南半球环流与西太平洋副热带高压和台风群中期活动的关系

THE RELATIONSHIP BETWEEN GENERAL CIRCULATION OF THE SOUTHERN HEMISPHERE AND THE MEDIUM RANGE ACTIVITIES OF WEST PACIFIC SUBTROPICAL HIGH AND TYPHOON GROUP

通过对南北半球环流６年资料的分析，发现在北半球夏季５～８月，南半球中纬西风指数、低纬西风指数、赤道气压指标与北半球西太平洋副热带高压和台风群的中期活动均有较好的关系．在台风群活跃的年份，台风群生成阶段前后，环流变化由南半球中纬先开始，随后南半球低纬和赤道地区环流也出现变化，赤道气压指标到达低值，此后，北半球西太平洋副热带高压的特征产生一系列的变化，上述南北半球环流系统变化的传播过程为准二周周期．

It is found that the close relationships are present between westerly index in middle and low latitudes of the Southern Hemisphere, pressure index of equator and the medium range activities of West Pacific subtropical high and typhoon group in summer(from May to August) of the Northern Hemisphere by analyzing the data of general circulation of the Southern and Northern Hemispheres for six years. In the active years of typhoon group the variation of general circulation begins at middle latitudes of the Southern Hemisphere, and then at low latitudes of the Southern Hemisphere and equator, the pressure index of equator reaches low value. After that, a series of variations of West Pacific subtropical high over the Northern Hemisphere would appear. The transportation period of the variations mentioned above would be quasi two weeks.