应用GPS可降水量分析河北省一次回流降雪天气  

Analysis of a Return-Flow Snowfall in Hebei Province Using GPS Precipitable Water Vapor

作　　者：李国翠[1] 张迎新 李国平[3] 赵卫亮 

机构地区：[1]石家庄市气象局,石家庄050081 [2]河北省气象台,石家庄050021 [3]成都信息工程学院大气科学学院,成都610225

出　　处：《气象科技》2012年第6期990-995,共6页Meteorological Science and Technology

基　　金：国家科技支撑项目(2008BAC37B01);行业专项(GYHY200906011);国家自然科学基金项目(40875024);中国气象局西南区域气象中心区域重大科研业务项目(2010-3)资助

摘　　要：利用地基GPS反演的可降水量资料、地面加密自动站和常规天气资料,对2011年2月发生在河北省的一次回流降雪天气过程进行了分析。结果表明:①降雪过程前期,GPS可降水量由西南向东北逐渐增大,后期自北向南减小,与西南暖湿气流的输送和地面冷高压的南压对应。②第1阶段降雪的主要影响系统为高空槽,GPS可降水量不断增加,对应的实际降水也是先增后减;第2阶段的降雪主要表现为回流降雪,降雪前期GPS可降水量迅速增长,实际降水出现在GPS可降水量峰值及下降阶段。随着地面冷高压逐渐南压,GPS可降水量逐渐下降,实际降水也逐渐减弱至停止。③在探空层结曲线上,高湿层位于地面附近和700hPa附近,而二者之间的近地层存在着低湿层。Based on the precipitable water vapor received from the ground-based GPS and ground automatic stations, as well as weather data, a return-flow snowfall in Hebei province is studied. The results show that： （1） GPS precipitable water vapor increased from southwest to northeast before the snow, corresponding to the warm and humid southwesterly flow, and decreased from north to south after the snow because of the clod high. （2） The main effect system was the high-level trough in the first stage; GPS precipitable water vapor showed increasing trend, and the actual precipitation increased first and red OCC uced then; the main effect system urred at the peak of GPS precipita move and s near was the return-flow in the second stage, and the actual precipitation wate d from north to south, GPS precipitable r vapor or during water vapor decre ase topped. （3） In the sounding stratification of the return-flow the ground and the 700 hPa layer, and the low humidity laye e decreasing phase. When the cold high d, and the actual precipitation weakened snowfall, the high humidity layers were r was between the high humidity levels.

关 键 词：GPS可降水量 回流降雪 探空层结 

分 类 号：P426.62[天文地球—大气科学及气象学]