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Analysis of factors in the freshening trend of the water in the North Pacific through back-tracing using an adjoint model

Research Project

Project/Area Number 21540457
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionJapan, Meteorological Research Institute

Principal Investigator

KAMACHI Masafumi  気象庁気象研究所, 海洋研究部, 部長 (00354548)

Co-Investigator(Kenkyū-buntansha) FUJII Yosuke  気象庁気象研究所, 海洋研究部, 部長 (60343894)
MATSUMOTO Satoshi  気象庁気象研究所, 海洋研究部, 研究官 (00414516)
Co-Investigator(Renkei-kenkyūsha) USUI Norih  気象庁気象研究所, 海洋研究部, 研究官 (50370333)
Research Collaborator 松本 聡  気象庁地球環境, 海洋部
石崎 士郎  気象庁地球環境, 海洋部
杉本 裕之  気象庁地球環境, 海洋部
沢田 謙  気象大学校, 講師
YU Jason  台湾中山大学, 教授
FRANCOIS Xavier le dimet  フランスグルノーブル大学, 教授
MAGDALENA Balmaseda  ヨーロッパ中期予報センター
JIANG Zhu  中国大気物理学研究所, 教授
Project Period (FY) 2009 – 2011
Project Status Completed (Fiscal Year 2011)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2009: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords北太平洋中層水 / 低塩化 / トレンド / アジョイント法 / 逆追跡 / データ同化 / 海洋再解析 / 黒潮続流 / 淡水化 / 長期気候変動 / 随伴逆追跡 / 温暖化 / 黒潮続流域 / 随伴逆探索
Research Abstract

A multi-decadal freshening trend is found in the mid-depth layer in a large part of the North Pacific subtropical gyre through the analysis of synthesis data of an ocean model and observations generated by an ocean data assimilation system. In particular, the trend is large in the Kuroshio-Oyashio mixing area east of Japan. The backward tracing of water mass using an adjoint model indicates that freshened water in the mixing intrudes around 160°E into the subtropical gyre after advected by the Kuroshio, and that it results in the freshening of entire the tropical gyre.

Report

(4 results)
  • 2011 Annual Research Report   Final Research Report ( PDF )
  • 2010 Annual Research Report
  • 2009 Annual Research Report
  • Research Products

    (44 results)

All 2012 2011 2010 2009

All Journal Article (18 results) (of which Peer Reviewed: 13 results) Presentation (25 results) Book (1 results)

  • [Journal Article] Barrier layer and relevant variability of the salinity field in the equatorial Pacific estimated in an ocean reanalysis experiment2012

    • Author(s)
      Y. Fujii, M. Kamachi, S. Matsumoto, S. Ishizaki
    • Journal Title

      Pure Appl. Geophys

      Volume: 169 Issue: 3 Pages: 579-594

    • DOI

      10.1007/s00024-011-0387-y

    • Related Report
      2011 Annual Research Report 2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Assimilating ocean observation data for ENSO monitoring and forecasting2011

    • Author(s)
      Y. Fujii, M. Kamachi, T. Nakaegawa, T. Yasuda, G. Yamanaka, T. toyoda, K. Ando, S. Matsumoto
    • Journal Title

      Climate variability-Some aspects, challenges and prospects

      Pages: 75-98

    • DOI

      10.5772/30330

    • ISBN
      9789533076997
    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Assimilating Ocean Observation data for ENSO monitoring and forecasting2011

    • Author(s)
      Yosuke Fujii, Masafumi Kamachi, Toshiyuki Nakaegawa, Tamaki Yasuda, Goro Yamanaka, Takahiro Toyoda, Kentaro Ando, Satoshi Matsumoto
    • Journal Title

      Climate Variability-Some Aspects, Challenges and Prospects (InTech, Croatia)

      Pages: 75-98

    • Related Report
      2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Strategy and issues to be addressed in the sea-ice assimilation.2011

    • Author(s)
      Masafumi Kamachi
    • Journal Title

      Extended abstract of International workshop on "Development of atmosphere-ocean coupled models towards improvement of long range forecast"

      Pages: 55-57

    • Related Report
      2010 Annual Research Report
  • [Journal Article] Estimation of the equatorial Pacific salinity field using ocean data assimilation system2010

