夏季青藏高原东部降水变化与副热带高压带活动的研究  

ON THE RELATIONSHIP BETWEEN THE EASTERN TIBET PLATEAU RAINFALL AND SUBTROPICAL HIGH SHIFT IN SUMMER

作　　者：巩远发[1] 许美玲[2] 何金海[1] 陈隆勋[3] 

机构地区：[1]南京信息工程大学 [2]云南省气象台,昆明650034 [3]中国气象科学研究院,北京100081

出　　处：《气象学报》2006年第1期90-99,共10页Acta Meteorologica Sinica

基　　金：国家自然科学基金(40275029);国家重点基础研究发展规划项目(2004CB418302);中国科学院东亚区域气候环境重点实验室开放课题。

摘　　要：用青藏高原上常规的台站资料和NCEP/NCAR的再分析资料,分析和研究了1993/1994年夏季5—8月青藏高原东部降水变化与西太平洋副热带高压南北移动的关系。结果表明:1993年夏季的副热带高压异常偏南,5—8月副高脊线北移过程中,还伴有准双周南北移动过程;而1994年夏季的副热带高压异常偏北,5—8月副高脊线北移过程中,则主要伴有30—60d的低频变化的南北移动过程。同时,在分析青藏高原上的天气变化特征时,发现这两年高原东部的降水变化特征也有明显的不同,夏季高原上降水的活跃和中断与副高脊线南北移动变化有类似的特征。因此,夏季西太平洋副热带高压南北移动可能与高原东部降水的中断/活跃有一定的关系。Based on the routine rainfall data on Tihet plateau and NCEP/NCAR reanalysis data, it is studied by the relationship between the Eastern Tibet plateau rainfall and the southward/northward shift of western pacific subtropical high in summer of 1993/1994. The results show that： the western Pacific subtropical high is abnor- mally located to more southern latitude and the high ridge is mainly the quai-biweekly southward!northward os- cillation in its processes of northward shift from May to August in 1993; but it is abnormally located to more northern latitude and the high ridge is obviously 30--60 day southward/northward oscillation in its processes of northward shift from May to August in 1994. At the same time, it is found that the changes of the Eastern Ti- bet plateau rainfall active/break have the similarity characteristics of the high ridge southward/northward oscillation. Therefore,. t, he southward/northward shift of the western Pacific subtropical high in summer maybe related to the changes of Eastern Tibet plateau rainfall active/break.

关 键 词：副热带高压 小波变换 青藏高原 降水的活跃/中断 

分 类 号：P467[天文地球—大气科学及气象学] S714.7[农业科学—林学]