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中文摘要：
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，和中性条件下对应10m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。
英文摘要：
Based on the surface morphology of sea ice in the Weddell Sea measured by a helicopter-borne laser altim- eter 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 lOm 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 to- tal drag both increase with ridging intensity （the ratio of mean sail height to mean spacing） , while decrease with in- creasing 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 Can （10） with increasing ridging intensity. Meanwhile, Can（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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