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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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