Empirical model for mean temperature and assessment of precipitable water vapor derived from GPS  

作　　者：Tang Yanxin Liu Lilong Yao Chaolong 

机构地区：[1]College of Geomatic Engineering and Geoinformatics,Guilin University of Technology [2]Guangxi Key Laboratory of Spatial Information and Geomatics

出　　处：《Geodesy and Geodynamics》2013年第4期51-56,共6页大地测量与地球动力学（英文版）

基　　金：supported by the National Natural Science Foundation of China(41064001;41071294);Guangxi Key Laboratory of Spatial Information and Geomatics(GuiKeJi 1103108-06);the Natural Science Foundation of Guangxi(2012GXNSFAA053183)

摘　　要：The estimation of Precipitable Water Vapor （PWV） derived from Global Positioning System （GPS） data at the IGS site WUHN is assessed by comparing with PWV obtained from radiosonde data （No.57494） in Wuhan. The applicability of Saastamoinen （SAAS）, Hopfield and Black models used for estimating Zenith Hydrostatic Delay （ZHD） and Zenith Wet Delay （ZWD） and different models is verified in the estimation of GPS-derived PWV for the applied area. The experimental results demonstrated that ： 1 ） the precision of PWV estimated from Black model used for calculating ZHD （ ZHDs ） is lower than that of SAAS （ ZHDsAAs ） model and Hopfield model （ZHDn） with the RMS of 4. 16 ram; 2） the RMS of PWV estimated from SAAS model used for calculating ZWD （SAAS） is 3.78 ram; 3 ） the well-known Bevis model gives similar accuracy compared with the site-specific models for Tm in terms of surface temperature （ Ts ） and surface pressure （Ps）, which can reach the accuracy inside 1 mm in the GPS-derived PWV estimates.The estimation of Precipitable Water Vapor （PWV） derived from Global Positioning System （GPS） data at the IGS site WUHN is assessed by comparing with PWV obtained from radiosonde data （No.57494） in Wuhan. The applicability of Saastamoinen （SAAS）, Hopfield and Black models used for estimating Zenith Hydrostatic Delay （ZHD） and Zenith Wet Delay （ZWD） and different models is verified in the estimation of GPS-derived PWV for the applied area. The experimental results demonstrated that ： 1 ） the precision of PWV estimated from Black model used for calculating ZHD （ ZHDs ） is lower than that of SAAS （ ZHDsAAs ） model and Hopfield model （ZHDn） with the RMS of 4. 16 ram; 2） the RMS of PWV estimated from SAAS model used for calculating ZWD （SAAS） is 3.78 ram; 3 ） the well-known Bevis model gives similar accuracy compared with the site-specific models for Tm in terms of surface temperature （ Ts ） and surface pressure （Ps）, which can reach the accuracy inside 1 mm in the GPS-derived PWV estimates.

关 键 词：GPS radiosonde data Zenith Hydrostatic Delay （ZHD） Zenith Wet Delay（ZWD） the weighted mean temperature of the atmosphere Precipitable Water Vapor（PWV） 

分 类 号：P426[天文地球—大气科学及气象学]