    • Author(s)
      Y. Fujii, S. Matsumoto, M. Kamachi, and S. Ishizaki
    • Journal Title

      Adv. Geosci

      Volume: 18 Pages: 197-212

    • URL

      https://www.worldscientific.com/doi/abs/10.1142/9789812838148_0012

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Utilization of Ocean Reanalysis Data for Climate Variability Analysis of the North Pacific Intermediate Water2010

    • Author(s)
      S. Matsumoto, T. Nakano, Y. Fujii, T. Yasuda, M. Kamachi
    • Journal Title

      Proceedings of the "OceanObs' 09 : Sustained Ocean Observations and Information for Society" Conference(Annex)

      Pages: 306-306

    • Related Report
      2011 Final Research Report
  • [Journal Article] Coupled climate simulation by constraining ocean fields in a coupled model with ocean data.2010

    • Author(s)
      Yosuke Fujii
    • Journal Title

      Advances in Geosciences

      Volume: 18 Pages: 197-212

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Utilization of Ocean Reanalysis Data for Climate Variability Analysis of the North Pacific Intermediate Water2010

    • Author(s)
      Matsumoto, S.
    • Journal Title

      Proceedings of the "OceanObs'09 : Sustained Ocean Observations and Information for Society" Conference (Annex) (印刷中)

      Pages: 1-8

    • Related Report
      2009 Annual Research Report
  • [Journal Article] High-Resolution Global and Basin-Scale Ocean Analyses and Forecasts2009

    • Author(s)
      H. E. Hurlburt, M. Kamachi(4番目), N. Usui(18番目), 他16人
    • Journal Title

      Oceanography

      Volume: 22 Pages: 110-127

    • URL

      http://dx.doi.org/10.5670/oceanog.2009.69

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] Ocean Data Assimilation Systems for GODAE2009

    • Author(s)
      J. A. Cummings, M. Kamachi(5番目), 他9人
    • Journal Title

      Oceanography

      Volume: 22 Pages: 96-109

    • URL

      http://dx.doi.org/10.5670/oceanog.2009.69

    • Related Report
      2011 Final Research Report
    • Peer Reviewed
  • [Journal Article] GODAE System in Operation.2009

    • Author(s)
      Dombrowsky, E.
    • Journal Title

      Oceanography Vol.22

      Pages: 80-95

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Ocean Data Assimilation Systems for GODAE2009

    • Author(s)
      Cummings, J.
    • Journal Title

      Oceanography Vol.22

      Pages: 96-109

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High-Resolution Global and Basin-Scale Ocean Analyses and Forecasts2009

    • Author(s)
      Hurlburt, H.E.
    • Journal Title

      Oceanography Vol.22

      Pages: 110-127

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Validation and Intercomparison Studies Within GODAE.2009

    • Author(s)
      Hernandez, F.
    • Journal Title

      Oceanography Vol.22

      Pages: 128-143

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Observing system evaluations using GODAE systems2009

    • Author(s)
      Oke, P.R.
    • Journal Title

      Oceanography Vol.22

      Pages: 144-153

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Estimation of the equatorial Pacific salinity field using ocean data assimilation system2009

    • Author(s)
      Fujii, Y.
    • Journal Title

      Advances in Geosciences (印刷中)

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 海洋予測、GODAEでの情報の流れ、成果と将来2009

    • Author(s)
      蒲地政文
    • Journal Title

      月刊「海洋」 号外No.53

      Pages: 56-67

    • Related Report
      2009 Annual Research Report
  • [Journal Article] Application of singular vector analysis to the Kuroshio large meander2009

    • Author(s)
      Y.Fujii
    • Journal Title

      5th WMO Data Assimilation Symposium Extended Abstract

      Pages: 1-8

    • Related Report
      2009 Annual Research Report
  • [Presentation] Improved representation of nearshore processes at the southern coast of Japan using a 4DVAR assimilation system2012

    • Author(s)
      N. Usui
    • Organizer
      International Workshop of the Coastal and Shelf Seas Task Team
    • Place of Presentation
      Miami, USA
    • Year and Date
      2012-01-10
    • Related Report
      2011 Final Research Report
  • [Presentation] Improved representation of nearshore processes at the southern coast of Japan using a 4DVAR assimilation system2012

