简介:OnthebasisofthecharacteristicoftheperfectspatialdistributionoftheT/Paltimeterdata,aspatialharmonictidalanalysisisperformed,whichtransferstidalharmonicconstantsHandgofeachconstituentintoapairofparameters:thecosinepartUandsinepartV.Andeachpartisexpandedintoapolynomial.Thepolynomialcoefficientsareestimatedwithaltimeterdataupontheleastsquarescriteria.ThusthemodelsofprincipaltidalwavesintheSouthChinaSeaareestablished.72cyclesofT/Pdatafromcycle11through82areincludedinthecalculation.Themodelsareevaluatedwithdifferentapproachesanddataset.Theconclusionsarethatthetidemodescanprovidepartialtideamplitudeswith3cmaccuracy,andthatphaselagsdeviationofthosetideswithamplitudelargethan10cmarewithin±10°.
简介:Anewcomputationalprocedureforderivationofmarinegeoidona2.5′×2.5′gridinanon-tidalsystemovertheSouthChinaSeaandthePhilippineSeafrommulti-satellitealtimeterseasurfaceheightsisdiscussed.Single-anddual-satellitecrossoverswereperformed,andcomponentsofdeflectionsoftheverticalweredeterminedatthecrossoverpositionsusingSand-well'scomputationaltheory,andgriddedontoa2.5′×2.5′resolutiongridbyemployingtheShepard'sinterpolationprocedure.2.5′×2.5′gridofEGM96-derivedcomponentsofdeflectionsoftheverticalandgeoidheightswerethenusedasreferenceglobalgeopotentialmodelquantitiesinaremove-restoreproceduretoimplementtheMolodensky-likeformulavia1D-FFTtechniquetopredictthegeoidheightsovertheSouthChinaSeaandthePhilippineSeafromthegriddedaltimeter-derivedcomponentsofdeflec-tionsofthevertical.Statisticalcomparisonsbetweenthealtimeter-andtheEGM96-derivedgeoidheightsshowedthattherewasaroot-mean-squareagreementof±0.35mbetweentheminaregionoflesstectonicallyactivegeologicalstructures.However,overareasoftectonicallyactivestructuressuchasthePhilippinetrench,differencesofabout-19.9mwereobtained.
简介:高度表数据和海洋潮模型的质量对沿海的严肃异例的恢复批评。在这贡献,三重新追踪方法(阀值,改进阀值和Beta-5)与在一个浅水区域上改进高度表数据的目的被调查。比较显示改进阀值是在中国海上的最好重新追踪的方法。二个海洋潮模型,NAO99b和CSR4.0,被分析。不同的潮模型在处理高度表数据使用了的结果表演可以导致差别在恢复沿海的严肃异例的超过10mGal。另外,NAO99b是比在中国海的浅水区域上的CSR4.0更合适的。最后,在中国海上的严肃异例被最少的广场搭配从重新追踪的Geosat/GM和ERS-1/GM数据计算。有shipbornegravimetry数据的比较证明从重新追踪的数据的严肃异例比从non-retracked数据的那些显著地优异。当另外的二导出高度表的严肃当模特儿,我们的结果有一样的顺序:Sandwell&Smith(V16)和DNSC08。