Accuracy and Variation Characteristics of GPS Precipitable Water Vapor in Chenzhou Area

doi:10.14088/j.cnki.issn0439-8114.2018.11.003

Abstract

Abstract: Based on the GPS data sounded from GPS/MET networks inn Chenzhou area（Yongxing,Yizhang,Guiyang,Rucheng and Guidong） from January to December 2017,the hourly precipitable water vapor （PWV） has been retrieved by using Saastamoinen hydrostatic delay model and Bevis empirical formula,combining the surface atmospheric pressure and temperature. The accuracy of PWV retrieved from GPS data,the temporal-spatial variation of PWV and the relationship between PWV with other atmospheric elements as well have been discussed. The results indicate that the reliability of PWV retrieved from GPS data is verified compare with the PWV based on the radiosonde observation sub-second data in Chenzhou area,and the mean bias is 1.717 7 mm,the root mean square error is 3.258 0 mm. The monthly mean PWV presented single peak distribution,which reached the global maximum value in summer（June to August） and dropped down to the global minimum value in winter（November to January）. Due to surface evaporation and local circulation,the daily variation of PWV presented two peaks distribution that the relative maximum values assumed at about 16：00 and 00：00,and the variation characteristics of PWV could be used as instruction on the precipitation forecast somewhat because the PWV usually increases before heavy rainfall.

Key words: GPS/MET, precipitable water vapor, detecting accuracy, variation characteristics, Chenzhou area

CLC Number:

P406

LUO Lin-yan, LUO Yu, DUAN Si-ru, LYU Guan-ru, WEN Li-heng, FAN Jia-zhi. Accuracy and Variation Characteristics of GPS Precipitable Water Vapor in Chenzhou Area[J]. HUBEI AGRICULTURAL SCIENCES, 2018, 57(11): 14-18.

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