非地转湿Q矢量在云南冬季强降水中的分析应用  

Non-geostrophic Wet Q-vector Analysis and Application of Heavy Precipitation in Winter in Yunnan

作　　者：郭荣芬[1] 李英[2] 杨向东[1] 周翠芳 

机构地区：[1]云南省气象台,昆明650034 [2]中国气象科学研究院 [3]宁夏石嘴山市气象局

出　　处：《气象》2005年第2期12-16,共5页Meteorological Monthly

基　　金：云南省"十五"科技攻关 2 0 0 1GN4 3项目资助

摘　　要：应用非地转湿 Q矢量理论对 2 0 0 3年 1月 5～ 6日云南冬季的一次强降水过程进行诊断分析 ,结果表明 :50 0hPa青藏高原横切变、快速东移的南支槽、低层 70 0hPa西南急流、地面强冷锋是此次云南冬季强降水的主要影响系统 ;非地转湿 Q矢量流场的辐合中心 (辐合线 )与强降水区吻合 ;近地面 80 0hPa锋生函数场正值区的变化较好地反映了锋面的强度 ,锋生函数正值区范围与降雪区域对应较好 ;70 0hPa非地转湿 Q矢量散度场辐合区与云南冬季强降水的产生及强度正相关。A diagnosis of a heavy rainfall from Jan.5 to Jan.6,2003 is made with the Non geostrophic Wet Q vector( Q ) theory. The results show that the transverse shear line over the Qingzang Plateau and the trough eastward at the 500hPa, southwesterly jet at the 700hPa, and heavy cold front on the surface are the important influencing systems. The region of heavy rainfall has a good relation with Q  divergence center or line. The changes of Q  frontogenesis function at the 800hPa reflect the intensity of front,and the region magnitudes of Q  frontogenesis function could be used to locate the snowfall area. Q  divergence at the 700hPa has positive correlation with the development and the intensity of heavy preciptitation in winter in Yunnan.

关 键 词：强降水 湿Q矢量 锋生函数 散度场 500hPa 辐合线 影响系统 冬季 地面 应用 

分 类 号：P458[天文地球—大气科学及气象学] P457.6