【摘要】 本文利用综合指数对夏季南亚高压作了强、弱划分,着重研究了相应前期的平流层30、50百帕月平均环流特点,结果表明:南亚高压(及其南侧热带东风带)异常强(弱)年春季,高纬平流层环流存在明显差异。如:阿留申高压进入极地早(迟),早春高纬纬向风异常弱(强),4月纬向2波振幅异常弱(强)等,实际上说明平流层中、下部环流春季转变早(迟)与夏季南亚高压强(弱)基本对应。文中还简要讨论了变化的可能过程。更多还原

【Abstract】 In this paper the South-Asian high is studied as to its strong/weakpart by using the comprehensive index, with emphasis placed on thefeatures of the monthly mean circulation at 30 and 50hPa in the stra-tosphere during its earlier stage. Results show that significant dif-ferences exist in the high-latitude stratospheric circulation during thespring of the year when the South-Asian high, as well as the tropicaleasterlies to its south, is extremely strong/weak.For example, Aleutianhigh enters the polar region early/late, the latitudinal geostrophic windin high latitudes in early spring is enormously weak/strong, and theamplitude of wave 2 along the latitude in April is anomalously weak/strong.In fact, this suggests that the early/late reversal of the circulation ofspring in the middle and lower stratosphere is in correspondence withthe strong/weak South-Asian high in summer. Besides, the possibleprocesses of the variations is briefly discussed.更多还原