云南初夏降水与前期大气环流的关系  

A STUDY ON RELATION BETWEEN THE PRECEDING CIRCULATION AND THE RAINFALL IN YUNNAN DURING EARLY SUMMER

作　　者：琚建华[1] 李绚丽[1] 

机构地区：[1]云南大学地球科学系

出　　处：《高原气象》1999年第1期63-70,共8页Plateau Meteorology

基　　金：国家"九.五"重中之重项目云南专题

摘　　要：利用１９７３～１９８７年云南省１２４个站的逐日雨量资料，分析得到云南省初夏５～６月降水偏多的年份为１９７８，１９８１，１９８４和１９８５年，降水偏少的年份为１９７７，１９８２，１９８３和１９８７年。并利用１９７３～１９８７年北半球５００ｈＰａ等压面高度资料以及２００ｈＰａ副热带风场资料，研究了云南省初夏降水与前期大气环流的关系。结果表明，云南初夏降水的多寡在前期５００ｈＰａ高度场和２００ｈＰａ纬向风场上均有较为明显的反映。The influences of the abnormal circulation in preceding winter and spring on the rainfall in Yunnan during early summer have been analyzed. The characteristics of westerly circulation in mid high latitude areas and zonal wind fields in subtropical areas have been analyzed for drought and flood years respectively by using a composite method. The results show that the amount of rainfall in Yunnan during early summer were influenced by abnormal characteristics of geopotential height fields on 500 hPa level over mid high latitude areas and subtropical zonal winds on 200 hPa level in preceding winter and spring.

关 键 词：大气环流 云南 初夏降水 降水 

分 类 号：P457.6[天文地球—大气科学及气象学] P434