Study on Precipitable Water Vapor Correction Model of Beijing-Tianjin-Hebei Region Based on Multisource Data Fusion
Products of high precision and spatiotemporal resolution precipitable water vapor(PWV)can be used as reference for short-term precipitation forecasting.GNSS PWV has high accuracy but low spatial resolution.The spatial resolution of ERA5 PWV and EAC4 PWV are high,but the accuracy of Beijing-Tianjin-Hebei region needs to be verified.Taking the Beijing-Tianjin-Hebei region as an example,conducting research on regional PWV correction models by integrating multi-source PWV products,and obtain high spatiotemporal resolution PWV products.Firstly,based on GNSS PWV,the accuracy evaluation of regional ERA5 PWV and EAC4 PWV is carried out.Then,regional ERA5 and EAC4 PWV correction models based on GNSS PWV are constructed,and the correction effect of the models are evaluated by comparing them with the measured GNSS PWV.Finally,high-precision and high spatiotemporal resolution PWV fusion products in Beijing-Tianjin-Hebei region are obtained through regional ERA5 and EAC4 PWV correction.It is shown that the correlation between ERA5 PWV,EAC4 PWV,and GNSS PWV exceeds 0.8.The accuracy of regional correction model is 1 mm in autumn and winter,2 mm in spring,and 5 mm in summer.
万方数据
维普
