Applicability of FY-4A and GPM Satellite Precipitation Data in Xin'anjiang Reservoir Basin
To comparatively evaluate the applicability of GPM and FY-4A satellite precipitation data in the Xin'anjiang Reservoir Basin,the hourly observational areal rainfall and daily GPM's Late Run precipitation data from 2012 to 2022,and FY-4A satellite AGRIL level 2 precipitation data from 2018 to 2022 were used.Seven evaluation indexes were select-ed to comprehensively evaluate multiple aspects such as precipitation error,precipitation temporal evolution characteris-tics,detection capabilities of different levels of precipitation,and heavy rainfall accuracy.The results show that the GPM and FY-4A areal rainfall are consistent with the observational areal rainfall on the daily and monthly scales,and the FY-4A areal rainfall data will be more accurate starting in 2020.There are varying degrees of underestimation of areal rainfall in GPM and FY-4A,and the accuracy of precipitation days is higher from April to September.GPM's recognition ability,accuracy and judgment level of different levels of precipitation processes are better than FY-4A,but the difference be-tween the two datasets decreases as the precipitation intensity increases.FY-4A is more accurate in observing heavy,tor-rential,and downpour rainfall.During heavy rainfall,FY-4A hourly areal rainfall has good consistency with the observa-tional hourly areal rainfall and can accurately reflect the temporal changes of actual areal rainfall;Its peak areal rainfall time is more than 1 h in advance,and the first peak rainfall is overestimated,and the secondary rainfall peak is underesti-mated of the adjacent areal rainfall peaks,which can provide a basis for reservoir regulation and storage forecast and early warning.
Xin'anjiang reservoir basinGPMFY-4Aaccuracy evaluationapplicability analysisevaluation index
万方数据
维普
