热带气象学报2017，Vol.33Issue(1)：11-20,10.DOI:10.16032/j.issn.1004-4965.2017.01.002
影响华南后汛期季风持续性暴雨和热带气旋持续性暴雨的大尺度环流背景分析
COMPARED ANALYSIS CHARACTERISTICS OF IMPACT OF LARGE SCALE CIRCULATION ON THE PERSISTENT HEAVYRAINS IN POST-FLOOD SEASON IN SOUTH CHINA ASSOCIATED WITH MONSOON AND TROPICAL CYCLONE
摘要
Abstract
Based on the NCEP daily and monthly reanalysis data and the daily rainfall records from 743 stations and South China stations in China during 1961-2008,it is found that there exist 74 persistent heavy rainscases in post-flood season in South China,including 54 cases caused by tropical cyclones (TCR) and 20 cases caused by monsoon (MSR).For the TCR mode,it mainly occurred in August,which accounts for about 52 percent of the total numbers of TC persistentheavy rains.For the MSR mode,it mainly happened in July,which account for about 70 percent of the total numbers of monsoon persistentheavy rains.It illustrates obvious interdecadalincreasing variation characteristics since 1980 for both two modes.When the continuous warm surfaces sea temperature anomalies (SSTA) in the Middle and East tropical Pacific happened in the preceding and simultaneous period,the South China Sea summer monsoon circulation canbe strengthened,which resulting in the water vapor abnormal convergence.In addition,the SSTA may lead to the westerly jet positionmore northwardthroughenhancing the convection of the Philippine Sea.Such environmental conditions favor "-,+,-" Meridional wave train anomalies teleconnection pattern for MSR in July.By contrast,TCRinAugust is attributed to the westerly jet more northward position,caused by local cold SST anomalies such as like the kuroshio area SST.Superimposed on the large scale circulation,l 0～20-day intraseasonal oscillation propagation characterized by a northwest-southeast oriented wave train patternis mainly responsible for MSR and TCR.关键词
华南后汛期/持续性暴雨/季风/热带气旋/季节内振荡Key words
post-flood Season in South China/persistent heavy rains/monsoon/tropical cyclone/intraseasonal oscillation分类
天文与地球科学引用本文复制引用
李春晖,吴志伟,蒙伟光,张艳霞,谷德军..影响华南后汛期季风持续性暴雨和热带气旋持续性暴雨的大尺度环流背景分析[J].热带气象学报,2017,33(1):11-20,10.基金项目
973项目(2014CB953901) （2014CB953901）
公益性行业(气象)科研专项(GYHY201106003) （气象）
国家自然科学基金项目(41205069、41375095、41675096、41575043、41505067) （41205069、41375095、41675096、41575043、41505067）
中国气象局关键技术集成与应用(CMAHX20160505)共同资助 （CMAHX20160505）
