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                                Enhancingsoilheatfluxestimationwiththeconsiderationof
                                        precipitationandairtemperatureinfluences
                                                                                        1,2
                                                                                                 1,2
                                                   1,2
                                                                    1,3
                                     1,2
                      CHANGHongfang ,CAIJiabing ,XIAOChun’an ,ZHANGBaozhong ,XUDi
                            (1.StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteof
                                      WaterResourcesandHydropowerResearch ,Beijing 100038,China;
                        2.NationalCenterforEfficientIrrigationEngineeringandTechnologyResearch - Beijing,Beijing 100048,China;
                      3.StateKeyLaboratoryofWaterResourcesEngineeringandManagement,WuhanUniversity,Wuhan 430072,China)
                  Abstract:Soilheatfluxisanimportantelementofsurfaceenergybalance,holdingasignificantroleinaccurately
                  estimatingwaterbudgetduringeco - hydrologicalprocessesinfarmlandandregion.Inestimatingsoilheatflux ,the
                  estimateddaily - scalesoilheatfluxvaluesincropgrowthseasonbytheconventionalsemi - theoreticalandsemi - em
                  piricalmethodsarealwayspositivethatdonotalignwiththefieldobservations.Inthisstudy ,thesoilheatflux
                  modelbasedonvegetationgrowthwasrevisedbyquantifyingtheinfluenceofprecipitationandairtemperaturechan
                  gesexpressedusingspecialdesignfactors.Utilizingthemeasurementsfrom theHetaoirrigationdistrictinInner
                  MongoliaforsunflowerandBeijing’sDaxingdistrictforwinterwheatandsummermaize,theparametersofthere
                  visedmodelwerecalibratedandvalidated.Then ,therevisedmodelwastestedandappliedusingdataobtained
                  fromtheglobalfluxnetwork (FLUXNET)sitesintheUnitedStatesformaize - soybeanrotationandinSouthKorea
                  forrice ,combinedwiththefractionalvegetationcoverfromremotesensingsatellites.Resultsshowedthat:(1)By
                  incorporatingprecipitationandairtemperaturefactors,therevisedmodeleffectivelyaccountedfortheinfluenceof
                  meteorologicalvariationsonsoilheatfluxandcouldaccuratelyestimatethenegativevaluesofdaily - scalesoilheat
                  fluxduringcropgrowthseason.(2)Comparedtoobservations,therevisedmodelprovidedaccurateestimatesof
                  soilheatfluxacrossdifferentregionsandcroptypesforyears,withtherangesofdeterminationcoefficient,root
                                                                                                      2
                  meansquareerror ,theindexofmodelagreement,andmeanrelativeerrorof0.54 - 0.63,3.30 - 11.70W?m ,
                  0.82 - 0.88,and- 13.4%- 11.70%,respectively.(3)BasedontheMonteCarlomethod,thekeycoefficients α
                  andzintherevisedmodelweredeterminedas0.1and10 - 20,respectively.(4)Thesensitivityanalysisoffactors
                  revealedthattheairtemperaturehadamoreimportantinfluenceontherevisedmodel.Achangeof1℃ inairtem
                  peraturecouldresultina10%- 25% variationinestimatingsoilheatflux.Thesefindingsserveasabeneficialref
                  erenceformitigatingthesurfaceenergyimbalanceandprovidevaluabletechnicalsupportforprecisesoilheatflux
                  estimationinlarge - scaleremotesensinginversions.
                  Keywords:soilheatflux;irrigationdistrict;airtemperature;precipitation;energybalance

                                                                                    (责任编辑:王 婧)

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