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ID:42687209
大小:178.00 KB
页数:16页
时间:2019-09-20
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1、FormationoftheSouthPacificShallowSalinityMinimum:ASouthernOceanPathwaytotheTropicalPacificIntheeasternSouthPacificOcean,atadepthofabout200m,asalinityminimumisfound.Thisminimumisassociatedwithaparticularwatermass,the''ShallowSalinityMinimumWater11(SSMW).SSMWoutcropsinafreshtongue(SAsub口⑺人)centereda
2、tabout45°S.TheSAsubmin人appearstoemanatefromtheeasternboundary,againstthemeanflow.ThewatermasstransformationthatcreatesSSMWandSAsubminAisinvestigatedhere.TheSAsubminAandSSMWaretransformedfromsaltierandwarmerwatersoriginatingfromthewesternSouthPacific.Thefresheningandcoolingoccurwhenthewaterisadvect
3、edeastwardatthepolewardsideofthesubtropicalgyre.Sourcesoffresheningandcoolingareair-seaexchangeandadvectionofwaterfromsouthofthesubtropicalgyre.Afreshwaterandheatbudgetforthemixedlayerrevealsthatbothsourcesequallycontributetothewatermasstransformationinthemixedlayer.Thefreshenedandcooledmixedlayer
4、waterissubductedintothegyreinterioralongthesouthernrimofthesubtropicalgyre.Subductionintothezonalflowrestrictsthetransformationofinteriorpropertiestodiffusiononly.Asimpleadvection/diffusionbalaneerevealsdiffusioncoefficientsoforder2000mAsup2AsAsup-1A.ThetongueshapeoftheSAsubmin^isexplainedfromadyn
5、amicalviewpointbecausenorelationtoapositiveprecipitation-evaporationbalaneewasfound.FreshestSAsubmin人valuesarefoundtocoincidewithslowesteastwardmixedlayerflowthataccumulatesthelargestamountsoffreshwaterinthemixedlayerandcreatesthefreshtongueattheseasurface.AlthoughtheSSMWisthedensestandfreshestmod
6、eofwatersubductedalongtheSouthAmericancoast,thefresheningandcoolingintheSouthPacificaffectawholerangeofdensities(25.0-26.8kgmAsup-3A).Thetransformedwaterturnsnorthwardwiththegyrecirculationandcontributestothehydrographicstructureofthegyrefarthernorth.BecausetheSouthPacificprovidesmostofthesourcewa
7、tersthatupwellalongtheequatorialPacific,variabilityinSouthPacifichydrographymayinflueneeequatorialPacifichydrography.Becauseone-halfofthetransformationisfoundtobecontrolledthroughEkmantransport,variabilityinwindf
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