Applicability evaluation of relative humidity in kilometer level reanalysis data in Hubei Province

Using observation data from 82 national meteorological stations in Hubei Province,this study evaluates the applicability of daily average,daily maximum,and daily minimum relative humidity of CARAS-1km (China Atmospheric Realtime Analysis Products) reanalysis data from 2008 to 2021 in Hubei Province by analyzing indicators such as correlation coefficient,root mean square error (RMSE),and mean bias (MB),and further explores the applicability of the five parts in Hubei Province in different seasons.The results show that:CARAS has good applicability in the Hubei region for daily average and minimum relative humidity,with spatial correlation coefficients of 0.91 and 0.94,respectively; The daily average relative humidity is mainly positive deviation,while the daily minimum and maximum relative humidity are mainly negative deviation; The daily average,daily maximum,and daily minimum relative humidity have good applicability in the southwestern region of Hubei.The applicability of daily average and daily minimum relative humidity (from April to October) is good,while the situation of daily maximum relative humidity is opposite.The daily average relative humidity is most suitable in winter in northeastern Hubei,while in other seasons it is in southwestern Hubei; The minimum daily relative humidity is most suitable in spring and summer in northeastern Hubei; The area with the best applicability of maximum relative humidity in summer is northwest Hubei,and the rest of the seasons are southwest Hubei.The temporal correlation coefficient reaches its maximum at 13:00 (Bejing Time),and the root mean square error is smallest at 10:00.It has a negative deviation from 01:00 to 11:00 and a positive deviation from 12:00 to 23:00.The daily variation characteristics of the three evaluation elements have basically the same trend in each region.The resolution of high-precision CARAS reanalysis data is better than that of current mainstream reanalysis data.Through scientific evaluation of the applicability of CARAS relative humidity,it is hoped to provide scientific reference for the application and correction of CARAS relative humidity data.Overall,the daily average and maximum relative humidity have good applicability in Hubei and can provide data support for meteorological services.