滇西北高原强对流天气客观物理量特征分析  

Analysis of Objective Physical Quantity Characteristics of Strong Convective Weather over Northwestern Yunnan Plateau

作　　者：和卫东 赖云华 苏晓力[2] 

机构地区：[1]云南省丽江市气象局,丽江674100 [2]云南省气象局,昆明650034

出　　处：《气象科技》2014年第1期125-130,共6页Meteorological Science and Technology

基　　金：中国气象局气象关键技术集成与应用项目(CAMGJ2012M40)资助

摘　　要：应用MICAPS客观物理量资料,对丽江市2006—2011年82次强对流天气进行诊断分析。结果表明,强对流天气发生前,水汽大多处于高湿或中等湿度状态,一般暴雨时700hPa比湿大于等于9g/kg,冰雹时大于等于6g/kg,或700hPa相对湿度暴雨时大于等于80%,冰雹时大于等于60%;热力状况大多处于高温、高热、高能和对流不稳定状态,部分在川滇间有明显的能量锋存在,特别是暴雨,一般沙氏指数SI小于等于0℃、K指数大于等于35℃、丽江假相当位温θse大于等于68℃,丽江与西昌或成都间的θse差大于等于10℃;动力条件则大多表现为低层正涡度,高层负涡度的有利配置,部分中高层有明显的冷平流,特别是冰雹时,一般700hPa涡度大于等于0×10-5s-1,300hPa以上任一层涡度小于等于-30×10-5s-1,或700hPa层以上任一层温度平流小于等于-1×10-5℃·s-1。MICAPS obiective physical quantity data are used to analyze 82 strong convective weather causes from 2006 to 2011 in Lijiang. The main results indicate that before strong convection weather occurs water vapor is mostly in the high or moderate humidity state, with thermal conditions mostly in a state of high temperature, high energy, and convective instability. The dynamic conditions are favorable to convective activities, such as negative vorticity at lower levels and positive vorticity at upper levels, and there was obvious cold advection, especially hails at the middle and upper levels.

关 键 词：强对流 过程前 客观物理量 滇西北高原 

分 类 号：P448[天文地球—大气科学及气象学]