    • Author(s)
      Norihisa Usui, Yosuke Fujii, Kei Sakamoto, Masafumi Kamachi
    • Organizer
      International Workshop of the Coastal and Shelf Seas Task Team
    • Place of Presentation
      Miami, USA(招待講演)
    • Year and Date
      2012-01-10
    • Related Report
      2011 Annual Research Report
  • [Presentation] 気象庁季節予報システムにおけるTAO/TRITONブイ・アルゴフロートのインパクト2011

    • Author(s)
      藤井陽介, 安藤健太郎, 岩尾尊徳, 蒲地政文
    • Organizer
      日本海洋学会2011年度秋季大会
    • Place of Presentation
      九州大学筑紫キャンパス(福岡)
    • Year and Date
      2011-09-29
    • Related Report
      2011 Annual Research Report
  • [Presentation] 気象庁季節予報システムにおけるTAO/TRITONブイ・アルゴフロートのインパクト2011

    • Author(s)
      藤井陽介
    • Organizer
      2011年度日本海洋学会秋季大会
    • Place of Presentation
      福岡県春日市
    • Year and Date
      2011-09-28
    • Related Report
      2011 Final Research Report
  • [Presentation] Ocean Observing System Evaluation for Seasonal/Decadal Prediction2011

    • Author(s)
      Y. Fujii
    • Organizer
      GODAE Ocean View-CLIVAR-GSOP Workshop on Observing System Evaluation and Intercomparisons
    • Place of Presentation
      Santa Cruz, USA
    • Year and Date
      2011-09-28
    • Related Report
      2011 Final Research Report
  • [Presentation] 気象研究所海洋再解析データの紹介2011

    • Author(s)
      杉本裕之, 碓氷典久
    • Organizer
      第15回データ同化夏の学校
    • Place of Presentation
      むつプラザホテル(青森)(招待講演)
    • Year and Date
      2011-08-23
    • Related Report
      2011 Annual Research Report
  • [Presentation] Ocean Observing System Evaluation for Seasonal/Decadal Prediction2011

    • Author(s)
      Yosuke Fujii, Doug Smith, Shuhei Masuda, Magdalena Balmaseda, Kentaro Ando, Masafumi Kamachi
    • Organizer
      Workshop on Observing System Evaluation and Intercomparisons
    • Place of Presentation
      Santa Cruz, USA(招待講演)
    • Year and Date
      2011-06-14
    • Related Report
      2011 Annual Research Report
  • [Presentation] Strategy and issues to be addressed in the sea-ice assimilation.2010

    • Author(s)
      Masafumi Kamachi
    • Organizer
      International workshop on "Development of atmosphere-ocean coupled models towards improvement of long range forecast"
    • Place of Presentation
      気象庁(東京)
    • Year and Date
      2010-12-09
    • Related Report
      2010 Annual Research Report
  • [Presentation] 航式CTDで観測された南太平洋熱帯水とバリアレイヤー2010

    • Author(s)
      藤井陽介
    • Organizer
      2010年度日本海洋学会秋季大会
    • Place of Presentation
      北海道網走市
    • Year and Date
      2010-09-07
    • Related Report
      2011 Final Research Report
  • [Presentation] 曳航式CTDで観測された南太平洋熱帯水とバリアレイヤー2010

    • Author(s)
      藤井陽介
    • Organizer
      日本海洋学会2010年秋季大会
    • Place of Presentation
      東京農業大学生物生産学部(北海道)
    • Year and Date
      2010-09-07
    • Related Report
      2010 Annual Research Report
  • [Presentation] 気象庁現業海洋同化システム2010

    • Author(s)
      藤井陽介
    • Organizer
      第14回データ同化夏の学校
    • Place of Presentation
      むつプラザホテル(青森)
    • Year and Date
      2010-08-24
    • Related Report
      2010 Annual Research Report
  • [Presentation] Ocean Data Assimilation System and Seasonal Foresing2010

    • Author(s)
      Yosuke Fujii
    • Organizer
      台湾国立中山大学特別講義
    • Place of Presentation
      Kaohshiung, Taiwan
    • Year and Date
      2010-06-29
    • Related Report
      2010 Annual Research Report
  • [Presentation] Application of Ocean Data Assimilation. CIMPA UNESCO Thematic School2010

