| LEI Ruibo,LI Zhijun,LI Na,LU Peng,CHENG Bin. 2012. Crucial physical characteristics of sea ice in the Arctic section of 143°-180°W during August and early September 2008. Acta Oceanologica Sinica, (4):65－75 |
| Crucial physical characteristics of sea ice in the Arctic section of 143°-180°W during August and early September 2008 |
| Crucial physical characteristics of sea ice in the Arctic section of 143°-180°W during August and early September 2008 |
| Received:October 15, 2011 Revised:February 15, 2012 |
| DOI：10.1007/s13131-012-0221-0 |
| Key words:sea ice thickness concentration ice core Arctic Ocean |
| 中文关键词: sea ice thickness concentration ice core Arctic Ocean |
| 基金项目: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. |
| Author Name | Affiliation | E-mail | | LEI Ruibo | Polar Research Institute of China, State Oceanic Administration, Shanghai 200136, China | leiruibo@pric.gov.cn | | LI Zhijun | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China | | | LI Na | Polar Research Institute of China, State Oceanic Administration, Shanghai 200136, China | | | LU Peng | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China | | | CHENG Bin | Finnish Meteorological Institute, P. O. Box 503, Helsinki FI-00101, Finland | |
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| Abstract: |
| 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/m3. Significant ice loss in the investigated Arctic sector during the last 15 a can be identified by comparison with the previous observations. |
| 中文摘要: |
| 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/m3. Significant ice loss in the investigated Arctic sector during the last 15 a can be identified by comparison with the previous observations. |
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