东南极普里兹湾1990年1—2月大风过程与气旋和锋面活动分析

本文用澳大利亚墨尔本气象中心,苏联南极青年站地面天气图和NOAA-10,NOAA-11极轨卫星云图确定了东南极普里兹湾及其附近海域1990年1—2月份气旋中心位置;讨论了这些气旋的活动特征。分析了实测大风对应的天气系统,天气形势和卫星云图特征,指出普里兹湾沿海存在气旋、锋面以及锋面云和气旋先后相继的影响。锋面及锋面、气旋先后相继影响与500hPa上的强高压脊天气形势、强风与锋面带中纹理非常不均匀区域有密切关系。

ANALYSIS OF STRONG WIND PROCESSES AND ACTION OF CYCLONES AND FRONTS DURING JANUARY-FEBRUARY, 1990, OVER PRYDZ BAY, EASTERN ANTARCTICA

Based on the surface weather charts of Meteorological Center,Melbourne, Australia and Antarctic Meteorological Center, Molodeznaya station, Antarctica, and satellite cloud pictures of NOAA 10 and NOAA 11, the center location of cyclones were determined during January to February, 1990 over Prydz Bay, Eastern Antarctica and Neighbouring Area, the active characteristics of these cyclones were discussed, the synoptic systems, synoptic situations and satellite pictures which correspond with strong wind were analysed. It is pointed out that: 1.26 cyclones activated over Prydz Bay from 6 Jan. to 28 Feb. 1990, almost one cyclone every other day. 2. Amount of cyclones and average speed of cyclones in January is more than that in February North of 60°S. 3. There were cyclones over Prydz Bay which can produce strong wind. Fronts and frontal cyclones were present in this area, they can also produce strong wind and heavy snow. Fronts moving southward haved a closed relations with high pressure ridge over 70°E and strong wind is inrretelated with cell cloud area of frontal cloud zone in satellite pictures.