Updated on 2026/07/24

写真a

 
UTSUMI NOBUYUKI
 
Organization
School of Environment and Society Associate Professor
Title
Associate Professor
External link

News & Topics

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Hydroengineering

Papers

  • ANALYSIS OF GLOBAL LONG-TERM CHANGES IN PRECIPITATION WHIPLASH USING CESM2-LENS Reviewed

    Keisuke FUJISAWA, Nobuyuki UTSUMI

    Japanese Journal of JSCE   82 ( 16 )   n/a - n/a   2026.2

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    Authorship：Last author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejj.25-16021

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  • An Incremental Learning Framework Linking Reanalysis and Radar Data for Passive Microwave Precipitation Retrievals

    Buddha Subedi, Mahyar Garshasbi, Ardeshir Ebtehaj, Lisa Milani, Nobuyuki Utsumi, George J. Huffman

    IEEE Transactions on Geoscience and Remote Sensing   2026

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1109/TGRS.2026.3713037

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  • Divergent trends of Tmax-based and Tw-based heat extremes across Asia's climatic divide Reviewed International coauthorship International journal

    Jina Park, S.-Y. Simon Wang, Hyungjun Kim, Jee-Hoon Jeong, Nobuyuki Utsumi, Suyeon Moon, Jin-Ho Yoon

    Climatic Change   2025.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    <jats:title>Abstract</jats:title>
    <jats:p>This study investigates the contrasting trends in extreme Tmax events and extreme wet-bulb temperature (Tw) events across the monsoon and arid regions of Asia using the ERA5 reanalysis dataset. Our analysis reveals a substantial shift in the monsoon region, where extreme Tw events have risen by 1.95 days, outpacing the increase in extreme Tmax events. In the arid region, extreme Tmax events have increased more significantly, exceeding extreme Tw by an average of 2.05 days in recent years, reflecting the limited moisture availability in this area. Spatiotemporal analyses also reveal the widespread prevalence of humid-heat extremes in monsoon Asia and the intensification of primarily dry heat extremes in arid regions. These divergent trajectories highlight the pivotal role of climatological differences, with the change in monsoonal circulations amplifying humid extremes, while the inherent aridity constrains humidity increases. Our findings emphasize the need for regional adaptation strategies and mitigation efforts to address the escalating impacts on human society and ecosystems across Asia's climatic divide.</jats:p>

    DOI： 10.1007/s10584-025-04035-x

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  • Aerosol-induced surface cooling elevates relative humidity on the Indo-Gangetic Plain

    Jina Park, S. -Y. Simon Wang, Hyungjun Kim, Jee-Hoon Jeong, Nobuyuki Utsumi, Suyeon Moon, Jin-Ho Yoon

    Communications Earth &amp; Environment   2025.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    <jats:title>Abstract</jats:title>
    <jats:p>The Indo-Gangetic Plain has experienced a substantial rise in relative humidity in recent decades, with implications for human health and well-being. Here we use atmospheric reanalysis and large-ensemble climate model simulations to assess changes since the 1960s. Relative humidity increased by 10.3 ± 0.3 percent, mainly due to a 2.9 ± 0.1 grams per kilogram rise in specific humidity and a slight decrease in air temperature (−0.2 ± 0.1 degrees Celsius). Aerosol-induced surface cooling played a crucial role in enabling this moistening. Decomposition analysis reveals that specific humidity accounts for 95% of the increase, with cooling explaining the rest. Future projections show contrasting trends. High-emission scenarios peak and then decline after the 2040s, as greenhouse gas warming overtakes weakening aerosol effects. In contrast, low-emission scenarios maintain stable or slightly increasing humidity. These findings reveal how aerosols and greenhouse gases exert opposing influences on humidity and underscore the need for coordinated climate strategies in this vulnerable region.</jats:p>

    DOI： 10.1038/s43247-025-02513-9

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  • Discrimination of Light Precipitation from COWVR + TEMPEST, GMI, and ATMS Passive Microwave Radiometer Observations Reviewed International coauthorship International journal

