変動適応技術社会実装プログラム
    文部科学省:受託研究費(SICAT)
    Date (from‐to) : 2015 -2019 
    Author : 稲津將
  • 気象学の低次元空間解析と予測
    文部科学省:科学研究費 基盤研究(B)
    Date (from‐to) : 2014 -2016 
    Author : 稲津將
     
    研究計画の通り、(1)気象の長周期変動とその予測の数学的解明と(2)温帯低気圧の形状変化の数学的解明を並列的に実施した。(1)気象の長周期変動と予測:平成27年度において、5,000年の気候シミュレーション標準実験データに基づき4次元以上の確率微分方程式を構築し、予測可能性の議論を行った。その結果、初期摂動育成法による初期誤差成長と長期積分結果の位相空間解析におけるmultiple realisationを比較することが有用であるとの結論を得た。まず、予測可能性研究における初期摂動育成法と確率微分方程式法の比較のために、標準実験データに基づき5次元の確率微分方程式を構築した。平成27年度と同様に対流圏における北半球冬季における長周期変動の主成分を5つ取り出し、これによって張られた相空間において予測可能性を議論した。とくに、5次元確率微分方程式と相空間内におけるデータの軌道束の多様体との関係を考察した。また、初期摂動育成法に基づく初期誤差成長を考察するため、初期摂動育成法を大気大循環モデルに実装した。2)温帯低気圧の形状変化:温帯低気圧にみられる典型的な形状の時間発展を、研究分担者・荒井との数学的議論にもとづき、類型化した。とくに、パーシステント・ホモロジーを利用した低気圧の形状の分類を試みた。その結果、形状分類だけでなく低気圧の追跡にもパーシステントホモロジーが有用であることがわかった。そこで、トラッキングプログラムを新たに構築し、10年分の気象解析データに基づいた北太平洋における低気圧経路を計算した。また、そのための位相幾何学と気象学に関する共同成果発表会を開催した。
  • 新トラッキング法による革新的な低気圧診断
    文部科学省:科学研究費若手研究(B)
    Date (from‐to) : 2013 -2015 
    Author : 稲津將
     
    新トラッキング法を用いて個々の低気圧特性の詳細な定量化に関し、以下の3点を実現した。(A)対流圏界面付近の渦の幾何形状と渦の力学の関係を明らかにした。とくに、これまで誰も直接示していない渦の楕円形状と渦の西風運動量輸送の整合性に着目した。(B)熱帯低気圧へ新トラッキング手法を適用した。とくに、気象格子点データより、個々の台風の特性を明らかにしながら、客観的に追跡する方法を確立した。(C)日本付近を通過する温帯低気圧カタログを作成した。とくに、過去の気象統計と並び立って気象情報の現業利用に資するよう、主観的な天気図と整合性の高いものを公開した。
  • 北海道を対象とする総合的ダウンスケール手法の開発
    文部科学省:受託研究費(RECCA)
    Date (from‐to) : 2010 -2014 
    Author : 稲津將
  • 文部科学省:科学研究費補助金(若手研究(B))
    Date (from‐to) : 2009 -2011 
    Author : 稲津將
     
    本研究の目的は、数百kmのスケールで盛んにおこっているであろうと考えられている中緯度大気海洋相互作用を理解するために、全球シミュレーションモデルに領域シミュレーションモデルを結合した計算を実施することにある。本年度はモデルの改良と領域シミュレーション実験を行う予定であった。モデルの改良は順調に進み、大気全球モデルと大気領域モデルの結合でアンサンブルシミュレーションを行う手はずが整った。一方、領域シミュレーション実験の結果に基づいて低気圧の発達率を計算する予定であったが、既存のトラッキングプログラムでは併合するタイプの低気圧をトラックすることができないことが分かった。そこで急遽、別財源を用いてトラッキングプログラムを整備した。そのプログラムは併合・分裂を含むいかなる挙動を示す低気圧のトラックに対しても十分な性能を持っているほか、低気圧に伴う物質交換量を3次元的に把握することもできる。一見、本年度の研究予定事項を終えていないようにも見えるが、このプログラム整備が終了したことで目下の障害は除かれ、来年度以降、予定のスケジュール通り、シミュレーション結果の解析を行っていく予定である。
  • 大気海洋結合モデルと領域気候モデルの双方向ネスティングの実現
    文部科学省:科学研究費若手研究(B)
    Date (from‐to) : 2006 -2008 
    Author : 稲津將
     
    大気海洋結合モデルMIROC(東京大学、国立環境研究所、海洋開発研究機構の共同開発)と領域モデルJMA/MRI NHM(気象庁の開発)とを双方向にネストするモデルを開発した。 そのモデルを使って、北東アジアの大気マルチスケール相互作用研究に適応し、通常の全球モデルでは解像できない小規模渦と小規模山岳の効果を見積もった。 その結果より、小規模渦の効果は領域内部に留まるものの、小規模山岳の効果は全球に及ぶ可能性が示唆された。


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