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1、AbstractProcessingofShipborneGravimetricDatafortheBransfieldStraitandRegionalGravitationalFieldCharacteristicsABSTRACTAntarcticanditsadjacentseaareaisbecominganimportantregion,becausetherearerichresourcesandanidealplaceforstudyingenvironmentalchange.Bycarryingoutmarine
2、geophysicalsurveyandevaluationanddetectingthestratigraphicdistributioncharacteristicsbeneathAntarcticcontinentalshelf,onecouldobtainsomeimportantinformationenvironmentalchangeswhichhavebeenrecordedbythestratigraphy.Asabasicmethodofmarinegeophysicalinvestigation,marineg
3、ravimetricsurveyisofimportantsignificanceforstudyingthegeologicalandtectoniccharacteristicsandregionaltectonicevolutionintheAntarcticarea,andfurtherinvestigatingAntarcticseaarearesourceandperformingglobalchangestudies.In1984,Chinacarriedoutthefirstmarinegravitysurveyfo
4、rAntarcticPeninsulaandBransfieldStrait.Sincethen,Chinahascarriedout31Antarcticexpeditions,obtainedalargeamountofdatafortheBransfieldStraitandPrydzBay.However,somefactorssuchasseaice,wave,positioningaccuracyandotherfactors,aswellastheskimble-scambleinstrumentsandotheris
5、sues,resultinrelativelylargeaccidentalerrorsandsystematicerrorsinfinalresults.BasedonthemeasureddataintheAntarcticPeninsulaandBransfieldStrait,combinedwiththeinternationalpublicdata,thisstudyadoptsaseriesmethodsincludingprecisioncontrol,least-squareadjustmentmethod,fus
6、ionofship-derivedgravitydata,gravityfieldandstructureanalysistoanalyzethedata,andeventuallysummarizedasetofmethodswhichissuitableforgravitydataprocessingofpolarseaarea.Theresultsshowedthatbyusingpoint-by-pointanalysis,leastsquaresfiltering,analyzingofcross-couplingcorr
7、ectionandrecalibrationofeötvöseffectcorrectioninsequence,onecanreachtherequirementofcontrollingtheaccuracyinthedataprocessing.ThisstudytookuseofthemeasureddataforthestudyareatoanalyzetheIII南极布兰斯菲尔德海峡船测重力资料处理及区域重力场特征regionalgravitationalfield,andinvertedtheMohodepthofba
8、sedonairyisostaticmodel,andcalculatedthegravityanomaliesbasedonisostaticcorrection.Theresultsobtainedabove,combinedwi
