Verification and Correction of FY-4A Solar Radiation Products in Guizhou Mountainous Areas
Based on the ground solar irradiance observation data of national meteorological stations(Congjiang,Sansui,Tongzi,Guiyang,Ziyun,Xingren and Weining stations)in the Guizhou mountainous areas from March 12,2018 to February 28,2019,this study tried to verify and correct the accuracy of FY-4A surface solar irradiance(SSI)products.The results show that:(1)The range of FY-4A SSI value is smaller than that of the ground observations.On average,the FY-4A SSI of each station is higher than that of ground observations,and the accuracy under clear sky conditions is much higher than that under cloudy conditions.The deviation is the smallest at noon and the largest in the afternoon.(2)The FY-4A SSI and the ground observed SSI have relatively consistent diurnal and seasonal variations.There is a significant positive correlation between the two,and the correlation coefficient is negatively correlated with altitude.(3)The average deviation tends to decrease with the increase of ground observation.When the ground observed SSI is greater than 800 W·m-2,the FY-4A SSI tends to be lower than that of ground observation.(4)After thresholding the ground observed SSI,the FY-4A SSI is corrected using multiple linear regression.The corrected product has good applicability in Guizhou.
ground solar irradianceGuizhou mountainous areasverificationFY-4Amultiple linear regression