东南印度洋海洋锋面处低空大气的垂向分布结构

本文利用中国第25次南极科学考察期间获取的现场观测数据研究了东南印度洋（弗里曼特尔至中山站间）海洋锋面附近的低空大气风场以及温度场垂向分布特征。结果表明：弗里曼特尔港至中山站之间的亚南极锋锋面暖水侧与冷水侧风速垂向分布结构不同，锋面暖水侧风速垂向梯度小，风速梯度最大值出现在500m高度附近，而锋面冷水侧低空风速梯度最大值出现在150m高度附近，揭示了中纬度海气相互作用机制在东南印度洋海洋锋面附近起重要作用。同时，本文还发现了亚南极锋锋面上空存在支一强的低空纬向急流，急流中心位于300m高度处；极锋上空低空风速强而高空风速弱。

VERTICAL STRUCTURE OF THE LOW LEVEL ATMOSPHERE AROUND THE SOUTHEAST INDIAN OCEAN FRONTS

New GPS radiosonde system was launched to detect the vertical structure of the atmosphere around the southeast Indian Ocean fronts region during the 25th Chinese Antarctic expedition. The detailed information regarding vertical profile of wind speed and air temperature above fronts between Chinese Zhongshan Station and Frementle port was described for the first time. The research reveals that the distinct vertical structure appeared at the warm/cold side of subantarctic front between Chinese Zhongshan Station and Frementle port, the low level wind speed of warm side was stronger than the cold one, which confirmed the special atmosphere-ocean interaction at the front area in the southeast Indian Ocean region. A low-level jet was observed above the subantarctic front between Chinese Zhongshan Station and Frementle port. Vertical structure of the atmosphere around the Antarctic front is quite different compared with the subantarctic front.