Application Research On Retrieving Water Vapor And Fog Haze By ECMWF And GPS

At present,the CORS system has been established in various provinces and cities.The CORS system has been applied to various aspects such as earthquake and meteorology due to its high positioning accuracy,wide coverage,real-time,all-weather,high spatial and temporal resolution.With the maturity of GPS meteorology,the application of CORS systems in meteorology is becoming more and more important.At present,the application of GPS technology in meteorology is mainly used to invert the water vapor content in the atmosphere.According to the basic principle of GPS inversion of water vapor,the high-precision solving software GAMIT is used to solve the observation data of Henan CORS station.The application of Henan CORS system and ECMWF data in the water vapor and fog haze monitoring is analyzed.The main conclusions are as follows:(1)Using three different precision ephemeris products to calculate the tropospheric delay and water vapor of Henan CORS station.Accuracy analysis proves that the real-time inversion of Henan water vapor is feasible.(2)For the problem that the Henan CORS station lacks the meteorological data that needed to invert the water vapor and fog haze,the ECMWF grid data is used for interpolation.And the problem of excessive temperature deviation was corrected.The accuracy of ECMWF-PWV results was evaluated by using the measured PWV and Radio-PWV.The results show that the meteorological data interpolated by ECMWF data has better accuracy.(3)The correlation between fog haze and GPS water vapor,meteorological factors and other pollution factors in Henan area was studied experimentally,and the influence of relative humidity on fog haze concentration was analyzed.This has certain reference value for fog haze control in Henan area.(4)Through the correlation analysis,the multi-step regression and BP neural network method were used to establish the PM2.5 concentration monitoring model in some parts of Henan,and the accuracy of the model was evaluated by the measured PM2.5 data.Well,it has certain practical reference value for fog haze monitoring in Henan.