不同年代际背景下1963年和1996年华北盛夏降水及其原因的对比分析

The Summer Precipitation in North China of Different Interdecadal Background Between in 1963 and in 1996 and the Contrastive Analysis of the Cause

为了揭示不同年代际背景下1963年和1996年华北盛夏降水的不同特点及其成因,利用ECWMF逐月再分析资料和中国160站逐月降水等资料,采用合成分析、统计t检验等方法,重点从大气环流和大尺度降水条件方面对比分析1963年和1996年华北盛夏降水产生原因的不同。主要结论如下:1963年华北盛夏降水要多于1996年华北盛夏降水;1963年华北盛夏降水为季风降水,而1996年华北盛夏降水为系统降水;影响1963年华北盛夏降水的中国东部地区500hPa位势高度场的距平分布为"北高南低"型,而影响1996年华北盛夏降水的中国东部500hPa位势高度场的距平分布为"西高东低"型。

Based on the ECWMF monthly reanalysis data and the precipitation data obtained from 160 stations in China, the different characteristics and the causes of the summer precipitation in the North China between in 1963 and 1996 are analyzed by using synthetic analysis and Statistical t-test. This paper analyses and contrasts the causes of the summer precipitation in the North China of 1963 and 1996 from atmospheric circulation to different large-scale precipitation conditions. The results can be generalized as follows： the North China summer precipitation in 1963 was more than in 1996. The North China summer precipitation in 1963 was a monsoon rainfall and was a system rainfall in 1996. In 1963, the anomalies distribution characteristics of the eastern China 500hPa geopotential height was ＂northern high and southern low＂, but was ＂western high and eastern low＂ in 1996.