Analysis on the Characteristics of GPS-PWV during Heavy Rainfall in Huaihua Region  

作　　者：Yu LUO Wenjuan GAO Linyan LUO Jiazhi FAN Siru DUAN 

机构地区：[1]China Meteorological Administration Training Center Hunan Branch,Changsha 410125,China [2]Hunan Provincial Meteorological Information Center,Changsha 410118,China

出　　处：《Meteorological and Environmental Research》2020年第3期1-6,11,共7页气象与环境研究（英文版）

基　　金：Supported by the Scientific Research Project of Hunan Meteorological Bureau(XQKJ16B038;XQKJ17B099)。

摘　　要：Using GPS precipitable water vapor( GPS-PWV) inverted based on the advanced ZHD model and localized T_m model,as well as hourly meteorological data from automatic weather station,the variation characteristics of atmospheric water vapor and evolution features of GPS-PWV during 14 heavy rainfall events at Huaihua in 2017 were analyzed. As the results shown,GPS-PWV could reveal the variation characteristics of atmospheric water vapor in Huaihua region well. The monthly change of precipitable water vapor-pressure( PWV-P) data pair was evident. The PWV appeared a lower value with a smaller range accompanied by a 14.75 hPa higher surface air pressure than that in summer when precipitation occurred during winter,which gradually increased with a lower surface air pressure while precipitation occurred during spring. In summer,the PWV rose to the annual peak value with the lowest surface air pressure under rainfall,and it scattered to low-value area in autumn. In 14 heavy rainfall events at Huaihua during flood season of 2017,all of the PWV values exceeded corresponding monthly mean,besides there was a well corresponded relationship between the maximum rainfall and the maximum PWV in hourly scale. Before the heavy rainfall occurred,the PWV increased comparatively distinctly with a clear decrease of the surface air pressure,and that could be a preferably reference point in the local strong precipitation nowcasting.

关 键 词：GPS/MET Precipitable water vapor Detection accuracy Heavy rainfall Huaihua region 

分 类 号：P228.4[天文地球—大地测量学与测量工程] P426.62[天文地球—测绘科学与技术]