摘要
用NCC/CMA资料分析了2008年6月深圳降水异常事件的成因,结果认为:2007年7月—2008年2月赤道西太平洋海表温度异常偏低、2008年前冬今春青藏高原积雪面积偏大是深圳异常降水事件的前期气候背景;2008年6月东亚阻塞高压的异常强大及乌拉尔山长波槽的异常加深发展,促进了经向环流异常增强;偏强的冷空气以阶梯槽的形式频繁入侵华南,为深圳异常降水事件提供了动力条件。副高西段较常年偏南,西伸脊点偏东;强劲的季风潮为深圳地区输送了巨大的水汽和热量;冷暖空气在华南地区的频繁交汇与维持是深圳异常降水事件的主要成因。上述多种因素的异常共同导致了深圳异常降水事件的发生。
The cause of unusual precipitation in Shenzhen in June of 2008 has been analysed by using NCC, CMA data. The results show that the early stage climate background of this unusual precipitation was due to abnormally low sea surface temperature in west Paciifie equator during July 2007-Feb. 2008 and larger scale area of accumulated snow in Qinghui-Tibet Plateau during spring and last winter in 2008. Dynamic condition of this unusual precipitation was provided by abnormally strong east Asic blocking high and unusnal development of Ural long-wave trough during June 2008, the strengthening of latitudal circulation lead to stronger cold air invading south China as stepped trough. West part of subtropic high appeared to be unclined to south frequently and ridge point moved east appeared to be inclined to east and strong monsoon surge could transport huge vapor and heat. Frequent confluence and maintenance of cold and warm airmasses in south China became the main cause of unusual rainfall in Shenshen. All above mentioned factors have caused the Shenshen unusual preapitation event in June of 2008.
出处
《气象科学》
CSCD
北大核心
2010年第2期256-261,共6页
Journal of the Meteorological Sciences
基金
921工程项目基金(2005装司字13号)
国家科技支撑计划(2007bac30b05-4)
关键词
洪涝
大尺度环流
副热带高压
西南季风
The great floods Large scale circulation Subtropic high Southwest monsoon