    • Author(s)
      M. Kamachi
    • Organizer
      Data assimilation for Geophysical Fluids
    • Place of Presentation
      Wuhan, China
    • Year and Date
      2010-05-04
    • Related Report
      2011 Final Research Report
  • [Presentation] Application of Ocean Data Assimilation.2010

    • Author(s)
      Masafumi Kamachi
    • Organizer
      CIMPA UNESCO Thematic School. Data assimilation for Geophysical Fluids.
    • Place of Presentation
      Wuhan, China
    • Year and Date
      2010-05-04
    • Related Report
      2010 Annual Research Report
  • [Presentation] Coupled Ocean and Atmosphere Analysis by Assimilating Ocean Observation Data to a Coupled Model2010

    • Author(s)
      Y. Fujii
    • Organizer
      Workshop on Decadal Variability, Predictability, and Prediction, and to have research presentations
    • Place of Presentation
      Boulder, USA
    • Related Report
      2011 Final Research Report
  • [Presentation] Coupled Ocean and Atmosphere Analysis by Assimilating Ocean Observation Data to a Coupled Model.2010

    • Author(s)
      Yosuke Fujii
    • Organizer
      Workshop on Decadal Variability, Predictability, and Prediction, and to have research presentations
    • Place of Presentation
      Boulder, USA
    • Related Report
      2010 Annual Research Report
  • [Presentation] データ同化による海洋情報の統合化2009

    • Author(s)
      蒲地政文
    • Organizer
      日本海洋政策研究会第1回年次総会
    • Place of Presentation
      東京大学小柴ホール(東京都)
    • Year and Date
      2009-12-06
    • Related Report
      2009 Annual Research Report
  • [Presentation] Application of singular vector analysis to the Kuroshio large meander.2009

    • Author(s)
      Fujii, Y.
    • Organizer
      5th WMO Data Assimilation Symposium
    • Place of Presentation
      Melbourne, Australia.
    • Year and Date
      2009-10-06
    • Related Report
      2009 Annual Research Report
  • [Presentation] Utilization of ocean reanalysis data for climate variability analysis of the North Pacific Intermediate Water.2009

    • Author(s)
      Matsumoto, S.
    • Organizer
      OceanObs'09
    • Place of Presentation
      Venice, Italy
    • Year and Date
      2009-09-24
    • Related Report
      2009 Annual Research Report
  • [Presentation] Initialization for Seasonal and Decadal Forecasts2009

    • Author(s)
      Balmaseda, M.
    • Organizer
      OceanObs'09
    • Place of Presentation
      Venice, Italy
    • Year and Date
      2009-09-23
    • Related Report
      2009 Annual Research Report
  • [Presentation] Ocean Observing System Evaluation2009

    • Author(s)
      Oke, P.R.
    • Organizer
      OceanObs'09
    • Place of Presentation
      Venice, Italy
    • Year and Date
      2009-09-23
    • Related Report
      2009 Annual Research Report
  • [Presentation] 海洋大循環モデルアジョイントコードのデータ同化への活用2009

    • Author(s)
      藤井陽介
    • Organizer
      第58回理論応用力学講演会
    • Place of Presentation
      東京都
    • Year and Date
      2009-06-09
    • Related Report
      2011 Final Research Report
  • [Presentation] 海洋大循環モデルアジョイントコードのデータ同化への活用2009

    • Author(s)
      藤井陽介
    • Organizer
      第58回理論応用力学講演会
    • Place of Presentation
      東京
    • Year and Date
      2009-06-09
    • Related Report
      2009 Annual Research Report
  • [Presentation] 海洋再解析データを用いた北太平洋中層における長期変化の解析2009

    • Author(s)
      松本聡
    • Organizer
      2009年度日本海洋学会春季大会
    • Place of Presentation
      東京都
    • Year and Date
      2009-04-06
    • Related Report
      2011 Final Research Report
  • [Presentation] 海洋再解析データを用いた北太平洋中層における長期変化の解析2009

    • Author(s)
      松本聡
    • Organizer
      2009年度日本海洋学会春季大会
    • Place of Presentation
      東京
    • Year and Date
      2009-04-06
    • Related Report
      2009 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)
      蒲地政文(編集及び分担執筆)
    • Total Pages
      284
    • Publisher
      京都大学学術出版会
    • Related Report
      2009 Annual Research Report

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Published: 2009-04-01   Modified: 2023-06-15  

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