东亚冬、夏季风强度指数及其与陕西降水变化的关系

East-Asian Winter/Summer Monsoon Intensity Indexes and Their Relationship with Precipitation in Shaanxi Province

使用最新的海平面气压资料计算了东亚冬、夏季风强度指数,分析了近50a东亚季风的变化特征,以及东亚季风强度与陕西省降水的同期和非同期相关关系,结果表明:强的东亚冬季风,易造成陕西省冬季降水偏少,强的东亚夏季风,易造成陕西省夏季北部多雨、南部少雨的气候特征,反之亦然。此外,比较了强弱东亚冬季风年北半球500hPa高度场距平特征差异,从大气环流方面分析了东亚季风影响陕西省气候变化的原因。

In terms of the East-Asian summer/winter monsoon indexs based on the updated sea level pressure(SLP) data,the relationships between the monsoon and indexes the precipitation in Shaanxi Province in the past 50 years are investigated.The results show that:the strong East-Asian winter monsoon means less rain in Shaanxi,while the strong East-Asian summer monsoon means plenty rainfall in the north,and less rainfall in the south of Shaanxi,and vice versa.Additionally,comparison of the Northern Hemispheric 500 hPa atmospheric circulations between strong and weak winter monsoon years,reveals the atmospheric circulation feature that results in the climate changes in Shaanxi Province.