    F. Joseph Turk, Chris Kidd, Nobuyuki Utsumi, Kazumasa Aonashi

    Journal of Atmospheric and Oceanic Technology   2025.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    <jats:title>Abstract</jats:title>
    <jats:p>In the near future, the number of low-cost, SmallSat/CubeSat-sized passive microwave (MW) radiometric observations available from low-Earth-orbiting (LEO) satellites is expected to increase substantially, especially high-frequency (HF) sounders (near or exceeding 90 GHz). The number of sensors that include the constant-incidence angle, dual-polarization low-frequency (LF) channels (near or below 37 GHz) will remain steady or decline. Maintaining LF sensing capabilities in the global satellite constellation for precipitation is one of the key recommendations of the International Precipitation Working Group (IPWG). Physically, the use of HF-only sensors for precipitation skews the precipitation estimates toward indirect, ice-based (scattering) retrievals rather than the precipitation closer to the surface. Over certain Earth surfaces, a portion of light precipitation (2 mm h<jats:sup>−1</jats:sup> or less) may remain undetected, which has ramifications for global satellite-based precipitation products. Observations from the SmallSat-sized Compact Ocean Wind Vector Radiometer (COWVR) and the Temporal Experiment for Storms and Tropical Systems (TEMPEST) duo are compared with the Global Precipitation Measurement (GPM) Microwave Imager (GMI) and the Advanced Technology Microwave Sounder (ATMS) for discriminating light precipitation over a variety of Earth surface conditions. Precipitation is discriminated using a surface emissivity–based transformation applied to selected channel combinations from each of these sensors using the GPM dual-frequency precipitation radar (DPR) products as precipitation references. The results presented in this study highlight the importance of the LF channels for detection of light precipitation over ocean and lightly vegetated surfaces and 50-GHz temperature sounding channels over heavily vegetated surfaces.</jats:p>
    <jats:sec>
    <jats:title>Significance Statement</jats:title>
    <jats:p>In the future, the number of low-cost, SmallSat or CubeSat-sized passive microwave sensors in low-Earth orbit is expected to increase substantially, especially high-frequency sounders operating near or above 90 GHz. Over certain Earth surfaces, the exclusion of low-frequency channels below 37 GHz implies that a portion of light precipitation (less than 2 mm h<jats:sup>−1</jats:sup>) may remain undetected, which has ramifications for global satellite-based precipitation products. This study emphasizes the need to maintain low-frequency sensing capabilities in the global satellite constellation to represent the range of precipitation intensity. Selected combinations of low- and high-frequency channels from sensors onboard a SmallSat highlight the benefit of low-frequency channels to improve the detection of light precipitation over ocean and vegetated surfaces.</jats:p></jats:sec>

    DOI： 10.1175/jtech-d-24-0061.1

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  • Psychological evaluation of a virtual connected room from the perspective of we-mode

    Yuki Harada, Yoshihiro Sato, Ayumi Kambara, Kazuo Oki, Ryo Takahashi, Nobuyuki Utsumi, Ryuhei Tsuji, Yoshimichi Sato

    Frontiers in Virtual Reality   2025.5

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    Publishing type：Research paper (scientific journal)  

    <jats:p>A potential factor for video-meetings that negatively influences users’ psychological aspects is the reduction of the we-mode. The we-mode refers to a cognitive state in which team members share mental states, allowing them to coordinate actions based on each other’s conditions and enhance joint performance. To address this reduction, we developed a prototype video-meeting system (virtual connected room) designed to enhance the presence of users as if they were in the same room. This study evaluated the effectiveness of a virtual connected room from the perspective of the we-mode. In the experiment, a pair of participants performed three tasks in face-to-face, virtual connected, and display-based remote conditions. We used the referential communication task to evaluate the efficiency of communications and the joint Simon and number judgement tasks to evaluate the we-mode. The results showed that the virtual connected condition influenced the responses of joint Simon and number judgment, but did not influence the performance of the referential communication task. These results suggest that the virtual connected room promotes the we-mode.</jats:p>

    DOI： 10.3389/frvir.2025.1563866

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  • Advancing Global Precipitation Data Products: Recommendations from the International Precipitation Working Group

    T. Kubota, C. Kummerow, G. Panegrossi, S. Ringerud, N. Utsumi, F. Joseph Turk

    Bulletin of the American Meteorological Society   2025.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1175/bams-d-25-0011.1

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  • 3LATNet: Attention based deep learning model for global Chlorophyll-a retrieval from GCOM-C satellite

    Muhammad Salah, Salem Ibrahim Salem, Nobuyuki Utsumi, Hiroto Higa, Joji Ishizaka, Kazuo Oki

    ISPRS Journal of Photogrammetry and Remote Sensing   220   490 - 508   2025.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.isprsjprs.2024.12.019

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  • CORRECTION OF XRAIN PRECIPITATION INTENSITY USING 1-MINUTE RAIN GAUGE DATA

    Shinta SETO, Nobuyuki UTSUMI, Takuji KUBOTA

    Japanese Journal of JSCE   81 ( 16 )   n/a - n/a   2025

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    Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejj.24-16160

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  • RNN-Based Approach for Broccoli Harvest Time Forecast

    Mykhailo Lohachov, Ryoji Korei, Kazuo Oki, Koshi Yoshida, Issaku Azechi, Salem Ibrahim Salem, Nobuyuki Utsumi

    Agronomy   2024.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    <jats:p>This article investigates approaches for broccoli harvest time prediction through the application of various machine learning models. This study’s experiment is conducted on a commercial farm in Ecuador, and it integrates in situ weather and broccoli growing cycle observations made over seven years. This research incorporates models such as the persistence, thermal, and calendar models, demonstrating their strengths and limitations in calculating the optimal broccoli harvest day. Additionally, Recurrent Neural Network (RNN) models with Long Short-term Memory (LSTM) layers were developed, showcasing enhanced accuracy with an error of less than 2.5 days on average when combined with outputs from the calendar model. In the final comparison, the RNN models outperformed both the thermal and calendar models, with an error of 3.14 and 2.5 days, respectively. Furthermore, this article explores the impact of utilizing Global Ensemble Forecast System forecast weather data as a supplementary source to the in situ observations on model accuracy. The analysis revealed the limited effect of extension with a 9-day forecast on the experimental field, reaching an error reduction of up to 0.04 days. The findings provide insights into the effectiveness of different modeling approaches for optimizing broccoli harvest times, emphasizing the potential of RNN techniques in agricultural decision making.</jats:p>

