Abstract: The atmosphere weighted average temperature T_m is the key parameter that determines the accuracy of GPS water vapor retrieval. There are regional differences in T_m in different regions. Based on the meteorological data of Nanyang sounding station in Henan province from 2015 to 2018, the single-factor and multi-factor atmospheric weighted average temperature models suitable for Henan subtropical monsoon climate are established. At the same time, the seasonal model is constructed according to the division of the four seasons, and its accuracy is analyzed by comparing the empirical model. The results show that the accuracy of the newly established weighted average temperature model is better than that of the Bevis model as a whole. When it is applied to the inversion of GPS precipitable water at CORS station, compared with the empirical model, the newly built T_m model is more consistent with the actual precipitation, and can meet the requirements of foundation GPS precipitation inversion.

Key words: sounding data, weighted average temperature, Henan area, atmospheric precipitable water vapor, CORS