澳大利亚冷空气活动对西北太平洋热带辐合带强度的影响  

Affection of Cold Air over Australia on Tropical Cyclone over Northwestern Pacific

作　　者：孙即霖[1] 韦冬妮[2] 李永平[3] 

机构地区：[1]中国海洋大学物理海洋实验室海洋-大气相互作用与气候实验室(OAC),山东青岛266100 [2]国家海洋局大连中心站,辽宁大连116015 [3]上海台风研究所,上海200030

出　　处：《中国海洋大学学报（自然科学版）》2009年第5期863-869,共7页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(40676012);上海台风研究所开放课题资助

摘　　要：利用1959～2004年纬向风的NCEP/NCAR候平均再分析资料分析和中国科学院大气物理研究所研制的9层大气环流模式(IAP9L-AGCM)数值试验,考察了南半球越赤道气流和澳大利亚冷空气活动对西北太平洋ITCZ和台风的影响。研究发现:100°E～165°E向北越赤道气流与ITCZ的强度增强具有明显的关系;10～15 d前130°E～140°E与150°E～160°E越赤道气流的加强对145°E～170°E位置上ITCZ强度的增加具有指示意义。越赤道气流强度对同期110°E～140°E经度ITCZ位置的变化也有影响。数值试验表明:南半球澳大利亚冷空气的活动是造成越赤道气流加强的重要原因,澳大利亚地区受较强冷空气影响时易造成100°E～160°E经度带越赤道气流的加强,特别是140°E～165°E的越赤道气流有利于ITCZ强度增加,导致西北太平洋热带气旋的发生和加强。Based on the NCEP/NCAR reanalysis data and using IAP9L-AGCM created and developed by the Institute of Atmospheric Science, statistical analysis and numerical experiment were done to study the relations among the strength of ITCZ and the happening frequency of tropical cyclone and the cross-equator air stream over the South China Sea and the tropical Northwestern Pacific. It was found that the northward cross Equator air stream from 100°E- 165°E have positive relations with the strengthening of ITCZ; The intensification of cross equator stream at 130°E- 140°E and at 150°E- 160°E imply the strengthening of ITCZ along 140°E- 170°E 10 - 15 d afterwards. The intensification of cross air stream also affected the location of ITCZ along 110° E-- 140°E. Numerical experiments show that the active of cold air over Australia can affect the intensification of cross equator stream along 100°E-- 160°E. Streams at 140°E-- 165°E are more affective for the strengthening of ITCZ, resulted to favor the formation of tropical cyclone.

关 键 词：澳大利亚冷高压 越赤道气流强度 影响 热带西太平洋 热带气旋 

分 类 号：P723.9[天文地球—海洋科学]