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Temporal-Spatial Distribution Characteristics of Precipitable Water Vapor in Xinjiang Based on Ground-Based GPS

ZHANG Ningning;ZHONG Ping;DU Wencheng;YANG Zhongrong;CHEN Changfu;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University;  
The precipitable water vapor of stations in Xinjiang in 2016 is derived,according to the GPS data of the crustal movement observation network of China,combined with the pressure and temperature of the ERA-Interim model.The spatial distribution and seasonal variation of precipitable water vapor in this area are also analyzed.The results show the feasibility of GPS precipitable water vapor according to the comparison of radiosonde and GPS precipitable water vapor,which has a root mean square error of about 2.7mm.Secondby,the annually averaged precipitable water vapor in Xinjiang is from 7.0to 13.0mm.Altitude is the main factor affecting the spatial distribution of GPS-derived precipitable water vapor;that is,precipitable water vapor decreases by about 1.4mm for each kilometer increase of altitude.For regions at the same altitude,a region that is located at a lower latitude will have a higher content of precipitable water vapor.Thirdly,the seasonal variation of the precipitable water vapor is apparent.The precipitable water vapor is maximum in summer from 12.0to 23.2mm,the minimum is in winter,from 1.4to 5.5mm.The difference of precipitable water vapor between spring and autumn is quite small,and the changes are between summer and winter.
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