A Numerical Study on the Density Driven Circulation in the Yellow Sea Cold Water Mass

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摘要 ThecirculationofYellowSeaColdWaterMass(YSCWM)intheSouthernYellowSeaisinvestigatedusingadiagnostic2DMITgcmmodel.Theresolutionofthecomputationalgridis900minthehorizontaland2mintheverticalwhereaninitialtemperaturedistributioncorrespondingtoatypicalmeasuredYellowSeaColdWaterMasswasapplied.TheexistenceofYSCWMthatcausesfluiddensitydifference,isshowntoproducecounter-rotatingcyclonichorizontaleddiesinthesurfacelayer:theinneroneisanti-cyclonic(clockwise)andrelativelyweaker(8–10cms-1)whiletheouteroneiscyclonic(anti-clockwise)andmuchstronger(15–20cms-1).ThisresultisconsistentwiththesurfacepatternobservedbyPangetal.(2004),whohasshownthatamesoscaleanti-cycloniceddy(clockwise)existsintheupperlayerofcentralsouthernYellowSea,andabasin-scalecyclonic(anticlockwise)gyreliesoutsideoftheanti-cycloniceddy,basedonthetrajectoriesanddriftingvelocitiesof23drifters.Belowthethermocline,thereisananti-cyclonic(clockwise)circulation.ThiscomplexcurrenteddysystemisconsideredtobecapableoftrappingsuspendedsedimentsanddepositingthemnearthefrontbetweenYSCWMandthecoastalwatersofftheSubeicoast,providinganexplanationonthesedimentdepthandsizedistributionofmudpatchesintheSouthernYellowSea.Moreover,sensitivetestscenariosindicatethatvariationsofbottomfrictiondonotsubstantiallychangethemainfeaturesofthecirculationstructure,butwillreducethebottomcurrentvelocity,increasethesurfacecurrentvelocityandweakentheupwellingaroundthefrontalarea.
机构地区 不详
出版日期 2015年03月13日(中国期刊网平台首次上网日期,不代表论文的发表时间)
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