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Development of new 4-dimnesional variational data assimilation technique using Monte-Carlo method.

Research Project

Project/Area Number 19740292
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionKyoto University

Principal Investigator

ISHIKAWA Yoichi  Kyoto University, 大学院・理学研究科, 助教 (70335298)

Project Period (FY) 2007 – 2009
Project Status Completed (Fiscal Year 2009)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥600,000)
Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2008: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2007: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywords海洋物理 / データ同化 / 4次元変分法 / アンサンブル法 / 非線形問題 / 大規模数値計算 / 大気海洋結合モデル / 生態系モデル / 境界層モデル / 海洋科学 / カルマンフィルター / 粒子フィルター
Research Abstract

The new data assimilation scheme is developed called as "ensemble 4-dimensional ariational method". This method can obtain the macroscopic gradients of cost function, hile the classical adjoint method obtains microscopic gradients. As a result, this new cheme can apply for strong nonlinear system. In this study, the efficiency of the new cheme is confirmed by the assimilation system for marine ecosystem model. In ddition, the new method is applied for atmosphere-ocean coupled models.

Report

(4 results)
  • 2009 Annual Research Report   Final Research Report ( PDF )
  • 2008 Annual Research Report
  • 2007 Annual Research Report
  • Research Products

    (19 results)

All 2010 2009 2008 2007

All Journal Article (9 results) (of which Peer Reviewed: 9 results) Presentation (8 results) Book (2 results)

  • [Journal Article] Specifying Air-Sea Exchange Coefficients in the High-Wind Regime of a Mature Tropical Cyclone by an Adjoint Data Assimilation Method.2010

    • Author(s)
      Ito, K., Y. Ishikawa, T. Awaji
    • Journal Title

      SOLA Vol.6

      Pages: 13-16

    • NAID

      130004940909

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Specifying Air-Sea Exchange Coefficients in the High-Wind Regime of a Mature Tropical Cyclone by an Adjoint Data Assimilation Method.2010

    • Author(s)
      Ito, K., Y.Ishikawa, T.Awaji
    • Journal Title

      SOLA 6

      Pages: 13-16

    • NAID

      130004940909

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High-resolution synthetic monitoring by a 4-dimensional variational data assimilation system in the northwestern North Pacific.2009

    • Author(s)
      Ishikawa, Y., T. Awaji, T. Toyoda, T. In, K. Nishina, T. Nakayama, S. Shima, S. Masuda
    • Journal Title

      J. Marine System

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] The role of westerly wind bursts in the ENSO recharge paradigm.2009

    • Author(s)
      Masuda, S., Y. Shikama, T. Awaji, Y. Ishikawa, T. Toyoda
    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Applications in Coastal Modeling and Forecasting.2009

    • Author(s)
      De Mey., P., P. Craig, F. Davidson, C.A. Edwards, Y. Ishikawa, J.C. Kindle, R. Proctor, K.R. Thompson, J. Zhu.
    • Journal Title

      Oceanography

      Pages: 198-205

    • Related Report
      2009 Final Research Report
    • Peer Reviewed
  • [Journal Article] Applications in Coastal Modeling and Forecasting.2009

    • Author(s)
      De Mey., P., P.Craig, F.Davidson, C.A.Edwards, Y.Ishikawa, J.C.Kindle, R.Proctor, K.R.Thompson, J.Zhu
    • Journal Title

      Oceanography 22

      Pages: 198-205

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High-resolution synthetic monitoring by-a 4-dimensional variational data assimilation system in the northwestern North Pacific2009

    • Author(s)
      Ishikawa, Y., T. Awaji, T. Toyoda, T. In, K. Nishina, T. Nakayama, S. Shima, S. Masuda
    • Journal Title

      J. Marine System

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The role of westerly wind bursts in the ENSO recharge paradigm2009

    • Author(s)
      Masuda, S., Y. Shikama, T. Awaji, Y. Ishikawa. and T. Toyoda
    • Journal Title

      J. Geophys. Res. 114

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High-resolution synthetic monitoring by a 4-dimensional variational data assimilation system in the northwestern North Pacific2008

