| Project/Area Number |
60460046
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
気象・海洋・陸水学
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| Research Institution | Hokkaido Unicersity |
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Principal Investigator |
ONO Nobuo Inst of Low Temp.Sci,Hokkaido Univ, 低温科学研究所, 教授 (40001648)
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| 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)
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| Project Period (FY) |
1985 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| 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)
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| Keywords | Frozen Sea / Sea Ice / Oceanic Hea Flux / Ocean Mixed Layer / Thermal Budget / フラジルアイス / 海水 / 海面水温 |
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| 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.
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