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Developing 2-way feedback nested-domain LETKF data assimilation system and application to high-resolution typhoon analyses and forecasts

Research Project

Project/Area Number 17K14396
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Lien GuoYuan  国立研究開発法人理化学研究所, 計算科学研究センター, 特別研究員 (50744257)

Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Discontinued (Fiscal Year 2018)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsデータ同化 / 台風 / 気象学
Outline of Annual Research Achievements

This project ended in the middle of the second fiscal year because the principal investigator moved outside of Japan. During the one-year and four-month period of this project, the online nested-domain LETKF has been newly implemented in the SCALE-LETKF system. Combined with the existing online nested-domain function in the SCALE-RM model, the SCALE-LETKF has become capable of running both data assimilation cycles and extended ensemble forecasts with multiple nested domains in an online framework. The design is efficient in both the computational and human-effort aspects.
The data assimilation experiments with the September 2015 Kanto-Tohoku Heavy Rainfall case were conducted using this new online nesting function. Compared with the old offline downscaling experiment in Lien et al. (2017, SOLA), the online nested-domain experiment led to improved forecast skill, due to further performing data assimilation in the inner high-resolution domain and frequent coupling of the two domains in the model forecast steps.
The principal investigator also coauthored two papers by Honda et al. (2018a,b, MWR, JGR) for typhoon data assimilation studies using this SCALE-LETKF system.
All source code developed in this project is publicly available at https://github.com/gylien/scale-letkf, with an MIT license.
Due to early termination of this project, the 2-way feedback LETKF analysis with multiple nested domains is still under development. The principal investigator may be able to continue working on it and concluding the work in his next position.

Report

(2 results)
  • 2018 Annual Research Report
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2018 2017 Other

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 7 results,  Invited: 4 results) Remarks (1 results)

  • [Journal Article] Assimilating all-sky Himawari-8 satellite infrared radiances: A case of Typhoon Soudelor (2015)2018

    • Author(s)
      Takumi Honda, Takemasa Miyoshi, Guo-Yuan Lien, Seiya Nishizawa, Ryuji Yoshida, Sachiho A. Adachi, Koji Terasaki, Kozo Okamoto, Hirofumi Tomita, and Kotaro Bessho
    • Journal Title

      Monthly Weather Review

      Volume: 146 Issue: 1 Pages: 213-229

    • DOI

      10.1175/mwr-d-16-0357.1

    • NAID

      120006382332

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Assimilation of Himawari-8 all-sky radiances every 10 minutes: Impact on precipitation and flood risk prediction2018

    • Author(s)
      Takumi Honda, Shunji Kotsuki, Guo-Yuan Lien, Yasumitsu Maejima, Kozo Okamoto, and Takemasa Miyoshi
    • Journal Title

      Journal of Geophysical Research: Atmospheres

      Volume: 123 Issue: 2 Pages: 965-976

    • DOI

      10.1002/2017jd027096

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Issues regarding maintaining ensemble spreads, balance, and high-resolution information in rapid-update-cycle radar data assimilation with the LETKF2018

    • Author(s)
      Guo-Yuan Lien, and Takemasa Miyoshi
    • Organizer
      JpGU Meeting 2018, Chiba
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The computational aspect of the SCLAE-LETKF data assimilation system for rapid-update-cycle, high-resolution radar data assimilation2018

    • Author(s)
      Guo-Yuan Lien, Seiya Nishizawa, Ryuji Yoshida, Hisashi Yashiro, Tatiana Martsinkevich, Takumi Honda, Shigenori Otsuka, Takemasa Miyoshi, Hirofumi Tomita, and Yutaka Ishikawa
    • Organizer
      JpGU Meeting 2018, Chiba
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Issues regarding maintaining ensemble spreads, balance, and high-resolution information in rapid-update-cycle radar data assimilation with the LETKF2018

    • Author(s)
      Guo-Yuan Lien, and Takemasa Miyoshi
    • Organizer
      6th International Symposium on Data Assimilation, Munich, Germany
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 30-second-cycle LETKF assimilation of phased array weather radar data2017

    • Author(s)
      Guo-Yuan Lien, Takemasa Miyoshi, and Juan Ruiz
    • Organizer
      JpGU-AGU Joint Meeting 2017, Chiba
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Implicit thinning and localization of dense observation data in the LETKF: A case of phased array weather radar2017

    • Author(s)
      Guo-Yuan Lien, and Takemasa Miyoshi
    • Organizer
      JpGU-AGU Joint Meeting 2017, Chiba
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 30-second-cycle LETKF assimilation of phased array weather radar data2017

    • Author(s)
      Guo-Yuan Lien, and Takemasa Miyoshi
    • Organizer
      South China Sea Science Conference 2017, Kaohsiung, Taiwan
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 30-second-cycle LETKF assimilation of phased array weather radar data2017

    • Author(s)
      Guo-Yuan Lien, Juan Ruiz, and Takemasa Miyoshi
    • Organizer
      Seventh International WMO Symposium on Data Assimilation, Florianopolis, Brazil
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Remarks] SCALE-LETKF code repository on GitHub

    • URL

      https://github.com/gylien/scale-letkf/

    • Related Report
      2018 Annual Research Report

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Published: 2017-04-28   Modified: 2019-12-27  

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