| Crucial physical characteristics of sea ice in the Arctic section of 143°–180°W during August and early September 2008 |
| |
| 作者姓名： | LEI Ruibo LI Zhijun LI N LU Peng CHENG Bin |
| |
| 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. |
| |
| 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： | sea ice thickness concentration ice core Arctic Ocean |
Crucial physical characteristics of sea ice in the Arctic section of 143°-180°W during August and early September 2008 |
| |
| LEI Ruibo,LI Zhijun,LI N,LU Peng,CHENG Bin.Crucial physical characteristics of sea ice in the Arctic section of 143°-180°W during August and early September 2008[J].Acta Oceanologica Sinica,2012,31(4):65-75. |
| |
| Authors: | LEI Ruibo LI Zhijun LI N LU Peng and CHENG Bin |
| |
| Institution: | Polar Research Institute of China, State Oceanic Administration, Shanghai 200136, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;Polar Research Institute of China, State Oceanic Administration, Shanghai 200136, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;Finnish Meteorological Institute, P.O. Box 503, Helsinki FI-00101, Finland |
| |
| 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. |
| |
| Keywords: | sea ice thickness concentration ice core Arctic Ocean |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |
