1)Southwest University of Science and Technology, School of Environment and Resource, Mianyang 621010;2)Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030; 3)Graduate School of the Chinese Academy of Sciences, Beijing 100039
Abstract：The zenith tropospheric delay (ZTD) and zenith wet delay (ZWD) derived from the European Center for MediumRange Weather Forecasts data (ECMWF ZTD/ZWD) were assessed by calculating ZTD/ZWD from GPS observations, and the calculation method was also discussed. The results show that the bias and rms for the ECMWF ZTD are about -1 cm and 2 cm respectively, the absolute values of which for ECMWF ZWD at BJFS and LHAS sites are 1 cm and 1.6 cm respectively.
