云南地基GPS观测大气可降水量变化特征  

Characteristics of Ground-Based GPS-retrieved PWV in Yunnan

作　　者：符睿[1,2] 段旭[1,2] 刘建宇[1,2] 孙绩华[1,2] 王曼[1,2] 陈新梅[1,2] 刘云香 

机构地区：[1]云南省气象科学研究所 [2]云南省季风与气象灾害研究开放实验室,昆明650034 [3]江西省赣州市气象局,赣州341000

出　　处：《气象科技》2010年第4期456-462,I0009,共8页Meteorological Science and Technology

基　　金：云南省科技攻关及高新技术计划(2006SG25);云南省气象局业务能力研究建设专项重点项目(YZ200903);JICA计划"中日气象灾害合作研究中心";云南省省院校合作计划(2006YX39);云南省应用基础研究面上项目(2009CD145)共同资助

摘　　要：利用2007年云南地基GPS站点观测资料,分析GPS反演的大气可降水量(PWV)变化特征,并用探空、实际降水量资料和GPS反演结果进行比较。结果表明:GPS/PWV能反映云南降水的季节变化特征,海拔较低的测站普遍比同期海拔较高的测站测得的GPS/PWV值高;GPS/PWV值与探空得到的大气水汽总量随时间演变趋势基本一致,其相关系数均达0.89;GPS/PWV变化周期和实际降水发生的周期基本相同,降水大多为GPS/PWV值连续增加达到峰值(或从峰值开始下降)后开始;GPS/PWV上升幅度较大或位于高位可作为连续性强降水过程出现的预报指标,但使用GPS/PWV峰值作预报指标时,还应考虑季节因素。The variation features of GPS-retrieved atmospheric Precipitable Water Vapor（PWV） are analyzed,and a comparison is conducted on the radiosonde observations and the retrieved precipitation（PWV） in Yunnan.The results show that PWV can be used to reflect the seasonal characteristics of precipitation,and the values of PWV from lower elevation stations are generally higher than those of higher elevation stations in the same period;the changing trends of PWV and radiosonde observations are basically the same,and the correlation coefficient is approximately 0.89;the variation periods of PWV and precipitation are also identical,with the precipitation starting mostly following the peak after a consecutive increasing of PWV;the large increasing amplitude（or keeping at high level） of PWV can be used as an indicator for forecasting continuous heavy precipitation,but when the peak value of PWV is used as a forecasting indicator,seasonal factors should be considered also.

关 键 词：云南 地基GPS 大气可降水量 

分 类 号：P426.61[天文地球—大气科学及气象学]