孟加拉湾深对流加热对东亚季风环流系统的影响  

EFFECT OF BOB DEEP CONVECTION HEATING ON EAST ASIAN MONSOON CIRCULATION

作　　者：周兵 吴国雄[2] 梁潇云 

机构地区：[1]国家气象中心预报系统实验室,北京100081 [2]中国科学院大气物理研究所LASG,北京100029 [3]国家气候中心气候预测与诊断室,北京100081

出　　处：《气象学报》2006年第1期48-56,共9页Acta Meteorologica Sinica

基　　金：国家自然科学基金项目(40275014);国防科技重点实验室基金试点项目(51486040204QT3601);国家科技攻关奥运气象保障项目(2002BA904B05)

摘　　要：利用40年逐日NCEP/NCAR再分析资料、ReynoldsSST资料和R42L9GOALS模式,研究孟加拉湾深对流加热对东亚副热带季风环流系统的影响及其与ENSO的关系。结果表明:孟加拉湾东岸季风于26候开始爆发,其深对流加热的旋转经验正交函数(REOF)分析表明,其激发的东传Rossby波在中高纬度地区具有相当正压结构。数值试验证实孟加拉湾降水增多,其东侧南海到长江以南区域降水明显减少。分析发现季风环流强度指数极小值和Walker环流强度指数极大值的出现对SSTA转折均具超前性,因此,季风环流的变化对预报ElNino减弱或LaNina结束及SSTA变化趋势具有一定的指示意义。In terms of NCEP/NCAR daily reanalysis data sets, outgoing long-wave radiation （OLR） data, Reynold SST data and the R42L9 GOALS model, The effect of Bay of Bengal （BOB） deep convection heating with East Asian monsoon circulation and the relationship with ENSO were analyzed. Results show that east coast of BOB is the earliest onset region of Asian summer monsoon in the 26th pentad, the deep convection activity may be possible key tache between South Asian monsoon and East Asian monsoon. REOF of BOB heating depicts that the excitated Rossby wave transmits eastward along with mid-high latitude, conducing the increase of anti-cyclone circulation over East Asian subtropical region. Numerical experiments validate that the precipitation should be decreased between South China sea and low-middle reaches of Yangtze river while the BOB deep convection heating decreasing. Monsoon circulation index and Walker circulation index have good relationship with El Nino weaken and La Nina ended in respectively.

关 键 词：孟加拉湾 深对流加热 东亚季风环流. 

分 类 号：P444[天文地球—大气科学及气象学] P425.42