热带气象学报2017，Vol.33Issue(4)：548-557,10.DOI:10.16032/j.issn.1004-4965.2017.04.012
江南地区持续性暴雨过程的月内环流异常和形成机制分析
AN ANALYSIS ON GLOBAL CIRCULATION ANOMALIES AND FORMING MECHANISM IN THE PRECEDING MONTH OF PERSISTENT HEAVY RAINFALL EVENTS OVER THE SOUTH OF YANGTZE RIVER VALLEY
摘要
Abstract
Based on the NCEP/NCAR reanalysis data for 1951-2009,significant global circulation anomalies leading up to persistent heavy rainfall (PHR) events over the South of Yangtze River valley (with 1-month lag) are investigated,and the mechanism that brought about the events are analyzed.The results show that during 3-1 weeks ahead of the PHR events,circulation anomalies are generally located in the Eurasia,the North Pacific Ocean and the South Indian Ocean,and the anomalies in the Eurasia and the South Indian Ocean are two Rossby wave like chains in the subtropical westerlies of the middle and upper troposphere.The dispersion and disappearance of these circulation anomalies made the major circulation of WPSH,the Okhotsk Blocking High and the Meiyu Trough the condition of a phase-lock,therefore causing the formation of circulation characteristics favoring the PHR events.关键词
持续性暴雨过程/江南地区/月内环流异常/影响机制Key words
persistent heavy rainfall events/South of the Yangtze River valley/circulation anomalies in the preceding month/mechanism analyses分类
天文与地球科学引用本文复制引用
赵璐,汤燕冰,高坤..江南地区持续性暴雨过程的月内环流异常和形成机制分析[J].热带气象学报,2017,33(4):548-557,10.基金项目
国家自然科学基金项目(41075033)资助 （41075033）
