论文部分内容阅读
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。
Based on the sea surface ice topography data measured by airborne laser altimeter during the winter scientific investigation of Weddell Sea, Antarctica in 2006, the ice ridge drag force and its contribution to the total ice-air drag force are studied based on the drag-splitting theory And the ice-gas drag coefficient Cdn (10) corresponding to the wind speed at a height of 10 m under neutral conditions. The results show that the ice ridge drag force and its contribution to the total drag force increase with ice ridge strength (ridge height / ridge pitch) in the intensive ice region, but decrease with increasing ice length, Corresponds to the typical ice ridge strength and roughness length of Weddell Sea, accounting for 35% of the total drag force, indicating the important role of ice ridge drag force in the momentum exchange at the ice-gas interface. Cdn (10) increased with the increase of ice ridge strength, but Cdn (10) increased with increasing ice ridge strength, while Cdn (10) increased with increasing ice ridge strength Rough length increases and decreases.