Crucial physical characteristics of sea ice in the Arctic section of 143°–180°W during August and early September 2008

查看全文 作　　者：LEI [1]Ruibo;LI [2]Zhijun;LI [1]Na;LU [2]Peng;CHENG [3]Bin

机构地区：[1]Polar Research Institute of China,State Oceanic Administration,Shanghai 200136,China;[2]State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;[3]Finnish Meteorological Institute,P.O.Box 503,Helsinki FI-00101,Finland

出　　处：《Acta Oceanologica Sinica》索引2012年第31卷第4期,共11页

基　　金：The National Natural Science Foundation of China under contract Nos 40930848 and 41106160;the State Oceanic Administration of China under contract No. 2012240;the Norwegian Research Council under contract No. 193592/S30;the China Postdoctoral Science Foundation under contract No. 20100470400 摘　　要：Sea-ice physical characteristics were investigated in the Arctic section of 143°-180°W during August and early September 2008. Ship-based observations show that both the sea-ice thickness and concentration recorded during southward navigation from 30 August to 6 September were remarkably less than those recorded during northward navigation from 3 to 30 August, especially at low latitudes. Accordingly, the marginal ice zone moved from about 74.0°N to about 79.5°N from mid-August to early September. Melt-pond coverage increased with increasing latitude, peaking at 84.4°N, where about 27% of ice was covered by melt ponds. Above this latitude, melt-pond coverage decreased evidently as the ice at high latitudes experienced a relatively short melt season and commenced its growth stage by the end of August. Regional mean ice thickness increased from 0.8 (±0.5) m at 75.0°N to 1.5 (±0.4) m at 85.0°N along the northward navigation while it decreased rapidly to 0.6 (±0.3) m at 78.0°N along the southward navigation. Because of relatively low ice concentration and thin ice in the investigated Arctic sector, both the short-term ice stations and ice camp could only be set up over multiyear sea ice. Observations of ice properties based on ice cores collected at the short-term ice stations and the ice camp show that all investigated floes were essentially isothermal with high temperature and porosity, and low density and salinity. Most ices had salinity below 2 and mean density of 800-860 kg/m^3 . Significant ice loss in the investigated Arctic sector during the last 15 a can be identified by comparison with the previous observations. 关键词：海冰厚度北极地区物理特性低纬度地区航行记录平均密度高纬度地区覆盖面

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Crucial physical characteristics of sea ice in the Arctic section of 143°–180°W during August and early September 2008

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