    DOI： 10.3390/agronomy14020361

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  • IMPROVEMENT OF THE METHOD TO DERIVE RAIN RATES FROM RAIN GAUGE OBSERVATIONS: A VALIDATION STUDY USING A DISDROMETER

    Shinta SETO, Nobuyuki UTSUMI, Takuji KUBOTA

    Japanese Journal of JSCE   2024

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.2208/jscejj.23-16040

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  • Anthropogenic warming induced intensification of summer monsoon frontal precipitation over East Asia

    Suyeon Moon, Nobuyuki Utsumi, Jee-Hoon Jeong, Jin-Ho Yoon, S.-Y. Simon Wang, Hideo Shiogama, Hyungjun Kim

    Science Advances   2023.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    <jats:p>Summer monsoon frontal rainfall in East Asia (EA) is crucial for water resources and flood hazards in densely populated areas. Recent studies have documented the increasing intensity of summer frontal rainfall over recent decades. However, the extent of ongoing climate change on the intensification of the EA frontal precipitation system remains uncertain. Using an objective method for detecting frontal systems, we found a 17 ± 3% increase in observed frontal rainfall intensity during 1958 to 2015. Climate model simulations with and without greenhouse gases suggest that anthropogenic warming plays a key role in the intensification of EA summer frontal precipitation by 5.8% from 1991 to 2015. The analysis highlights that enhanced water vapor convergence and reinforced western North Pacific subtropical High collectively increased moisture transport to the region, resulting in intensified EA frontal precipitation. The results lend support to the anthropogenic warming–induced enhancement of the EA frontal precipitation and its persistence in the future.</jats:p>

    DOI： 10.1126/sciadv.adh4195

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  • Anthropogenic Fingerprint on Recent Changes in Typhoon Heavy Rainfall beyond Tipping-Point

    Hyungjun Kim, Nobuyuki Utsumi

    2023.5

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  • Multi‐Task Learning for Simultaneous Retrievals of Passive Microwave Precipitation Estimates and Rain/No‐Rain Classification

    Takumi Bannai, Haoyang Xu, Nobuyuki Utsumi, Eunho Koo, Keming Lu, Hyungjun Kim

    Geophysical Research Letters   2023.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    <jats:title>Abstract</jats:title><jats:p>Satellite‐based precipitation estimations provide frequent, large‐scale measurements. Deep learning has recently shown significant potential for improving estimation accuracy. Most studies have employed a two‐stage framework, which is a sequential architecture of a rain/no‐rain binary classification task followed by a rain rate regression task. This study proposes a novel precipitation retrieval framework in which these two tasks are simultaneously trained using multi‐task learning approach (MTL). Furthermore, a novel network architecture and loss function were designed to reap the benefits of MTL. The proposed two‐task model successfully achieved a better performance than the conventional single‐task model possibly due to efficient knowledge transfer between tasks. Furthermore, the product intercomparison showed that our product outperformed existing products in rain rate retrieval and also yielded better skills in the rain/no‐rain retrieval task.</jats:p>

    DOI： 10.1029/2022gl102283

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  • Examination of aerosol impacts on convective clouds and precipitation in two metropolitan areas in East Asia; how varying depths of convective clouds between the areas diversify those aerosol effects? International coauthorship International journal

    Seoung Soo Lee, Jinho Choi, Goun Kim, Kyung-Ja Ha, Kyong-Hwan Seo, Chang Hoon Jung, Junshik Um, Youtong Zheng, Jianping Guo, Sang-Keun Song, Yun Gon Lee, Nobuyuki Utsumi

    Atmospheric Chemistry and Physics   2022.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    <jats:p>Abstract. This study examines the role played by aerosols which act as cloud
    condensation nuclei (CCN) in the development of clouds and precipitation in
    two metropolitan areas in East Asia that have experienced substantial
    increases in aerosol concentrations over the last decades. These two areas
    are the Seoul and Beijing areas and the examination was done by
    performing simulations using the Advanced Research Weather Research and
    Forecasting model as a cloud system resolving model. The CCN are advected from the continent to the Seoul area and this increases aerosol concentrations in the Seoul area. These increased CCN concentrations induce the enhancement of condensation that in turn induces the enhancement of deposition and precipitation amount in a system of less deep convective clouds as compared to those in the Beijing area. In a system of deeper clouds in the Beijing area, increasing CCN concentrations also enhance condensation but reduce deposition. This leads to negligible CCN-induced changes in the precipitation amount. Also, in the system there is a competition for convective energy among clouds with different condensation and updrafts. This competition results in different responses to increasing CCN concentrations among different types of precipitation, which are light, medium and heavy precipitation in the Beijing area. The CCN-induced changes in freezing play a negligible role in CCN-precipitation interactions as compared to the role played by CCN-induced changes in condensation and deposition in both areas.
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    DOI： 10.5194/acp-22-9059-2022

