Modeling of weighted mean temperature over the Western Pacific region to estimate GPS PWV

Modeling of the weighted mean temperature (T_m) over the West Pacific region to accurately estimate the precipitable water vapor (PWV) derived from ground-based Global Positioning System (GPS) receiver is carried out in this study. T_m is an important parameter in determining the accuracy of PWV measurement. To develop a T_m model, Radiosonde (RS) data from 15 sites that covers the range 20°N to 20°S latitude and 95°E to 156°E longitude for the year of 2011 is employed. Then, a linear regression analysis between T_m and surface temperature (T_s) was established. The T_m model will be compared with global T_m model for validation. This model is demonstrated higher of about 4.5% compared to global T_m model. From the analysis of results, found that any increase in the weighted mean temperature of 1 Kelvin will increase the PWV value by about 0.13 mm.