南海北部内孤立波三维数值模拟

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1、而第一模态内孤立波则由全日分潮与半日分潮的共同支配；吕宋海峡温盐分布的纬向不均匀能够显著增加西传内孤立波波列中内孤立波的数量及振幅，但不会影响吕宋海峡西传大振幅内孤立波的三维生成过程与源地，在研究，尤其是预报源自吕宋海峡的内孤立波，时应考虑其影响。关键词：南海北部；内孤立波；数值模拟；MITgcm万方数据Three-dimensionalnumericalsimulationsofinternalsolitarywavesinthenorthSouthChinaSeaAbstractMostofformerstudiesoninternals

2、olitarywaves(ISWs)innorthSouthChinaSea(SCS)arelimitedbyidealizedtopographyand2-Dmodel.Butrecentstudiesshowstrong3-DfeaturesinthegenerationandpropagationprocessesofISWsfromtheLuzonStrait(LS).Togetabetterunderstandingofthe3-Dfeaturesintheprocessesabove,ahighresolution,nonhydr

3、ostaticmodelbasedonrealtopographyandtidalforcehasbeenappliedinthenorthSCS,includingthewholeLS.Themodelresultshavebeencomparedwithwidelyusedtidaldatabase,in-situobservationandSARimagestoprovetheirreliability.Theevolutionofseasurfacegradientshowsthatthea-waveinnorthSCScomesfr

4、omwave-waveinteractionbetweeninternalwavesfromsouthwestofSabtangIslandandmiddleofHengchunsill.Andtheevolutionofbaroclinicenergyfluxdistributionshowsthattheb-wavecomefromthesouthofTaiwanIslandandnorth-centralofHengchunsill.Eightareaslocationonbotheasternandwesternridgesinthe

5、LSareidentifiedasgenerationsitesofISWsthroughanalysisofbaroclinicenergyfluxandsomenon-dimensionalparametersintheLS.Three-dimensionalfeaturesduringthegenerationprocessesarealsoreferred.Theinternalwavesgeneratedintheseareasareeithergeneratedbymixinglee-wavemechanismorinternal

6、tidemechanism.AndthelargeamplitudeISWswithlongcrestlinescomefromwave-waveinteractionbetweensomeoftheseeightgenerationsites.Sensitivityexperimentsshowthattheb-waveisdominatedbysemi-diurnaltide(M2)withlittleconnectiontodiurnaltides,whilea-wavearedominatedbybothdiurnalandsemid

7、iurnaltides.Similarly,themode-2ISWsaredominatedbysemi-diurnaltide万方数据(M2),whilethemode-1ISWsaredominatedbybothdiurnalandsemidiurnaltides.Besides,K1tideitselfcannotgenerateanysignificantISWs.Anothersensitivityexperimentshowthatthezonalasymmetrydistributionoftemperatureandsal

8、taroundtheLScansignificantenhancetheISWsinthenorthSCS,butthiscannotchangethegenera