成都强对流天气形成的水汽输送机制的研究

Study on the Mechanism of Water Vapor Transport in the Formation of Severe Convective Weather in Chengdu

利用地面及高空资料对2004—2011年四川强对流天气汇总、分类并讨论,根据个例天气图、NCEP/NCAR再分析资料中探空资料等对其背景场简要分析,讨论四川“9·3”大暴雨中水汽来源。结果表明:每年强对流天气分布于4—10月,严重强对流天气集中于8—9月;针对个例分析暴雨水汽来源得出异常水汽输送在强对流天气中占比较大,强对流天气下水汽输送主要源于南海、西太平洋和黄海地区,孟加拉湾水汽输送无明显作用。

The severe convective weather in Sichuan Province from 2004 to 2011 is summarized,classified and discussed by using the surface and high-altitude data.The background field is briefly analyzed according to the case weather map and the radiosonde data in NCEP/NCAR reanalysis data,and the source of water vapor in the"9·3"heavy rain in Sichuan Province is discussed.The results show that the annual severe convective weather is from April to October,and the severe severe convective weather is concentrated from August to September.According to the case analysis,the abnormal water vapor transport accounts for a large proportion of the severe convective weather.The water vapor transport in the severe convective weather mainly comes from the South China Sea,the Western Pacific and the Yellow Sea,and the water vapor transport in the bay of Bengal has no obvious effect.