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  • Observed influence of anthropogenic climate change on tropical cyclone heavy rainfall

    Nobuyuki Utsumi, Hyungjun Kim

    Nature Climate Change   2022.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s41558-022-01344-2

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  • 将来変化倍率の逆転に着目したd4PDF領域実験における2℃と4℃上昇の極端降水量の考察 Reviewed

    渡部 哲史, 内海 信幸, 北野 利一, 中北 英一

    土木学会論文集Ｂ１（水工学）   77 ( 2 )   I_1279 - I_1284   2021.9

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：公益社団法人 土木学会  

    DOI： 10.2208/jscejhe.77.2_i_1279

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  • Adapting Passive Microwave-Based Precipitation Algorithms to Variable Microwave Land Surface Emissivity to Improve Precipitation Estimation from the GPM Constellation

    F. Joseph Turk, Sarah E. Ringerud, Yalei You, Andrea Camplani, Daniele Casella, Giulia Panegrossi, Paolo Sano, Ardeshir Ebtehaj, Clement Guilloteau, Nobuyuki Utsumi, Catherine Prigent, Christa Peters-Lidard

    JOURNAL OF HYDROMETEOROLOGY   22 ( 7 )   1755 - 1781   2021.7

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  • Landsat衛星データによる河道内藪化・樹林化の検出可能性 Reviewed

    影山 壮太郎, 渡部 哲史, 知花 武佳, 内海 信幸

    河川技術論文集   27 ( 0 )   45 - 50   2021.4

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：公益社団法人 土木学会  

    DOI： 10.11532/river.27.0_45

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  • Mid-latitude mixed-phase stratocumulus clouds and their interactions with aerosols: how ice processes affect microphysical, dynamic and thermodynamic development in those clouds and interactions?

    Seoung Soo Lee, Kyung-Ja Ha, Manguttathil Gopalakrishnan Manoj, Mohammad Kamruzzaman, Hyungjun Kim, Nobuyuki Utsumi, Jianping Guo

    Atmospheric Chemistry and Physics   2021.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    <jats:p>Abstract. Midlatitude mixed-phase stratocumulus clouds and their interactions with
    aerosols remain poorly understood. This study examines the roles of ice
    processes in those clouds and their interactions with aerosols using a
    large-eddy simulation (LES) framework. Cloud mass becomes much lower in the
    presence of ice processes and the Wegener–Bergeron–Findeisen (WBF) mechanism
    in the mixed-phase clouds compared to that in warm clouds. This is
    because while the WBF mechanism enhances the evaporation of droplets, the
    low concentration of aerosols acting as ice-nucleating particles (INPs) and
    cloud ice number concentration (CINC) prevent the efficient deposition of
    water vapor. Note that the INP concentration in this study is based on the
    observed spatiotemporal variability of aerosols. This results in the lower
    CINC compared to that with empirical dependence of the INP concentrations
    on temperature in a previous study. In the mixed-phase clouds, the
    increasing concentration of aerosols that act as cloud condensation nuclei
    (CCN) decreases cloud mass by increasing the evaporation of droplets through
    the WBF mechanism and decreasing the intensity of updrafts. In contrast to
    this, in the warm clouds, the absence of the WBF mechanism makes the
    increase in the evaporation of droplets inefficient, eventually enabling
    cloud mass to increase with the increasing concentration of aerosols acting
    as CCN. Here, the results show that when there is an increasing
    concentration of aerosols that act as INPs, the deposition of water vapor is
    more efficient than when there is the increasing concentration of aerosols
    acting as CCN, which in turn enables cloud mass to increase in the
    mixed-phase clouds.
    </jats:p>

    DOI： 10.5194/acp-2020-1318

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  • Vertical precipitation profiles estimated by satellite-based passive microwave retrievals

    Nobuyuki Utsumi, F. Joseph Turk, Ziad. S. Haddad, Pierre-Emmanuel Kirstetter, Hyungjun Kim

    2021.3

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  • Evaluation of Precipitation Vertical Profiles Estimated by GPM-Era Satellite-Based Passive Microwave Retrievals

    Nobuyuki Utsumi, F. Joseph Turk, Ziad S. Haddad, Pierre-Emmanuel Kirstetter, Hyungjun Kim

    JOURNAL OF HYDROMETEOROLOGY   22 ( 1 )   95 - 112   2021.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1175/JHM-D-20-0160.1

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  • Intrinsic uncertainty in the sub-daily satellite products at their native resolutions

    Ziad S. Haddad, Francis J. Turk, Nobuyuki Utsumi, Pierre-Emmanuel Kirstetter

    2021

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    Language：English   Publisher：World Climate Research Programme  

    DOI： 10.13021/GEWEX.PRECIP.1.1

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  • Improving Satellite-Based Subhourly Surface Rain Estimates Using Vertical Rain Profile Information Reviewed

    Nobuyuki Utsumi

    Journal of Hydrometeorology   20 ( 5 )   1015 - 1026   2019.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1175/jhm-d-18-0225.1

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  • Improving satellite-based subhourly surface rain estimates using vertical rain profile information Reviewed

    Utsumi, N., Kim, H., Turk, F.J., Haddad, Z.S.

