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南极高原夏季 Ekman 边界层动力学分析

【标题】南极高原夏季 Ekman 边界层动力学分析

【Title】Ekman dynamics of the atmospheric boundary layer over the Antarctic Plateau in summer

【作者】 王继志; 卞林根; 效存德; 柳景峰; 李传金; 逯昌贵; 杨元琴; 傅良

【Author】 Wang Jizhi ; Bian Lingen ; Xiao Cunde ; Liu Jingfeng ; Li Zhuanjin ; Lu Changgui ; Yang Yuanqin ; Fu Liang

【期刊】中国科学

【Journal】SCIENCE CHINA PRESS

【期刊年份】2014

【卷】59

【期】11

【关键词】 南极; 昆仑观测站; Ekman; 边界层; 厚度; 湍流应力

【Keywords】 Antarctica, Kunlun Station, Ekman, boundary layer, thickness, turbulent stress

【摘要】极地大气行星边界层动力过程及其对全球大气环流的影响是大气科学研究关注的重要问题. 利用中国南极昆仑站2012 和2013 年夏季高分辨率的GPS 探空资料, 对南极高原大气边界层的动力特征进行了研究. 结果表明, 南极高原观测风随高度的变化规律与理论计算的Ekman 螺旋曲线基本一致. 风速随高度增加快速、风向左转. 这是在南半球观测到的显著Ekman 垂直结构特征. Ekman 动力边界层的厚度较高, 平均从900 m 向上至3400 m, 900 m 以下为对流混合层. 整个层结呈干冷和稳定状态, 显示了南极高原边界层动力结构具有其独特性. 计算的南极高原湍流摩擦应力明显大于中低纬度地区的值, 表明南极高原行星边界层动力摩擦效应对全球大气环流的影响显著.

【Abstract】The dynamics of the polar atmospheric boundary layer and its impact on the global atmospheric circulation are important issues in earth science research. We used GPS sounding data collected during summer 2012–2013 at Kunlun Station, Antarctica, to analyze dynamic characteristics of the atmospheric boundary layer over the Antarctic Plateau. Results showed that observed changes in wind speed and direction with height in the boundary layer coincided with the theoretical calculation of the Ekman spiral. The wind speed increased rapidly with height and the wind direction moved to the left. The vertical structure was therefore characteristic of the Ekman layer in the Southern Hemisphere. The Ekman boundary layer was high in the atmosphere, from 900 to 3400 m, with a dry, cold, and stable stratification throughout the layer, while the convective mixing layer was below 900 m. Our observations revealed a complex and dynamic structure in the atmospheric boundary layer over the Antarctic Plateau. Ekman equation calculations showed that turbulent friction stress over the Antarctic Plateau is significantly higher than over the lower latitudes. Dynamic friction from the atmospheric boundary layer over the Antarctic Plateau is likely to have important impacts on the global atmospheric circulation.

【基金/项目】 大气污染与气象条件对哮喘人群影响的交互作用研究

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