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Prediction of Future Changes in the Mechanism of Heavy Rainfall in the Baiu Season by a Pseudo Global Warming Method Using Observational data

Research Project

Project/Area Number 21K20449
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
Research InstitutionKyoto University

Principal Investigator

Naka Yukari  京都大学, 防災研究所, 助教 (30909445)

Project Period (FY) 2021-08-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords梅雨前線 / 線状対流系豪雨 / 地球温暖化 / 擬似温暖化実験 / 発生メカニズム / 集中豪雨 / 線状対流系 / 観測情報 / 温暖化 / メカニズム / 数値モデル
Outline of Research at the Start

近年,梅雨期の集中豪雨で毎年のように日本各地で甚大な被害が発生している.本研究は,こうした梅雨集中豪雨の10年後,20年後,…という時間連続的な将来変化予測と現象メカニズムの解明,そしてメカニズムの将来変化予測を目指すものである.本研究は,従来の多くの気候変動研究とは異なり,将来予測に現在の観測情報を利用して新たな温暖化予測手法を構築し,その手法を用いて上記の課題解決を目指すという点で非常に独創性が高い.これらの研究成果は,本研究の新たな温暖化予測手法を通して,科学的に重要な梅雨豪雨メカニズムの将来予測を実現するとともに,防災・気候変動適応計画へまでの応用も期待される.

Outline of Final Research Achievements

We conducted a pseudo global warming experiment for a past heavy rainfall during Baiu season (line-shaped convective system) and found that the Bulk-Richardson number, an index representing the ratio of buoyancy to turbulence, was constant in all past and future experiments.
Based on this finding, in addition to future projections, we analyzed past events of line-shaped convection systems using Radar-AMeDAS rainfall data. The results of the analysis of the atmospheric environment of past line-shaped convection systems classified into (A) systems generated by large-scale convergence by fronts and (B) localized systems generated in isolation from fronts indicate that the bulk Richardson number is more important for (B) localized and self-organized systems.

Academic Significance and Societal Importance of the Research Achievements

本研究は,近年学術的にも社会的にも注目されている,梅雨前線に伴う線状対流系豪雨に着目し,そのメカニズム解明及び将来予測に取り組んだ研究である.特に本研究は,従来行われていたような気候予測情報を用いて将来予測を行うというだけでなく,過去に発生した事例の理解に基づきメカニズムそのものの将来予測を行うという点で独自性が高く,気象学・気候学・工学全てに対して本研究が持つ学術的意義は大きいものである.本研究課題で十分に解明できなかった課題についても,今後引き続き研究を進めていく予定である.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (19 results)

All 2024 2023 2022 2021

All Journal Article (7 results) (of which Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (12 results) (of which Int'l Joint Research: 6 results)

  • [Journal Article] SENSITIVITY EXPERIMENTS OF ATMOSPHERIC STABILITY AND WATER VAPOR INFLOW FOR THE 2012 KAMEOKA HEAVY RAINFALL EVENT2024

    • Author(s)
      NAKA Yukari、KAMIYA Taiga、NAKAKITA Eiichi
    • Journal Title

      Japanese Journal of JSCE

      Volume: 80 Issue: 16 Pages: n/a

    • DOI

      10.2208/jscejj.23-16002

    • ISSN
      2436-6021
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] INTEGRATED ANALYSIS OF CONDITIONS FOR OCCURRENCE AND DEVELOPMENT OF PAST LINE-SHAPED CONVECTIVE SYSTEMS WITH STAGNANT FRONT CONSIDERING SPATIO-TEMPORAL CHARACTERISTICS2024

    • Author(s)
      NAKA Yukari、FUKUDA Kana、NAKAKITA Eiichi
    • Journal Title

      Japanese Journal of JSCE

      Volume: 80 Issue: 16 Pages: n/a

    • DOI

      10.2208/jscejj.23-16006

    • ISSN
      2436-6021
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Comprehensive Future Projections for the Line-shaped Convective System Associated with Baiu front in Japan under RCP Scenarios Using Regional Climate Model and Pseudo Global Warming Experiments2023

    • Author(s)
      Yukari Naka and Eiichi Nakakita
    • Journal Title

      Frontiers in Earth Science

      Volume: 11:1093543 Pages: 1-18

    • DOI

      10.3389/feart.2023.1093543

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Convection-Permitting Models for Climate Research2022

    • Author(s)
      Takayabu Izuru、Rasmussen Roy、Nakakita Eiichi、Prein Andreas、Kawase Hiroaki、Watanabe Shun-Ichi、Adachi Sachiho A.、Takemi Tetsuya、Yamaguchi Kosei、Osakada Yukari、Wu Ying-Hsin
    • Journal Title

      Bulletin of the American Meteorological Society

      Volume: 103 Issue: 1 Pages: E77-E82

    • DOI

      10.1175/bams-d-21-0043.1

    • Related Report
      2021 Research-status Report
  • [Journal Article] Recent nationwide climate change impact assessments of natural hazards in Japan and East Asia2021

    • Author(s)
      Mori Nobuhito、Takemi Tetsuya、Tachikawa Yasuto、Tatano Hirokazu、Shimura Tomoya、Tanaka Tomohiro、Fujimi Toshimi、Osakada Yukari、Webb Adrean、Nakakita Eiichi
    • Journal Title

      Weather and Climate Extremes

      Volume: 32 Pages: 100309-100309

    • DOI

      10.1016/j.wace.2021.100309

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] ANALYSIS ON THE IMPACT OF AMBIENT DISTURBANCES ON PSEUDO GLOBAL WARMING RESULTS FOR LINE-SHAPED CONVECTIVE SYSTEM AND ATMOSPHERIC INDICES2021

    • Author(s)
      OSAKADA Yukari、NAKAKITA Eiichi
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

      Volume: 77 Issue: 2 Pages: I_1255-I_1260

    • DOI

      10.2208/jscejhe.77.2_I_1255

    • NAID

      130008160040

    • ISSN
      2185-467X
    • Related Report
      2021 Research-status Report
  • [Journal Article] TIME-SEAMLESS FUTURE CHANGE ANALYSIS ON BAIU RAINFALL AND ATMOSPHERIC CONDITIONS DUE TO GLOBAL WARMING2021

    • Author(s)
      NAKAKITA Eiichi、HARADA Machi、OSAKADA Yukari
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)

      Volume: 77 Issue: 2 Pages: I_1273-I_1278

    • DOI

      10.2208/jscejhe.77.2_I_1273

    • NAID

      130008160027

    • ISSN
      2185-467X
    • Related Report
      2021 Research-status Report
  • [Presentation] Integrated Physical Analysis of Past Line-shaped Convective Systems for Mechanisms Investigation2023

    • Author(s)
      Kana Fukuda, Yukari Naka, and Eiichi Nakakita
    • Organizer
      The 15th International Conference on Mesoscale Convective Systems (ICMCS-XV)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Changing Pathways of Atmospheric Rivers on Mesoscale: The impact of Atmospheric Stability on the Pathway to Localized Heavy Rainfall in Japan2023

    • Author(s)
      Taiga Kamiya, Yukari Naka, and Eiichi Nakakita
    • Organizer
      American Geophysical Union Fall Meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Future projections in rainfall and frontal structure during the Baiu season in Japan using 150-year continuous simulations2023

    • Author(s)
      Yukari Naka, Machi Harada and Eiichi Nakakita
    • Organizer
      The 15th International Conference on Mesoscale Convective Systems (ICMCS-XV)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 時空間特性を考慮した停滞前線性線状対流系の過去事例における発生・発達条件の統合的解析2023

    • Author(s)
      仲ゆかり・福田果奈・中北英一
    • Organizer
      第68回水工学講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 梅雨前線構造の温暖化に伴う21世紀末への長期変化に関する物理的解析2023

    • Author(s)
      仲ゆかり・原田茉知・中北英一
    • Organizer
      気象学会2023年度春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] メカニズム解明に向けた線状対流系過去事例群の統合的物理解析2023

    • Author(s)
      仲ゆかり・福田果奈・中北英一
    • Organizer
      令和四年度京都大学防災研究所研究発表講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] The future projections on line-shaped convective system associated with Baiu front in Japan under RCP scenarios2022

    • Author(s)
      Yukari Osakada and Eiichi Nakakita
    • Organizer
      The 9th International Conference on Water Resources and Environment Research
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Future changes in duration and accumulated rainfall of line-shaped extreme rainfall associated with Baiu front considering its spacio-temporal characteristics2022

    • Author(s)
      Yukari Osakada and Eiichi Nakakita
    • Organizer
      19th Asia Oceania Geosciences Society Annual Meeting
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 梅雨前線による線状対流系の時空間スケール特性及び将来変化2022

    • Author(s)
      仲ゆかり・中北英一
    • Organizer
      水文水資源学会/日本水文科学会2022年度研究発表会
    • Related Report
      2022 Research-status Report
  • [Presentation] 線状対流系の擬似温暖化実験に周辺擾乱が与える影響と環境場指標の解析2021

    • Author(s)
      小坂田ゆかり
    • Organizer
      第66回水工学講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] RCP8.5及びRCP2.6シナリオに基づく線状対流系の擬似温暖化実験と影響メカニズム2021

    • Author(s)
      小坂田ゆかり
    • Organizer
      水文水資源学会/日本水文科学会2021年度総会・研究発表会
    • Related Report
      2021 Research-status Report
  • [Presentation] The impact assessment of global warming on localized heavy rainfall associated with Baiu front under RCP scenarios2021

    • Author(s)
      Yukari Osakada
    • Organizer
      10th DPRI-NCDR Workshop
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-10-22   Modified: 2025-01-30  

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