    Journal of Hydrometeorology   20 ( 5 )   1015 - 1026   2019

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1175/JHM-D-18-0225.1

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  • Event-to-event intensification of the hydrologic cycle from 1.5 °C to a 2 °C warmer world Reviewed

    Madakumbura, G.D., Kim, H., Utsumi, N., Shiogama, H., Fischer, E.M., Seland, Ø., Scinocca, J.F., Mitchell, D.M., Hirabayashi, Y., Oki, T.

    Scientific Reports   9 ( 1 )   2019

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s41598-019-39936-2

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  • Warm Season Satellite Precipitation Biases for Different Cloud Types over Western North Pacific Reviewed

    Utsumi, N., Kim, H.

    IEEE Geoscience and Remote Sensing Letters   15 ( 6 )   808 - 812   2018

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1109/LGRS.2018.2815590

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  • Classifying large ensemble database of future climate projection : A case of precipitation in Japan Reviewed

    渡部 哲史, 内海 信幸

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE   62   Ⅰ_169 - 174   2018

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    Language：Japanese   Publisher：土木学会  

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  • The development of bias corrected hourly precipitation dataset for AMeDAS stations based on the projections from d4PDF Reviewed

    渡部 哲史, 中村 みゆき, 内海 信幸

    水工学論文集 Annual journal of Hydraulic Engineering, JSCE   63   I_127 - 132   2018

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    Language：Japanese   Publisher：土木学会  

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  • PROJECTION OF THE CHANGES IN WEATHER POTENTIALLY AFFECTING TOURISM IN THE YAEYAMA ISLANDS UNDER GLOBAL WARMING Reviewed

    Nobuyuki Utsumi

    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)   74 ( 5 )   I_19 - 24   2018

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.2208/jscejer.74.i_19

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  • Relative contributions of weather systems to mean and extreme global precipitation Reviewed

    Utsumi, N., Kim, H., Kanae, S., Oki, T.

    Journal of Geophysical Research   122 ( 1 )   152 - 167   2017

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley-Blackwell  

    DOI： 10.1002/2016JD025222

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  • Which weather systems are projected to cause future changes in mean and extreme precipitation in CMIP5 simulations? Reviewed

    Utsumi, N., Kim, H., Kanae, S., Oki, T.

    Journal of Geophysical Research   121 ( 18 )   10 - 537   2016

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley-Blackwell  

    DOI： 10.1002/2016JD024939

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  • 平成27年9月関東・東北豪雨による茨城県常総市における鬼怒川洪水に関する調査及び考察

    芳村圭, 中村晋一郎, 鳩野美佐子, 向田清峻, 石塚悠太, 内海信幸, 木口雅司, KIM Hyungjun, 乃田啓吾, 牧野達哉, 鼎信次郎, 沖大幹

    土木学会論文集 B1(水工学)(Web)   72 ( 4 )   I_1273‐I_1278(J‐STAGE)   2016

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  • INVESTIGATION ON KINU-RIVER FLOOD DISASTER AROUND JOSO-CITY IBARAKI PREFECTURE OCCURRED BY KANTO AND TOHOKU HEAVY RAIN IN SEPTEMBER 2015

    YOSHIMURA Kei, MAKINO Tatsuya, KANAE Shinjiro, OKI Taikan, NAKAMURA Shinichiro, HATONO Misako, MUKAIDA Kiyotaka, ISHITSUKA Yuta, UTSUMI Nobuyuki, KIGUCHI Masashi, KIM Hyungjun, NODA Keigo

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   72 ( 4 )   I_1273 - I_1278   2016

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    &nbsp;Heavy precipitation event occurred for 8 to 10 September, 2015, over Tochigi and Ibaraki Prefectures caused an over-topping and an outburst of the left levee of Kinu-river in Wakamiyato and Misaka-cho districts in Joso city, Ibaraki prefecture around 6am and 1pm on 10 September, respectively. This precipitation event was caused by clustered linear rain bands influenced by Typhoon Etau (No 18) and Kilo (No 17). This paper aims to report our field investigations held on 10, 15, and 19 September, and to raise a couple of discussions for further improvement of flood control and river basin management in Japan.

    DOI： 10.2208/jscejhe.72.I_1273

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  • Changes in the weather system-wise proportions of global precipitation under climate change

    Utsumi Nobuyuki, Kim Hyungjun, Kanae Shinjiro, Oki Taikan

    Proceeding of Annual Conference   29   12 - 12   2016

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    Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    Future changes in the proportions of global precipitation by different weather systems (tropical cyclones, centers and fronts of extratropical cyclones, and others) are quantified based on objective weather system detection method and the climate model realizations (1980-1999 and 2080-2099) from the Coupled Model Intercomparison Project Phase 5 (CMIP5). It was found that the subtropics, particularly in the Pacific and North Atlantic, are the regions where the weather system-wise proportions of annual and extreme precipitation display notable changes, indicating distinct shifts in climate regimes. All of these regions have a common feature: they are substantially influenced by, and are in reach of, many weather systems in the present climate.

