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投稿时间：2006-06-16 修订日期：2006-09-20
投稿时间：2006-06-16 修订日期：2006-09-20
中文摘要: 研究了西昌发射场特殊地形及地形梯度对其暴雨天气的影响。对比分析表明:2004年6月23日暴雨过程属于低涡切变型暴雨,6月27日暴雨过程属于两高辐合型暴雨。利用MM5V3.7进行了多组地形敏感试验,结果表明:场区北侧山脉对场区降水量影响明显,西昌东侧山脉对西昌降水量影响明显。地形梯度分析表明,西昌地区所处的河谷地形和场区所处喇叭口小地形,有利于中小尺度气压扰动的发生、发展和暴雨的产生,当地形梯度减弱时,降水量相应减弱。
中文关键词: 地形，暴雨，诊断分析，敏感试验
Abstract:The effects of the terrain and terrain gradient on the heavy rain of Xichang are studied.It shows that the heavy rain on June 23,2004 is a southwest vortex-shear pattern, and the heavy rain on June 27,2004 is a two-high-convergence-pattern.With the mesoscale model (MM5V3.7) from PSU/NCAR,the two events are simulated.It is found that the mesoscale mountain has significant influence on the location and intensity of the heavy rain area,and the bell-mouthed area and the riverway area of Xichang are favorable to the occur-rence and development of mesoscale disturbance and heavy rain.
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引用文本：
汪正林,党建涛,2006.特殊地形及地形梯度对西昌发射场暴雨的影响[J].气象,32(12):36-42.
,2006.Effect of Terrain on the Heavy Rain of Xichang, Sichuan Province[J].Meteor Mon,32(12):36-42.
汪正林,党建涛,2006.特殊地形及地形梯度对西昌发射场暴雨的影响[J].气象,32(12):36-42.
,2006.Effect of Terrain on the Heavy Rain of Xichang, Sichuan Province[J].Meteor Mon,32(12):36-42.