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The role of double diffusive convection on the mixing processes in the ocean

Research Project

Project/Area Number 14540405
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionTokyo University of Marine Science and Technology

Principal Investigator

YOSHIDA Jiro  Tokyo University of Marine Science and Technology, Faculty of Marine Sciences, Professor, 海洋科学部, 教授 (30174931)

Co-Investigator(Kenkyū-buntansha) KITADE Yujiro  Tokyo University of Marine Science and Technology, Faculty of Marine Sciences, Professor, 海洋科学部, 助教授 (50281001)
NAGASHIMA Hideki  Tokyo University of Marine Science and Technology, Faculty of Marine Sciences, Professor, 海洋科学部, 教授 (10087570)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsWOCE Data Set / Density Ratio / Double Diffusive Convection / Salt Finger / Diffusive Convection / North Pacific Intermediate Water / Lateral Diffusion / Cabbeling / Salt Finger / Diffsuive型対流 / ソルトフィンガー / 東亜熱帯モード水 / XCTD / 暖水塊
Research Abstract

The activity of double diffusive convection was investigated through the global density ratio distribution using the WOCE data set. In total, about 43% of the oceanic layers are favorable for the onset of double diffusive convectin, suggesting the important role on the global ocean circulation and the water mass modification processes. Our results are compared with those obtained from the Levitus climatological data set, and was coincided with the basin scale distribution. However, as for the sharp oceanic frontal area which are usually smoothed out from the Levitus data set, our results showed the possibility of high activity of double diffusive convection.
Neutral surface analysis and turbulent mixing analysis were applied for the Oyashio region to the Kuroshio Extension, which reveals the important role of cabbeling and salt finger convection to the modification process of the Northa Pacific Intermediate Water(NPIW). It is concluded that the Oyashio winter mixed layer water (26.65σθ) contributes to the freshening of the lighter layer than the salinity minimum of the NPIW (26.80σθ) and could not become the salinity minimum of the NPIW by the cabbeling and the double diffusive convection.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Yoshida, J.: "The activity of double diffusive convection investigated through the density ratio distribution in the Mixed Water Region (MWR) off Joban-Kashima and Sanriku Coast to the north-east of Honshu, Janan."La mer. 41(1). 52-59 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Inoue R., J.Yoshida, Y.Hiroe, K.Komatsu, K.Kawasaki, I.Yasuda: "Modification of North Pacific Intermediate Water around Mixed Water Region."J.Oceanography. 59. 211-224 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshida, J., H.Nagashima: "Numerical experiments on salt finger convection."Progress in Oceanography. 56(3). 435-459 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshida, J., H.Nagashima: "Numerical experiments on double diffusive intrusion in the ocean and their relation to laboratory experiments."Progress in Oceanography. 56(3). 549-557 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshida, J.: "The activity of double diffusive convection investingated through the density ratio distribution in the Mix ed Water Region (MWR) off Joban-Kashima and Sanriku Coast to the north-east of Honshu, Japan."La mer. 41(1). 52-59 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Inoue, R., J.Yoshida, Y.Hiroe, K.Komatsu, K.Kawasaki, I.Yasuda: "Modification of North Pacific Intermediate Water around Mixed Water Region."J.Oceanography. 59(2). 211-224 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshida, J., H.Nagashima: "Numerical experiments on salt finger convection."Progress in Oceanography. 56(3). 435-459 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshida, J., H.Nagashima: "Numerical experiments on double diffusive intrusion in the ocean and their relation to laboratory experiments"Progress in Oceanography. 56(3). 549-557 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshida, J.: "The activity of double diffusive convection investigated through the density ratio distribution in the Mixed Water Region (MWR) off Joban-Kashima and Sanriku Coast to the north-east of Honshu, Japan."La mer. 41(1). 52-59 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Inoue, R., J.Yoshida, Y.Hiroe, K.Komatsu, K.Kawasaki, I.Yasuda: "Modification of North Pacific Intermediate Water around Mixed Water Region."J.Oceanography. 59. 211-224 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yoshida, J., H.Nagashima: "Numerical experiments on salt finger convection."Progress in Oceanography. 56(3). 435-459 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yoshida, J., H.Nagashima: "Numerical experiments on double diffusive intrusion in the ocean and their relation to laboratory experiments."Progress in Oceanography. 56(3). 549-557 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 北出裕二郎: "小さな矩形海における内部静振のエネルギー散逸過程"海の研究. 11(2). 259-270 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] J.Yoshida: "Numerical experiments on salt finger convection"Progress in Oceanography. (印刷中).

    • Related Report
      2002 Annual Research Report
  • [Publications] J.Yoshida: "Laboratory and numerical experiments on double diffusive intrusion in the ocean"Progress in Oceanography. (印刷中).

    • Related Report
      2002 Annual Research Report
  • [Publications] Ryuichiro Inoue: "Modification of North Pacific Intermediate Water around xed Water Region"Journal of Oceanography. (印刷中).

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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