    • Author(s)
      Ishikawa, Y., T. Awaji, T. Toyoda, T. In, K. Nishina, T. Nakayama, and S. Shima
    • Journal Title

      J. Marine. Sys. 71(印刷中)

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Presentation] IMPACT OF 4D-VAR ASSIMILATION PRODUCTS ON BIO-GEOCHEMICAL SIMULATION2009

    • Author(s)
      Ishikawa, Y., T. Awaji, T. Toyoda, H. Igarashi
    • Organizer
      The 5th WMO International Symposium on Data Assimilation
    • Place of Presentation
      Melbourne, Australia
    • Year and Date
      2009-10-09
    • Related Report
      2009 Final Research Report
  • [Presentation] IMPACT OF 4D-VAR ASSIMILATION PRODUCTS ON BIO-GEOCHEMICAL SIMULATION2009

    • Author(s)
      Ishikawa, Y.
    • Organizer
      The 5th WMO International Symposium on Data Assimmilation
    • Place of Presentation
      メルボルン.オーストラリア
    • Year and Date
      2009-10-09
    • Related Report
      2009 Annual Research Report
  • [Presentation] IMPACT OF 4D-VAR ASSIMILATION PRODUCTS ON BIO-GEOCHEMICAL SIMULATION2008

    • Author(s)
      Ishikawa. Y., T. Awaji, T. Toyoda, H. Igarashi
    • Organizer
      Final GODAE Symposium 2008
    • Place of Presentation
      Nice, France
    • Year and Date
      2008-11-14
    • Related Report
      2009 Final Research Report
  • [Presentation] IMPACT OF 4D-VAR ASSIMILATION PRODUCTS ON BIO-GEOCHEMICAL SIMULATION2008

    • Author(s)
      Y. Ishikawa
    • Organizer
      Final GODAE Symposium 2008
    • Place of Presentation
      ニース、フランス
    • Year and Date
      2008-11-14
    • Related Report
      2008 Annual Research Report
  • [Presentation] アンサンブルベースの4次元変分法2008

    • Author(s)
      石川洋一, 淡路敏之
    • Organizer
      日本海洋学会秋季大会
    • Place of Presentation
      広島県呉市
    • Year and Date
      2008-09-26
    • Related Report
      2009 Final Research Report 2008 Annual Research Report
  • [Presentation] 海洋生態系データ同化システムを用いた生物化学過程の状態推定2008

    • Author(s)
      石川洋一, 淡路敏之, 岸道郎, 才野敏郎
    • Organizer
      2008年度日本海洋学会春季大会
    • Place of Presentation
      東京海洋大学
    • Year and Date
      2008-03-28
    • Related Report
      2009 Final Research Report 2007 Annual Research Report
  • [Presentation] Assessing the validity of GODAE products in coastal and shelf seas2007

    • Author(s)
      Ishikawa, Y., T. Awaji, T. In, S. Shima, K. Nishina, T. Toyoda
    • Organizer
      GODAE Coastal and Shelf Seas Workshop
    • Place of Presentation
      Liverpool, U. K
    • Year and Date
      2007-10-10
    • Related Report
      2009 Final Research Report
  • [Presentation] Assessing the validity of GODAE products in coastal and shelf seas2007

    • Author(s)
      Ishikawa, Y., T. Awaji, T. In, S. Shima, K. Nishina. T. Tovoda
    • Organizer
      GODAE Coastal and Shelf Seas Workshop
    • Place of Presentation
      Liverpool, U.K.
    • Related Report
      2007 Annual Research Report
  • [Book] データ同化観測・実験とモデルを融合するイノベーション2009

    • Author(s)
      淡路敏之, 蒲地政文, 池田元美, 石川洋一
    • Total Pages
      284
    • Publisher
      京都大学出版会
    • Related Report
      2009 Final Research Report
  • [Book] データ同化 観測・実験とモデルを融合するイノベーション2009

    • Author(s)
      淡路敏之、蒲地政文、池田元美、石川洋一
    • Total Pages
      284
    • Publisher
      京都大学出版会
    • Related Report
      2009 Annual Research Report

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Published: 2007-04-01   Modified: 2016-04-21  

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