    DOI： 10.11520/jshwr.29.0_12

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  • Contribution of Pacific Japan Teleconnection to Different Weather Systems in Thailand Monsoon Domain

    Revel Menaka, Utsumi Nobuyuki, Yoshikawa Sayaka, Kanae Shinjiro

    Proceeding of Annual Conference   29   69 - 69   2016

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    Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    Thailand Monsoon Domain weather is govern by the Asian Summer monsoon which displays high variability in seasonal and interannual time scales. Different precipitation providing weather systems demonstrate different response to different weather related phenomenon such as Pacific-Japan (PJ) oscillation. Precipitation is decomposed into several systems namely tropical cyclones, extra tropical cyclones and fronts, and westward propagating disturbances, the precipitation which not related with any other systems categorized as &ldquo;others&rdquo;. Several objective detection methodologies were utilized in detecting different precipitation providing weather systems. The decomposed precipitation amounts related to different weather systems were correlated with PJ pattern and the correlations found to be in a positive phase in around Thailand. Positive PJ pattern tend increase precipitation events but not tropical cyclones and precipitation in late summer tend to enhanced by positive PJ phase. Dynamical response of the PJ pattern need to be further studied in association with different precipitation providing weather systems.&nbsp;&nbsp;

    DOI： 10.11520/jshwr.29.0_69

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  • Weather system-wise interpretation of future precupitation change

    UTSUMI Nobuyuki, KIM Hyungjun, OKI Taikan

    Proceeding of Annual Conference   27   100007 - 100007   2014

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    Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    The contribution of the changes of tropical cylones, extratropical cyclones, fronts, and other weather systems to the total precipitation change under warmer climate was analyzed. In the mid- and low latitudes, changes of the precipitation associated with extratropical cyclones and fronts were the dominant factor to explain the total precipitation change. In some regions (e.g. South Indian Ocean), the contribution of the changes of tropical cyclones was relatively large, although the model agreement for the projection was not high.

    DOI： 10.11520/jshwr.27.0_100007

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  • Climatological characteristics of fronts in the western North Pacific based on surface weather charts Reviewed

    Utsumi, N., Kim, H., Seto, S., Kanae, S., Oki, T.

    Journal of Geophysical Research   119 ( 15 )   9400 - 9418   2014

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley-Blackwell  

    DOI： 10.1002/2014JD021734

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  • Projection of future world water resources under SRES scenarios: an integrated assessment,Evaluation intégrée des projection des ressources en eau mondiales selon les scénarios SRES Reviewed

    Shen, Y., Oki, T., Kanae, S., Hanasaki, N., Utsumi, N., Kiguchi, M.

    Hydrological Sciences Journal   59 ( 10 )   1775 - 1793   2014

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1080/02626667.2013.862338

    Web of Science

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  • PROJECTION OF EXTREME PRECIPITATION INDUCED BY TYPHOONS -APPLICATION TO THE FLOOD-CONTROL PLAN IN THE KAGAMI RIVER OF KOCHI- Reviewed

    左藤智子, 楠原啓右, 今田由紀子, 内海信幸, 鼎信次郎

    土木学会論文集 B1(水工学)(Web)   69 ( 4 )   I.379-I.384 (J-STAGE)   2013

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  • A STUDY ON THE DIFFERENCE OF THE FUTURE ESTIMATES FOR DAILY EXTREME PRECIPITATION CAUSED BY THE SELECTION OF GCM, RCP EMISSION SCENARIO AND BIAS CORRECTION METHOD Reviewed

    渡部哲史, 内海信幸, 鼎信次郎, 瀬戸心太, 沖大幹, 平林由希子

    土木学会論文集 B1(水工学)(Web)   69 ( 4 )   I.385-I.390 (J-STAGE)   2013

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  • The relationship between extreme precipitation and surface air temperature in Bangladesh. Reviewed

    Ram Chandra SARKER, Masashi KIGUCHI, Nobuyuki UTSUMI, Kazuo OKI, Taikan OKI

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)   69 ( 4 )   I{\_}127 - I{\_}132   2013

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    Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejhe.69.i_127

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  • Evaluation of extreme rain estimates in the TRMM/PR standard product version 7 using high-temporal-resolution rain gauge datasets over Japan Reviewed

    Seto, S., Iguchi, T., Utsumi, N., Kiguchi, M., Oki, T.

    Scientific Online Letters on the Atmosphere   9 ( 1 )   98 - 101   2013

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.2151/sola.2013-022

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  • 平成23年7月新潟・福島豪雨による信濃川下流域での出水と被害の特徴―平成16年7月新潟・福島豪雨との比較を中心として―

    中村晋一郎, 内海信幸, 渡部哲史, 梯滋郎, 沖大幹

    水文・水資源学会誌   25 ( 2 )   113 - 121   2012.3

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  • TRMM/PRバージョン7プロダクトの強い雨 Reviewed

    瀬戸心太, 井口俊夫, 内海信幸, 沖大幹

    水工学論文集(CD-ROM)   56   ROMBUNNO.63   2012.2

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    Language：Japanese  

    J-GLOBAL

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  • 気候変動に伴う豪雨変化の要因分析における大気湿潤度の考慮 Reviewed

    内海信幸, 瀬戸心太, 鼎信次郎, 沖大幹

    水工学論文集(CD-ROM)   56   ROMBUNNO.71   2012.2

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    J-GLOBAL

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  • Decreasing precipitation extremes at higher temperatures in tropical regions Reviewed

    Maeda, E.E., Utsumi, N., Oki, T.

