非地转湿Q矢量诊断阿拉善盟一次短时强降水过程  

Diagnosing a short-term heavy rainfall process in Alxa League by non geostrophic wet Q-vector

作　　者：杨嘉琦 Yang Jiaqi(Alxa League Meteorological Bureau,Alxa League 750306)

机构地区：[1]内蒙古阿拉善盟气象局,阿拉善盟750306

出　　处：《气象水文海洋仪器》2025年第1期37-39,共3页Meteorological,Hydrological and Marine Instruments

基　　金：内蒙古自治区气象局引导性创新基金项目“阿拉善荒漠区强降水环流分型及概念模型研究”(nmqxydcx202224)资助。

摘　　要：对阿拉善盟2022-08-21降水过程的环流背景及物理量进行诊断分析,结果表明:降水过程的主要影响系统有副热带高压、700 hPa和850 hPa切变线及地面冷锋,阿拉善盟处于副热带高压外围,水汽条件充沛,热力不稳定条件较强,对流层中低层切变线及地面冷锋在大气斜压不稳定的条件下触发短时强降水;运用非地转湿Q矢量及对降水过程的诊断发现,非地转湿Q矢量流场中矢量箭头指向降水的区域,非地转湿Q矢量散度辐合区与短时强降水的发生区域对应较好,两个物理量结合可以对系统的发展有更好的判断。Diagnostic analysis was conducted on the circulation background and physical quantities of the precipitation process in Alxa League on August 21,2022.The results showed that the main influencing systems of the precipitation process include the subtropical high pressure,700 hPa and 850 hPa shear lines,and surface cold front.Alxa League is located on the periphery of the subtropical high pressure,with abundant water vapor conditions and strong thermal instability conditions.The shear lines in the middle and lower troposphere and the surface cold front trigger short-term heavy precipitation under conditions of atmospheric baroclinic instability.By using non geostrophic wet Q-vectors and diagnosing precipitation processes,it was found that the vector arrows in the non geostrophic wet Q-vector flow field point to the area of precipitation,and the divergence convergence zone of the non geostrophic wet Q-vector corresponds well to the occurrence area of short-term heavy precipitation.The combination of these two physical quantities can provide better judgments on the development of the system.

关 键 词：短时强降水 斜压锋生 非地转湿Q矢量 

分 类 号：P426[天文地球—大气科学及气象学]