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2011 Fiscal Year Final Research Report

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

Research Project

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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
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
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.

  • Research Products

    (14 results)

All 2012 2011 2010 2009

All Journal Article (6 results) (of which Peer Reviewed: 5 results) Presentation (8 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 Pages: 579-594

    • DOI

      DOI:10.1007/s00024-011-0387-y.

    • 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

      DOI:10.5772/30330.

    • Peer Reviewed
  • [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

    • 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

    • DOI

      doi:10.5270/OceanObs09.

  • [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

    • 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

    • Peer Reviewed
  • [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
  • [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
  • [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
  • [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
    • Year and Date
      20100920-23
  • [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
  • [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
  • [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
  • [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

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Published: 2013-07-31   Modified: 2023-06-15  

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