《Responses of the circulation and water mass in the Beibu Gulf to the seasonal forcing regimes》.pdf

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《Responses of the circulation and water mass in the Beibu Gulf to the seasonal forcing regimes》.pdf

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Acta0ceanoLSi．，2014，Vo1．33，No．7，P 1-11 D0I：1O．1007／s13131．014．05066 http：／／www．hyxb．org．cn E—mail：hyxbe@263．net ResponsesofthecirculationandwatermassintheBeibuGulfto theseasonalforcingregim es GAO]ingsong，，SHIMaochong，CHENBo，GUOPeifang．ZHAODongliang OceanUniversityofChina，Qingdao266003，China GuangxiKeyLaboratoryofMarineEnvironmentalScience，GuangxiAcademyofSciences，Nanning 530007．China Received13January2013；accepted7January2014 ~TheChineseSocietyofOceanographyandSpringer-VerlagBerlinHeidelberg2014 Abstract Inthepast20a，thegulf．scalecirculationinht eBeibuGulfhasbeencomm onlyacceptedtobedrivenbya windstressordensiytgradient．However,usingthreesensitiveexperimentsbasedonathree—dimensional baroclinicmodelthatwasverifiedbyobservations。theformationmechanismswererevealed：thecircula— tioninthenorhternBeibuGulfwastriggeredbythemonsoonwindthroughoutayear；whereashtesouthern gulfcirculationwasdrivenbythemonsoonwindandSouthChinaSea(SCS1circulationinwi nterandsum— met,respectively．Theforceofheatfluxandtidalharmonicshadastrongeffectoilhtecirculationstrength andrange．aswellasthelocalcirculationstructures．butthesefactorsdidnotinfluencethemaiorcirculation structureintheBeibuGulf_0ntheotherhna d，theBeibuGulfColdWalterMass(BGCWM)woulddisappera withouttheforceofheatfluxbecausetheseasonal thermoclinelayerwasgeneratedbytheinputofheat sothattheverticalmixingbetweentheupperhotwaterna dlowercoldwaterwasblocked．Inaddition，the wind—inducedcyclonicg，reinthenorthernug lfwasfavorabletotheexistenceoftheBGCWM ．However, thecoverageareaoftheBGCWM wasincreasedslightlywithouttheforceofthetidalhramonics．Whenthe mode1wasdrivenbythemonthlyaveragedsurfaceforcing．thecirculationstructurewaschangedtosome extent，andthecoverageareaoftheBGCWM almostextendedoutwards100％，implyingthecirculationand watermassintheBeibuGulfhadstrongresponsestothetemporalresolutionofthesurfaceforces． Keywords：Princetonoceanmode1(PoM)，BeibuGulf(Gu1f0fTbnkin)，circulation，coldwatermass，response Ci