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Experimental Studies of Oceanic Heat Flux in a Frozen Sea

Research Project

Project/Area Number 60460046
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 気象・海洋・陸水学
Research InstitutionHokkaido Unicersity

Principal Investigator

ONO Nobuo  Inst of Low Temp.Sci,Hokkaido Univ, 低温科学研究所, 教授 (40001648)

Co-Investigator(Kenkyū-buntansha) TAKIZAWA Takatoshi  Inst of Low Temp. Sci.,Hokkaido Univ., 低温科学研究所, 助手 (00002171)
WAKATSUCHI Masaaki  Inst of Low Temp. Sci.,Hokkaido Univ., 低温科学研究所, 助教授 (60002101)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1987: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1986: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1985: ¥3,700,000 (Direct Cost: ¥3,700,000)
KeywordsFrozen Sea / Sea Ice / Oceanic Hea Flux / Ocean Mixed Layer / Thermal Budget / フラジルアイス / 海水 / 海面水温
Research Abstract

The vertical oceanic heat flux is investigated experimentally as a relation with the surfce conditions of a flozen sea.
Laboratory experiments were carried out to examine the processes of frazil ice formation under a cold wind conditions as a function of air temperature(-10 -30゜c) and wind speed (2-6m/s). A plexiglass test tank of 0.4m x 2.0m x 0.6m was filled with 32 per mill salt water. Frazil ice crystals produced in open water were transported downward by the wind-driven current,and the wind-generated open water was maintained within two hours or more. At a higher wind speed, a significant amoumt of supercoolsd water formed within the interior of the tank,and did not disappear despite rapid frazi ice production.
Field experiments were also carried out to observe the magnitude of heat flux flowed through a thin sea ice cover at lagoon Lake Saroma, Okhotsk Sea coast of Hokkaido, in February of 1986,1987,and 1988. Test pools(2x2m) were made by removing ice blocks from the fast ice sheet with a thickness of about 30 cm. Using sea ice sheet as a heat flow meter the oceanic heat flux was calculated as the difference between vertical heat flux within the sea ice sheet and the latent heat released by freezing at the ice-water interface. It was found that the oceanik heat flux cannot be neglected in the heat budfet of young sea ice because it was as large as compared with the latent heat of newly formed sea ice. when the sea ice was covered with snow the oceanic heat flux decreased,however after removing of the sno the heat flux increased. The effect of snow cover is also investigated as a snow-ice model.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 小野延雄 他: 低温科学物理篇. 45. 37-43 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 牛尾収輝 他: 低温科学物理篇. 46. 163-170 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Tatsuo Motoi,et al: J. of Physical Oceanography. 17. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 小野延雄: 低温科学物理篇. 47. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ono,Nobuo: "Oceanic Heat Flux Through A Young Sea-Ice Sheet" Teion Kagaku. a45. 37-43 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Ushio,Shuki: "Experiments on Rapid Frazil Ice Production in a Wind-generated Open Water." Teoin Kagaku. a46. 163-170 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Motoi,Tatsuo: "A Mechanism For the Formation Of the Weddwll Polynya in 1974" J. Physical Oceanography. 17. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 小野延雄,牛尾収輝: 低温科学物理篇. A45. 37-43 (1986)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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