大气科学2013，Vol.37Issue(4)：801-814,14.DOI:10.3878/j.issn.1006-9895.2012.12033
长江中下游地区冬季极端降水事件与天气尺度瞬变波活动的可能联系
Relationship of Synoptic-Scale Transient Eddies and Extreme Winter Precipitation Events in the Middle and Lower Reaches of the Yangtze River
摘要
Abstract
The association of extreme winter precipitation events in the middle and lower reaches of the Yangtze River including synoptic-scale transient eddies is examined by using the ERA40 and National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) daily reanalysis data and daily rainfall data reported by 85 stations.A close relationship is detected between extreme precipitation events and transient eddies.In winter,two branches of synoptic-scale transient eddies are accompanied by subtropical and polar-front jets,respectively.It is demonstrated that the south branch of the transient eddies differs during highly and less frequent years of extreme precipitation events.Overall,transient eddies become active and strong,and they spread continuously with long durations over Eurasia during highly frequent extreme precipitation years; the reverse occurs for less frequent years.To some extent,the intensity and energy of the transient eddies both experience similar variations from the daily frequency of extreme precipitation.Moreover,the northern branch of the transient eddies and their water vapor transport are favorable for the occurrence of extreme precipitation events.Therefore,extreme winter precipitation events have a close relationship with the synoptic-scale transient eddy,implying the activity and propagation of transient eddies may be important factors in extreme precipitation events.This study is expected to provide a new perspective for the causes of extreme precipitation.关键词
极端降水/瞬变波/天气尺度/长江中下游Key words
Extreme precipitation/ Transient eddies/ Synoptic scale/ Middle and lower reaches of the Yangtze River分类
天文与地球科学引用本文复制引用
陈海山,朱月佳,刘蕾..长江中下游地区冬季极端降水事件与天气尺度瞬变波活动的可能联系[J].大气科学,2013,37(4):801-814,14.基金项目
国家科技支撑计划课题2007BAC29B03,江苏省"333高层次人才培养工程"、"青蓝工程"和江苏高校优势学科建设工程资助项目PAPD （）
