特殊地形及地形梯度对西昌发射场暴雨的影响  

Effect of Terrain on the Heavy Rain of Xichang, Sichuan Province

作　　者：汪正林[1] 党建涛[2] 

机构地区：[1]北京大学物理学院大气科学系,北京100871 [2]西昌卫星发射中心气象室

出　　处：《气象》2006年第12期36-42,共7页Meteorological Monthly

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。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 occurrence and development of mesoscale disturbance and heavy rain.

关 键 词：地形 暴雨 诊断分析 敏感试验 

分 类 号：P458.121.1[天文地球—大气科学及气象学]