Applicability of methods for estimating GPS precipitable water in the Qinghai-Tibet Plateau

摘要: Atmospheric weighted mean temperature (Tm) and zenith hydrostatic delay (ZHD) are key parameters in determining the accuracy of GPS precipitable water (PW) estimations. Using radiosonde profiles with a high vertical resolution 10–30 m, we calculated Tm, ZHD PW investigated applicability modeled Tm ZHD, including obtained them, Qinghai-Tibet Plateau (QTP). It is found that (1) bias RMS error Bevis model QTP less than 5% 2%, respectively, diurnal variation small morning large otherwise. (2) The models have an within 1% QTP, which smaller plain Central China, 1.5%. Saastamoinen 0.5% those Hopfield Black models. variations complex varying station. (3) relative increases station altitude, range 12–66% 8% China. similar to ZHD. (4) mainly affected by model, good can improve QTP.