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投稿时间：2006-05-26 修订日期：2006-10-13
投稿时间：2006-05-26 修订日期：2006-10-13
中文摘要: 2005年是江淮流域入梅偏晚年。利用NCEP/NCAR再分析资料、OLR资料和江苏省气象台提供的2005年逐日降水资料,对2005年江淮流域入梅前的异常环流形势进行分析,探讨了西太平洋副热带高压和低层中高纬冷空气的活动异常与东亚大槽、中西太平洋ITCZ以及东亚副热带高空西风急流等活动异常的关系。结果表明,入梅前,东亚太槽发展强盛,ITCZ偏弱以及东亚副热带高空西风急流强劲少动导致西太平洋副热带高压北抬偏晚。同时,东亚副热带高空西风急流的强劲少动也使南下冷空气势力强劲,中低层副热带锋区偏南,抑制了暖湿的东亚
中文关键词: 晚梅，副热带高压，东亚夏季风，西风急流
Abstract:The onset of Meiyu over the Changjiang and Huaihe River Basins in 2005 is late. Based on NCEP/NCAR reanalysis data,OLR data and daily precipitation data in 2005,the anomalous circulation conditions are analyzed.The abnormal activities of East Asia major deep trough,mid-west Pacific ITCZ and East Asian subtropical upper westerly jet,and their relationship with the anomalous subtropical high and cold air are discussed.The results show that the late northward-jumping of the subtropical high is caused by the exceptional deep trough of East Asia,the East Asian subtropical upper westerly jet and the weak ITCZ. Additionally,the cold wave is strengthened by the strong upper westerly jet and the subtrop-ical frontal zone is to the south of its normal location.The propagation of warm and wet summer monsoon towards the Changjiang-Huaihe River Valley is prevented by the strong cold air forcing.The late northward-shift of upper westerly jet and the subtropical high is the main reason for the late onset of Meiyu in 2005.
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基金项目:上海市气象局“副热带季风研究及预报技术开发”课题资助
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引用文本：
汪靖,刘宣飞,韩桂荣,何金海,2006.2005年江淮流域入梅偏晚的成因分析[J].气象,32(12):76-81.
,2006.Causality Analysis of Late Meiyu over the Changjiang and Huaihe River Basins in 2005[J].Meteor Mon,32(12):76-81.
汪靖,刘宣飞,韩桂荣,何金海,2006.2005年江淮流域入梅偏晚的成因分析[J].气象,32(12):76-81.
,2006.Causality Analysis of Late Meiyu over the Changjiang and Huaihe River Basins in 2005[J].Meteor Mon,32(12):76-81.