GOCE gravity gradients versus global gravity field models

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1、GeophysicalJournalInternationalGeophys.J.Int.(2012)189,846850doi:10.1111/j.1365-246X.2012.05428.xEXPRESSLETTERGOCEgravitygradientsversusglobalgravityfieldmodelsJohannesBoumanandMartinJ.FuchsDeutschesGeodatischesForschungsinstitut(DGFI),Alfons-Goppel-St

2、r.¨11,80539Munich,Germany.E-mail:bouman@dgfi.badw.deAccepted2012February22.Received2012February22;inoriginalform2010December16SUMMARYTheGOCEmission,apartofESAsLivingPlanetProgramme,aimsatimprovedgravityfieldmodellingathighspatialresolution.On-boardGOCEa

3、gradiometer,incombinationwithascientificon-boardGPSreceiver,measurestheearthsgravityfieldwithunprecedentedaccuracy.ThesemeasurementshavebeenusedtocomputeGOCEgravityfieldsolutionsandcombinedGOCE/GRACEsolutions.Themaindifferencebetweenthesolutionsishowthey

4、incorporatetherequiredaprioriinformation,whichconsistseitherofexistinggravityfieldmodelsorKaulasruleforthesignalvariancesofthegravityfield.WeassessedfourseriesofmodelsbycomparingthegravitygradientstheypredictwiththemeasuredGOCEgradients.Theanalysisofthe

5、gravitygradientsfitsmayrevealdifferencesbetweenthedifferentsolutionsthatcanbeattributedtothesolutionstrategy,assumingthatthemeasurementerrorsarehomogeneous.WecomparedtheGOCEgradientswithexistingstate-of-the-artglobalgravityfieldmodelsandconcludethattheg

6、radienterrorsareindeedgloballyhomogeneous,withGJIGravity,geodesyandtidestheexceptionofthecross-trackgradientespeciallysouthofAustralia.Furthermore,wefindthattheuseofexistingglobalgravityfieldmodelsasaprioriinformationshouldbeavoidedbecausethismayincreas

7、ethegradientresidualsinspatialandspectraldomain.Finally,wemayconcludethattheGOCEandGRACEdataarecompatibleandcomplementary.Keywords:Spatialanalysis;Satellitegeodesy;Spacegeodeticsurveys.measuredGGs.Althoughthisisnotavalidationwithindependent1INTRODUCTI

8、ONdata,suchanassessmentmayrevealdifferencesbetweenthemodelsTheobjectiveofESAsGOCE(Gravityfieldandsteady-stateOceanthatwerecomputedusingdifferentprocessingstrategies.TheideaCirculationExplorer)missionistodeterminetheearthsgravityisthattheerrorso