    Natural Hazards   64 ( 1 )   935 - 941   2012

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s11069-012-0222-5

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  • 日本における1時間降水量の極値と地上観測気温の関係 Reviewed

    内海信幸, 瀬戸心太, 鼎信次郎, 沖大幹

    水工学論文集(CD-ROM)   55   ROMBUNNO.52   2011.2

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    Language：Japanese  

    J-GLOBAL

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  • Does higher surface temperature intensify extreme precipitation? Reviewed

    Utsumi, N., Seto, S., Kanae, S., Maeda, E.E., Oki, T.

    Geophysical Research Letters   38 ( 16 )   2011

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1029/2011GL048426

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  • Relation between precipitation intensity and temperature inferred from in-situ and satellite observations over Japan

    Utsumi Nobuyuki, Seto Shinta, Kanae Shinjiro, Oki Taikan

    Proceeding of Annual Conference   23   120 - 120   2010

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    Language：Japanese   Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    DOI： 10.11520/jshwr.23.0.120.0

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  • Importance of wind-induced undercatch adjustment in a gauge-based analysis of daily precipitation over Japan Reviewed

    Nobuyuki Utsumi, Shinjiro Kanae, Hyungjun Kim, Shinta Seto, Taikan Oki, Tomoko Nitta, Yukiko Hirabayashi

    Hydrological Research Letters   2   47 - 51   2008

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Hydrology and Water Resources  

    We produced a new gauge-based analysis of daily precipitation over Japan from 1981 to 2000 on a 0.01° grid. Wind-induced undercatch was adjusted at each observation station, and orographic effects were considered in the process of spatial interpolation from station data to the gridded product. The resulting gridded gauge-based analysis of precipitation was validated against observed river discharge data. The validation demonstrated that the product is reasonable, mostly because of the undercatch adjustment. Based on the resulting product, Japan receives nearly 2000 mm/year of precipitation on average, which is approximately 10% larger than commonly thought.

    DOI： 10.3178/hrl.2.47

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  • Projection of future world water resources under SRES scenarios: Water withdrawal Reviewed

    Shen, Y., Oki, T., Utsumi, N., Kanae, S., Hanasaki, N.

    Hydrological Sciences Journal   53 ( 1 )   11 - 33   2008

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1623/hysj.53.1.11

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  • 温暖化時の水資源影響評価のための全球統合水資源モデルの開発 Reviewed

    花崎直太, 内海信幸, 山田智子, SHEN Yanjun, BENGTSSON Magnus, 鼎信次郎, 大瀧雅寛, 沖大幹

    水工学論文集(CD-ROM)   51   ROMBUNNO.39 - 234   2007.2

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    A global water resources model was developed to assess the impact of climate change on water resources. The model consists of six modules, namely, land surface, river, agriculture, reservoir operation, environmental flow, and irrigation. One of the primary purposes of this model is to analyze availability of water resources at daily temporal resolution. We estimated the global distribution of water stressed area due to not only the limitation of annual total water resources but also the strong seasonality of them. The results show that the number of population living under water stressed condition reaches its peak around 2050 and remains high until the end of 21st century under SRES A1B scenario.

    DOI： 10.2208/prohe.51.229

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  • Future global water resources assesment based on global waming scenario

    Utsumi Nobuyuki, Shen Yanjun, Oki Taikan, Hanasaki Naota, Kanae Shinjiro, Kawashima Hiroyuki

    Proceeding of Annual Conference   19   118 - 118   2006

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    Publisher：THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    DOI： 10.11520/jshwr.19.0.118.0

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Books

  • ゆらぐ水環境を捉える : 水共生社会の実現をめざして

    荒谷, 邦雄, 藤岡, 悠一郎, 渡部, 哲史, 田尻, 義了, 松本, 朋哉, 鬼丸, 武士（ Role： Contributor第1章「地球にとっての水」（渡部哲史・内海信幸），pp. 1–20．）

    九州大学出版会  2026.4  （ ISBN:9784798503981 ）

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    Total pages：xviii, 168p   Language：Japanese  

    CiNii Books

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Research Projects

  • Integrated Sciences for Sustainable Human-Aqua Environment

    Grant number：21H05177  2021.9 - 2026.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Transformative Research Areas (A)

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    Grant amount：\112190000 （ Direct Cost: \86300000 、 Indirect Cost：\25890000 ）

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  • 水共生学の創生に向けた水とその周辺環境情報の創出と展開

    Grant number：21H05178  2021.9 - 2026.3

    日本学術振興会  科学研究費助成事業  学術変革領域研究(A)

