J4 ›› 2009, Vol. 27 ›› Issue (3): 207-212.

• 论文 • 上一篇    下一篇

2008年云南省秋季连阴雨天气的环流及水汽特征分析

黄慧君1, 2,李庆红1, 2,高月忠1, 2
  

  1. (1.云南省大理州气象局,云南 大理 671000; 2.云南省季风与气象灾害研究实验室,云南 昆明 650032)
  • 收稿日期:2009-06-09 修回日期:2009-08-03 出版日期:2010-09-30 发布日期:2009-09-30
  • 作者简介:黄慧君(1966-),女,云南省鹤庆县人,高级工程师,主要从事天气分析与预报工作.

Characteristics ofC irculation andM oisture Flux During a Continuous Autumn Rain Process in2008in Yunnan Province

HUANGHuijun1, 2, LIQinghong1, 2,GAO Yuezhong1, 2
  

  1. (1. DaliMeteorologicalBureau ofYunnan Province,Dali671000, China;2. Monsoon andMeteorological
    DisasterResearch Laboratory ofYunnan Province, Kunming650032, China)
  • Received:2009-06-09 Revised:2009-08-03 Online:2010-09-30 Published:2009-09-30

摘要:

对云南省2008年10月24~11月6日严重连阴雨天气的环流和水汽特征进行分析。结果表明:本次连阴雨过程是在副热带高压强度较强、位置偏西、槽前西南气流和副高外围西南气流都有利于水汽向云南输送的环流背景下,中低层受槽前西南气流、低空急流和切变线的影响下产生的。在整个连阴雨期间对流层低层都有充足的水汽,连阴雨前期水汽来源于孟加拉湾和南海2个通道的汇合,而连阴雨后期水汽主要来源于南海。整个连阴雨期间云南全省或大部均处于水汽辐合区内,区域性强降雨出现在水汽通量散度<-32×10-7g·(hPa·s)-1·cm-2的区域。

关键词: 连阴雨, 环流特征, 水汽分析

Abstract:

t:The circulation andmoisture flux characteristics atmiddle and lower levels during a continuous autumn rain process from October24 toNovember6 of2008 in Yunnan Provincewere analyzed. Results show thatduring thisweather process the western Pacific SubtropicalHigh at500 hPawentwest and was stronger than average, and the southwest air currents in front of the trough and in the periphery  ofSubtropicalHighwere beneficial towatervapor transportation toYunnan. Its influence systemswere the southwestair current in front of the trough, the low-level jet and shear line atmiddle and lower levels. Therewere plentiful vaporduring the continuous rain process atmiddle and lower levels. During the previous stage of the process themainwatervapor source in lower levelof tropospherewas in South China Sea and Bay ofBenga,l and during the later stage itwas in South China Sea. Thewater vaporwas convergence overYunnan during thewhole process, and the heavy rain occurred in the area ofdivergence ofvapor flux less than -32×10-7g·hPa-1·s-1·cm-2.

Key words: continuous autumn rain, circulation feature, water vapor analysis

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