| 南极威德尔海冬季冰脊形拖曳力 |
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| 引用本文： | 谭冰,卢鹏,李志军,HAAS Christian,NICOLAUS Marcel.南极威德尔海冬季冰脊形拖曳力[J].水科学进展,2012,23(6):869-877. |
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| 作者姓名： | 谭冰 卢鹏 李志军 HAAS Christian NICOLAUS Marcel |
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| 作者单位： | 1. 大连理工大学海岸和近海工程国家重点实验室, 辽宁大连 116024;2. 南阳师范学院数学与统计学院, 河南南阳 473061;3. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton T6G 2E3, Canada;4. Alfred Wegener Institute for Polar and Marine Research, Bremerhaven 24 27570, Germany |
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| 基金项目： | 国家自然科学基金资助项目(40806075;50921001)~~ |
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| 摘 要： | 利用2006年南极威德尔海冬季科学考察期间由机载激光高度计测得的海冰上表面形态数据,以拖曳分割理论为基础研究了冰脊形拖曳力及其对冰-气总拖曳力的贡献以及中性条件下对应10 m高度处风速的冰-气拖曳系数Cdn(10)。结果显示,在密集冰区,冰脊形拖曳力及其对总拖曳力的贡献随冰脊强度(脊高/脊距)的增大呈递增趋势,而随粗糙长度的增大而减小,对应于威德尔海冬季典型冰脊强度和粗糙长度,占总拖曳力的35%,说明了冰脊形拖曳力在冰-气界面动量交换中的重要作用。Cdn(10)随冰脊强度的增大而增大,但冰脊强度较小时,Cdn(10)随粗糙长度增大而增大;而对较大的冰脊强度,Cdn(10)则随粗糙长度增大而减小。
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| 关 键 词： | 南极 冰脊 形拖曳力 拖曳系数 威德尔海 |
| 收稿时间： | 2011-12-28 |
Form drag of ice ridges in winter Weddell Sea,Antarctica |
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| TAN Bing,LU Peng,LI Zhi-jun,HAAS Christian,NICOLAUS Marcel.Form drag of ice ridges in winter Weddell Sea,Antarctica[J].Advances in Water Science,2012,23(6):869-877. |
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| Authors: | TAN Bing LU Peng LI Zhi-jun HAAS Christian NICOLAUS Marcel |
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| Institution: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Mathematics and Statistics, Nanyang Normal College, Nanyang 473061, China;3. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton T6G 2E3, Canada;4. Alfred Wegener Institute for Polar and Marine Research, Bremerhaven 24 27570, Germany |
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| Abstract: | Based on the surface morphology of sea ice in the Weddell Sea measured by a helicopter-borne laser altimeter during the Winter Weddell Outflow Study 2006, form drag on ice ridges and its contribution to total drag, and air-ice drag coefficient Cdn(10) corresponding to 10m altitude under a neutral stability condition are studied using the drag partition theory. The results revealed that, for compacted ice field, form drag on ridges and its contribution to total drag both increase with ridging intensity (the ratio of mean sail height to mean spacing), while decrease with increasing roughness length. And this ratio to the total drag was 35% corresponding to the typical ridging intensity and roughness length in the winter Weddell Sea, indicating an important impact of form drag on ridges to the momentum exchange at the air-ice interface. Besides, there is an increasing trend of the drag coefficient Cdn(10) with increasing ridging intensity. Meanwhile, Cdn(10) increases for the smaller ridging intensities, whereas decreases for the larger ridging intensity, with increasing roughness length, which is mainly attributed to the change of dominance of form drag on pressure ridges and skin drag over rough ice surface. |
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| Keywords: | Antarctica ice ridges form drag drag coefficient Weddell Sea |
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