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Research on hydrometeors assimilation methods to elucidate the mechanisms of torrential rain development

Research Project

Project/Area Number 21K03669
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17020:Atmospheric and hydrospheric sciences-related
Research InstitutionJapan, Meteorological Research Institute

Principal Investigator

Ikuta Yasutaka  気象庁気象研究所, 気象観測研究部, 主任研究官 (80878249)

Co-Investigator(Kenkyū-buntansha) 澤田 謙  気象庁気象研究所, 気象観測研究部, 主任研究官 (10847205)
堀田 大介  気象庁気象研究所, 気象観測研究部, 主任研究官 (60805365)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywordsデータ同化 / 集中豪雨 / 深層学習 / 数値天気予報 / 水物質の背景誤差 / アンサンブル予測 / 豪雨の発達機構
Outline of Research at the Start

現業数値気象予報センターのデータ同化システムは、雲や雨などの水物質を解析変数としていない。そのため水物質と気温や気圧などの気象場と気象学的な整合がとれておらず、集中豪雨の再現精度の低下の原因となっている。この問題を解決するには水物質を解析変数として扱うために水物質と気象場の予測誤差統計情報である背景誤差共分散行列を求める必要がある。しかし、水物質の予測誤差は、背景となる気象場との間に強い非線形関係があるため従来の統計的アプローチに基づいたモデル化が困難であった。本研究では、様々な気象場に応じた背景誤差共分散行列を深層学習で求めデータ同化に利用し豪雨発達機構を解明する。

Outline of Final Research Achievements

This study aims to estimate background errors according to various meteorological conditions using deep learning and utilize them in data assimilation to elucidate the mechanism of torrential rain development. Conventional methods for estimating background errors have been challenging difficulties in achieving high accuracy due to the diversity of cloud precipitation processes. Therefore, we developed a method to generate background error using a type of deep learning called conditional generative adversarial networks. By using the generated background errors to investigate the assimilation impact of rain and snow mixing ratios, we demonstrated superior analytical accuracy compared to conventional methods. Furthermore, to elucidate the reasons for errors in forecasts, we introduced new raindrop size distributions and non-spherical snow particles into the numerical model. As a result, an improvement in the predictive accuracy of hydrometeors within precipitation systems was achieved.

Academic Significance and Societal Importance of the Research Achievements

この研究課題の成果は、気象レーダーや地球観測衛星データ同化技術の進展をもたらし、数値天気予報モデルによる集中豪雨の内部構造の精密な再現を可能とする。この数値モデルの現象再現性の向上は、顕著現象の原因となる積乱雲の発生や発達機構の高精度な分析を可能とする。豪雨の発達機構に関する理解の深化は、気象学の更なる進歩に必要不可欠である。また、数値天気予報モデルの初期値の精度向上は、日々の数値天気予報の精度も向上させる。特に、モデルの水物質の再現性能の向上は、水害や土砂災害の原因となる集中豪雨の予測精度向上に直結し、防災情報の高度化に寄与する。

Report

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

    (20 results)

All 2024 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (17 results) (of which Int'l Joint Research: 9 results)

  • [Journal Article] Impact of Assimilation of the Tropical Cyclone Strong Winds Observed by Synthetic Aperture Radar on Analyses and Forecasts2024

    • Author(s)
      Ikuta Yasutaka、Shimada Udai
    • Journal Title

      Monthly Weather Review

      Volume: 152 Issue: 4 Pages: 1007-1025

    • DOI

      10.1175/mwr-d-23-0103.1

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Determining the Impact of Boundary Layer Schemes on the Secondary Circulation of Typhoon Faxai Using Radar Observations in the Gray Zone2023

    • Author(s)
      Ikuta Yasutaka、Sawada Masahiro、Satoh Masaki
    • Journal Title

      Journal of the Atmospheric Sciences

      Volume: 80 Issue: 4 Pages: 961-981

    • DOI

      10.1175/jas-d-22-0169.1

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Assimilation of shipborne precipitable water vapour by Global Navigation Satellite Systems for extreme precipitation events2021

    • Author(s)
      Yasutaka Ikuta, Hiromu Seko, Yoshinori Shoji
    • Journal Title

      Quarterly Journal of the Royal Meteorological Society

      Volume: 148 Issue: 742 Pages: 57-75

    • DOI

      10.1002/qj.4192

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Generating background error covariances for hydrometeors with conditional generative adversarial networks2023

