Research On Application And Detection Of Atmospheric Water Vapor Using Ground_Based GPS

Atmospheric water vapor plays a crucial role for climate, dynamics of weathersystem, atmosphere environment, hydrology and geodesy. However, the scarcity inconventional water observation greatly restricts the development of these disciplinesand understanding of water vapor. GPS technology provides a new means for detecting atmosphere with the advantages of continuity, high precision and unaffected byweather et al, which has become powerful supplementation for routine atmospheredetecting system.The article describes in detail the fundamental of detecting water vaporusing ground_based GPS, and processing method of GPS data using the GAMIT/GLOBK software. There are the following some contents in this paper:①The coordinate errorbetween network adjustment using the GLOBK and iterative analysis using GAMIT, is calculated observational data of12GPS monitoringstation for doy152-160in2007using the GAMIT10.40, this data is root in ground_based GPS meteorological monitoring netwok of continuous operation in Hong Kong.Results analysis demonstrates the average coordinate of each monitoring station is nearly equal to precise coordinate.②This paper analyses the comparison between PWV was estimated after usingthe GLOBK and after directly using the GAMIT, this results proves the error of thiscomparison is tiny.③The article states in detail that error sources was calculated ZTD with usingground_based GPS data. The error sources mainly include mapping function models,precision of GPS satellites orbit, multipath error, turn error of vertical position of GPSreceiver causing by change of atmospheric pressure. The experiment includes thenetwork BJFS, URUM, LHAZ, KUNM, and another network BJFS, WUHN, XIAN,TWTF. The two networks conduct the error analysis of estimating PWV. The results display that ZTD and PWV meanwhile change, which prove change of ZTD reflectschange of PWV, and obtaining high precision PWV applys longer baseline network ofmonitoring station and IGS station connection survey.④This paper analyses detection of atmospheric water vapor applys to climaticanalysis.Reseach on PWV for14-21hour, july10in2004and for july10-16in2006,this experiment shows detecting PWV with ground_based GPS data meanwhilechanges torrential rain forecast with meteorological observatory data was discussedby Mao Dongyan et.al. These analysis results prove that using ground_based GPSdata calculated PWV have certain reference function for the mesoscale rain changes.⑤R eseach on PWV of BJFS and URUM for july10-16in2006, this experimentshows the discrepant times of PWV of BJFS and URUM meanwhile turns the discrepant times of annual precipitation between dry-subhumid areas and arid region. Theseanalysis results prove that the climatic regionalization, by using ground_based GPSdata calculated PWV, have certain reference function.⑥Another experiment conducts the comparison of PWV between using ground_based GPS and WVR, in order to guarantee the absolute value of PWV in the weatherfo recast.