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                        Accuracyvalidationofremotesensingandreanalysisevapotranspirationdata:
                          AcomparativestudybasedonGRACEandmonthlywaterbalancemodel
                                                                                                        1
                                         1,2
                                                                                       1
                                                          1,2
                                                                        3
                           1
                 YUNZhaode,HUQingfang ,WANGYintang ,WUHaiyan,WANGLeizhi,SHANGShouwei
                    (1.NanjingHydraulicResearchInstitute,StateKeyLaboratoryofHydrology,WaterResources&HydraulicEngineeringScience,
                                                    Nanjing 210029,China;
                                  2.YangtzeInstituteforConservationandDevelopment,Nanjing 210098,China;
                                    3.HuzhouMunicipalBureauofWaterResources,Huzhou 313000,China)
                  Abstract:TheactualevapotranspirationmonthlyseriesET GRACE andET WBM wereconstructedbyusingtheGRACE
                  terrestrialwaterstoragechangedataandmonthlyWaterBalanceModelwithDoubleParameters (WBM- DP)re
                  spectively.Taking thisasthe benchmark , the performance oftwo remote sensing evapotranspiration data
                  (MOD16,SSEbop)andanatmosphericreanalysisdata(GLDAS - Noah)intheupperHanjiangRiverbasinwere
                  evaluated.TheresultsshowthattheevapotranspirationreferenceseriesobtainedbyGRACEdataandWBM- DPin
                  theupperHanjiangRiverbasinfrom 2006to2014arecloseattheannualscale,buttherearesignificantdiffer
                  encesatthemonthlyscale.WBM- DPcansimulatetheseasonalvariationcharacteristicsofterrestrialwaterstorage
                  betterundertheinfluenceofprecipitationandpotentialevapotranspiration,andWBM - DP - basedevapotranspiration
                  benchmarksequenceisalsomorereasonable.However,thevariationofwaterstorageinthebasinreflectedbythe
                  GRACEdataisunreasonable,sothebenchmarksequenceofmonthlyevapotranspirationcalculatedaccordingtothe
                  waterbalanceequationalsohasanomalies.Onthemonthlyscale ,thedifferenceofthebenchmarkserieswilllead
                  tonon - uniformchangesintheprecisionindexofevapotranspirationdata ,soitsimpactcannotbeignored.Atthe
                  sametime ,theresultsofaccuracyevaluationmayalsobedifferent.Ineachmonthofnon - floodperiod,when
                  ET WBM isusedasthebenchmark,thecomprehensiveaccuracyofMOD16isthebest;whenET GRACE istakenasthe
                  benchmark ,SSEbopisthebest.ComparedwithET GRACE ,thequantitativeaccuracydifferencesofMOD16,Noah
                  andSSEboparemoresignificantwhen ET WBM isusedasthebenchmark.Thepaperdeepenstheunderstandingofthe
                  applicabilityofGRACEdata ,andprovidesareferencefortheaccuracyevaluationanddataoptimizationofsatellite
                  remotesensingandatmosphericreanalysisevapotranspirationdata.
                  Keywords:GRACE;WaterBalanceModel;remotesensingevapotranspiration;atmosphericreanalysis


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