    渡部 哲史, 市川 香, 花崎 直太, 田尻 義了, 丸谷 靖幸, 内海 信幸, 永井 信, 金 炯俊, 上原 克人, 矢野 真一郎, 駒井 克昭, 中下 慎也

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    Grant amount：\216840000 （ Direct Cost: \166800000 、 Indirect Cost：\50040000 ）

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  • 気象システムに着目した東アジアにおける洪水の将来変化メカニズムの解明

    Grant number：21H01442  2021.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    内海 信幸, 渡部 哲史, 金 炯俊

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    Grant amount：\13000000 （ Direct Cost: \10000000 、 Indirect Cost：\3000000 ）

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  • 気象システムに着目した東アジアにおける洪水の将来変化メカニズムの解明

    Grant number：23K20970  2021.4 - 2025.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    内海 信幸, 渡部 哲史, 金 炯俊

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    Grant amount：\13000000 （ Direct Cost: \10000000 、 Indirect Cost：\3000000 ）

    2023年度は、前年度に開発・実装した東アジアの夏季モンスーンの降水（梅雨等）の検出手法を用いた解析を行った。気候データとしては前年度に整理・検討を行った複数の気候シミュレーションデータのうち、 Community Earth System Model 1 Large Ensemble Simulations (CESM-LE)を用いた。
    1958年～2015年を対象に、東アジアの夏季モンスーンの降水（梅雨等）の変化を分析した。まず再解析データ（JRA55）と観測された降水データを分析したところ、東アジアの夏季モンスーンの降水が対象期間で増加していたことが明らかになった。
    さらにCESM-LEの２種類のアンサンブルシミュレーション実験（温室効果ガス排出による気候変動の影響を考慮したアンサンブルシミュレーションと、人間による温室効果ガス排出を入れない自然状態のアンサンブルシミュレーション）を比較した。その結果、温室効果ガス排出による地球温暖化が東アジアの夏季モンスーンの降水量の増加に寄与していることが明らかになった。また、そのメカニズムを分析すると、水蒸気量の増加と北西太平洋の亜熱帯高気圧の強化が、観測された降水量の増加につながっていることが示された。

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  • 衛星観測による瞬時値情報を用いた時間積算降水量推定手法の開発

    Grant number：19K15096  2019.4 - 2023.3

    日本学術振興会  科学研究費助成事業  若手研究

    内海 信幸

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    Grant amount：\4290000 （ Direct Cost: \3300000 、 Indirect Cost：\990000 ）

    本研究は、瞬時値しか得られない人工衛星による降水観測情報から、実用上求められる時間スケールの時間積算降水量を推定する手法を開発するものである。
    今年度は低軌道衛星搭載のマイクロ波放射計で推定した降水量推定値から降水量マップを作製する際の不確実性の評価を行った。
    降水量マップの作製では地球を周回する人工衛星の軌道に沿った降水量推定を行い、さらに衛星センサ間で特性が異なる場合は整合性を確保するための補正を行う。その後、雲移動ベクトルなどを利用して時空間的に移動させてマップ化する。最終的な降水量マップにはこうした各ステップの不確実性が積算される。
    本研究では米国NASAによる衛星降水量マップIntegrated Multi-satellitE Retrievals for GPM (IMERG)の研究グループの協力を得て、降水量マップの不確実性を作製プロセスのステップ別に評価した。これにはIMERG-Testbedを用いた。IMERG-Testbedは、降水量マップ作製プロセスの各ステップで用いる手法やデータを任意に入れ替えることができるシステムである。手法やデータの様々な組み合わせで降水量マップアンサンブルを作製することで、各ステップ由来の不確実性を評価した。
    結果、マイクロ波放射計による降水量推定の不確実性が最も大きかったが、センサ間の整合性確保のための補正に由来する不確実性がそれと同程度の不確実性を生む場合があることが示された。研究成果は世界気候研究計画（WCRP）の報告書で発表された。

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  • Data-driven Seasonal Hydrologic Prediction Using Earth Observing Satellites

    Grant number：18KK0117  2018.10 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

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    Grant amount：\17810000 （ Direct Cost: \13700000 、 Indirect Cost：\4110000 ）

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  • Investigating precipitation vertical profiles associated with various atmospheric conditions based on satellite observations

    Grant number：16H06725  2016.8 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Research Activity Start-up

    Utsumi Nobuyuki, Kim Hyungjun

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    Grant amount：\2990000 （ Direct Cost: \2300000 、 Indirect Cost：\690000 ）

    Weather system classification algorithm was restructured so that it works for various spatial/temporal resolutions. Also, the database of precipitation vertical profiles for various precipitation types and lower atmospheric conditions was developed based on satellite precipitation radar (TRMM/PR) observations. A new method to estimate the subhourly surface rain accumulation using instantaneous observation was proposed. A proof-of-concept study for this method was carried out based on the developed dataset and high-temporal resolution rain gauge observations. It was shown that time accumulation of surface rainfall on subhourly time scales can be estimated well by taking into account the vertical rain profile information.

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