    • Author(s)
      Yasutaka Ikuta
    • Organizer
      9thInternational Symposium on Data Assimilation
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Evaluation of cloud microphysics scheme using ground-based micro-rain radar in senjo-kousuitai event2023

    • Author(s)
      Yasutaka Ikuta
    • Organizer
      JpGU meeting 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effects of introducing three types of snow particle shapes and bimodal raindrops size distribution into cloud microphysics scheme2023

    • Author(s)
      Yasutaka Ikuta, Masaki Satoh, Woosub Roh, Shuhei Matsugishi, Naomi Kuba, Tatsuya Seiki, Akihito Umehara, Hisaki Eitoa
    • Organizer
      6th International Workshop on Nonhydrostatic Model
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] チャンネル間・時間相関を含む観測誤差共分散行列を用いた気象庁地上設置型マイクロ波放射計の輝度温度高頻度同化2023

    • Author(s)
      幾田泰酵、瀬古弘、川畑拓矢、石元裕史、荒木健太郎、田尻拓也、吉本浩一、鈴木健司、中山和正、酒匂啓司
    • Organizer
      気象学会2023年度秋季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] レーダー屈折率時間変化量の推定時のパラメータと観測高度2023

    • Author(s)
      瀬古弘, 山内洋, 梅原章仁, 佐藤英一, 酒井哲, 足立アホロ
    • Organizer
      日本気象学会2023年度春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] メソNAPEXを用いたPOTEKAの同化実験2023

    • Author(s)
      瀬古弘, 幾田泰酵, 川畑拓矢, 佐藤芳昭, 笹川悠, 大森志郎
    • Organizer
      日本気象学会2023年度秋季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] メソNAPEXを用いた 地上マイクロ波放射計観測網の可降水量と 航空機動態情報(MODE-Sデータ)の 同化実験2023

    • Author(s)
      瀬古弘, 幾田泰酵, 川畑拓矢, 石元裕史, 荒木健太郎, 田尻拓也, 吉本浩一, 古賀禎, 瀬之口敦, 吉原貴之
    • Organizer
      日本気象学会2023年度秋季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Gaussian Assimilation of non-Gaussian Image Data via Pre-Processing by Variational Auto-Encoder (VAE)2023

    • Author(s)
      Daisuke Hotta
    • Organizer
      10th International Congress on Industrial and Applied Mathematics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] VAE as a Stochastic Multidimensional Extension to Gaussian Anamorphosis2023

    • Author(s)
      Daisuke Hotta, Bun-Kim San,Loik Berre, and Vincent Chabot
    • Organizer
      9th International Symposium on Data Assimilation
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] OctaHEALPix grid: a new, equal-area quadrilateral grid on a sphere which admits spherical harmonics transform2023

    • Author(s)
      Daisuke Hotta, Milan Klower, and Sam Hatfield
    • Organizer
      6th International Workshop on Nonhydrostatic Model
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Evaluation and improvement of cloud microphysics scheme using ground-based polarimetric radar and disdrometer observations2023

    • Author(s)
      Yasutaka Ikuta
    • Organizer
      ICCP-GSRA Workshop 2023, jointly with The 2nd EarthCARE Modeling Workshop
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 地上設置型マイクロ波放射計の4次元同化2022

    • Author(s)
      幾田泰酵
    • Organizer
      気象学会2022年度秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 二重偏波レーダーを参照値とした雲微物理スキームの精緻化2022

    • Author(s)
      幾田泰酵
    • Organizer
      第24回 非静力学モデルに関するワークショップ
    • Related Report
      2022 Research-status Report
  • [Presentation] New Variational Data Assimilation System for Regional Model at JMA2021

    • Author(s)
      Yasutaka Ikuta
    • Organizer
      WCRP-WWRP Symposium on Data Assimilation and Reanalysis
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Assimilation of GPM DPR Spectral Latent Heating using Situation Dependent Observation Error Covariance with Spatial Correlation in Kalman Gain2021

    • Author(s)
      Yasutaka Ikuta
    • Organizer
      EUMETSAT Meteorological Satellite Conference 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 1km格子 asuca を用いた豪雨をもたらした降水系の流跡線解析2021

    • Author(s)
      瀬古弘
    • Organizer
      第23回非静力学モデルに関するワークショップ
    • Related Report
      2021 Research-status Report
  • [Presentation] メソアンサンブル予報を用いた豪雨の相関解析2021

    • Author(s)
      瀬古弘
    • Organizer
      日本気象学会2021年度春季大会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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