南亚高压在中南半岛上空建立过程及其与亚洲南部夏季风建立的关系  

Establishment Process Commencement of the South Asian High over the Indo-China Peninsula and Its Relationship with the Onset of the Asian Summer Monsoon

作　　者：薛旭[1,2] 陈文[1] 

机构地区：[1]中国科学院大气物理研究所季风系统研究中心,北京100019 [2]中国科学院大学,北京100049

出　　处：《大气科学》2015年第4期705-721,共17页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金项目41230527;41025017;中国科学院战略性先导科技专项XDA11010401

摘　　要：利用NCEP(National Centers for Environmental Prediction)/NCAR(National Center for Atmospheric Research)再分析资料,首先讨论了南亚高压在中南半岛上空建立日期的定义标准及其建立过程。结果表明,南亚高压在中南半岛上空建立的日期平均为4月29日;合成的南亚高压建立前后的大气环流和非绝热加热的演变揭示出南亚高压建立始于菲律宾东南洋面上的反气旋环流分裂后,西中心在中南半岛上空建立加强形成南亚高压,该建立过程与中南半岛非绝热加热作用密切相关。在此基础上结合NOAA(National Oceanic and Atmospheric Administration)的对外长波辐射(OLR)资料分析了南亚高压在中南半岛上空的建立与亚洲夏季风建立的关系。结果表明,中南半岛夏季风建立和南亚高压在半岛上空建立几乎同时发生;南亚高压在中南半岛建立几天后,东孟加拉湾夏季风开始建立;南亚高压建立大约20天后,南海和菲律宾夏季风开始建立;大约一个月后,西孟加拉湾、印度半岛和东阿拉伯海的夏季风建立。南亚高压在中南半岛上空的建立可视为亚洲夏季风建立的开始,其对亚洲夏季风爆发有很好的指示意义。Using NCEP/NCAR reanalysis data,the criterion for defining the date of the establishment process of the South Asia high （SAH） over the Indo-China Peninsula （ICP） was analyzed.The results indicate that the average commencement date is April 29th.The process begins with an anticyclonic circulation over the southeast of the Philippine Sea,which breaks into two;the western one moves westward and strengthens over the ICP owing to the diabatic heating over the ICP.Using the OLR provided by NOAA,the onset of the South Asian summer monsoon during the SAH development over the ICP was analyzed.The results show that the South Asian summer monsoon starts to build over the ICP at almost the same time as the establishment of the SAH over the ICP.After a few days of the commencement of the SAH development over the ICP,the summer monsoon over the east of the Bay of Bengal begins to develop.About 20 days later,it starts developing over the South China Sea and the Philippine Sea.Approximately one month later,it begins developing over the west of the Bay of Bengal,the Indian peninsula,and the east of the Arabian Sea.Thus,the establishment of the SAH over the ICP can be regarded as a good indicator of the onset of the South Asian summer.

关 键 词：南亚高压 夏季风 非绝热加热 中南半岛 

分 类 号：P461[天文地球—大气科学及气象学]