7月份连续性暴雨与南亚高压活动特征分析

The Characteristic Analysis of the Continuity rainstorm and South Asia High Activity in July

利用1958～2000年7月份逐日100hPa平均位势高度场和平均风场的资料与同期降水资料,分析7月份连续性暴雨与南亚高压活动的关系,结果发现二者间存在着密切的关系。首先按降水规律将我国南方划分为两个区:东区,南区。在发生连续性暴雨过程中,当南亚高压中心位于青藏高原上时,东区的暴雨总量增多,当中心位于伊朗高原上空时,暴雨总量有所减少。而南区则正相反,当南亚高压位于伊朗高原附近上空时,南区暴雨总量偏多,位于青藏高原上空时,暴雨总量则偏少。

By using the daily data of 100hPa mean geopotential height field and mean wind field in July from 1958 to 2000 and precipitation data in the corresponding period, through the analysis about correlation between continuity rainstorm and South Asia High pressure （SAH） activity, we found that the correlation is consanguineous. First, according the rule of precipitation, south china has been divided into two zones： eastern zone and southern zone. As the center of SHA was found on Qinghai-Tibet Platean, rainfall of eastern zone was increased; as it was found on Iran Plateaus, rainfall of eastern zone was decreased. It was just the contrary in southern zone.