湖北地基GPS大气可降水量变化特征分析及应用

摘要

In order to analyze the spatial and temporal distribution of water vapor in Hubei province,the ground-based GPS atmospheric Precipitable Water Vapor (GPS/PWV) at Enshi,Yichang and Wuhan site were compared with the radiosounde data(RS/PWV) and found that the GPS/PWV has a good consistency with RS/PWV.The three-year GPS/PWV analysis of 17 stations shows that the GPS/PWV has significant monthly and daily variation features,and its distribution diminishes gradually from the south to the north,but increases gradually from the west to the east in Hubei province.A case analysis on heavy precipitation illustrates that the peak value of GPS/PWV appears slighdy earlier than that of precipitation and radar echo intensity.GPS/PWV with high spatial and temporal resolution combined with radar is conducive to the overall analysis of the synoptic situation and precipitation information.%利用探空资料、地基GPS/MET水汽监测资料,对恩施、宜昌、武汉三站地基GPS反演大气可降水量(GPS Precipitable Water Vapor,GPS/PWV)与探空进行了对比,表明GPS/PWV与探空RS/PWV具有良好的一致性.湖北省17站3 a GPS/PWV资料分析表明,GPS/PWV具有明显的月变化及日变化特征,分布具有从南往北逐渐递减,从西至东逐渐增加的特点.强降水个例分析表明GPS/PWV峰值略早于降水以及雷达回波峰值出现时间,高时空分辨率的GPS/PWV配合雷达对天气形势的分析以及降水的判断有一定的指导作用.