东南极大陆边缘地区夏季近地面层风场特征分析  

CHARACTERISTICS OF THE SURFACE WIND IN SUMMER AT THE CONTINENTAL MARGIN,EAST ANTARCTICA

作　　者：薛峰[1,2] 张占海[2] 周明煜[2] 李诗明[3] 李丙瑞[2] 孙波[2] 

机构地区：[1]国家海洋局第二海洋研究所,杭州310012 [2]中国极地研究中心,上海200136 [3]国家海洋环境预报研究中心,北京100081

出　　处：《极地研究》2009年第4期288-298,共11页Chinese Journal of Polar Research

基　　金：国家自然科学基金(40233032);科技部863项目(2006AA09Z130);科技部支撑项目(2006BAB18B03;006BAB18B05)资助

摘　　要：本文介绍了"2007—2008国际极地年"期间在南极东部大陆边缘伊丽莎白公主地区进行的风场结构观测实验。自动气象站(Automatic Weather Station,AWS)观测数据的统计分析结果表明,夏季该地区冰盖上的近表面风场主要是由下降风控制,而沿海地区的风场则由于海陆热力学性质的差异呈现出冰盖下降风与局地海陆风交互作用的特点。个例研究表明在冰盖下降风占优时段内,伊丽莎白公主地区的近表面风场具有相当规律的日变化特征,太阳入射辐射规律的日变化是这一现象出现的根本原因。多普勒声雷达对风场垂直结构的观测表明,150 m以下的各高度水平风矢量的变化特征与近地面层风场近似一致,冰盖下降风和海陆风旺盛阶段,偏东风和偏西风的高度可达650 m之高。In this paper, the filed experiment aimed at the surface wind field over Princess Elizabeth land during IPY 2007-2008 was briefly introduced. Analysis of the data observed from two automatic weather stations showed that the near surface wind field on the ice sheet was dominated by katabatic wind, while at seaboard a distinct feature is that this area was controlled by katabatic wind and sea and land breeze alternatively. Results from a case-study showed that during the periods of predominately katabatic wind, there exists a clear diurnal change in wind speed and direction at this area, and the regular incoming solar radiation must be the essential factor which attributed to this phenomenon. Beneath the height of 150 meters, vertical structure of the horizontal wind vector observed from Digital Doppler Sodar presented a characteristic almost the same with the near surface one, and the signal of katabatic wind and sea breeze could be to the height of 650 meters during their vigorous periods. higher

关 键 词：自动气象站 多普勒声雷达 下降风 海陆风 东南极 

分 类 号：P425.4[天文地球—大气科学及气象学]