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Hydrothermal Heat Enhances Abyssal Mixing in the Antarctic Circumpolar Current
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2019
Source: Geophysical Research Letters, 46(2), 812-821
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Journal Title:Geophysical Research Letters
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Description:Upwellingintheworld'sstrongestcurrent,theAntarcticCircumpolarCurrent,isthoughtto bedrivenbywindstress,surfacebuoyancyflux,andmixinggeneratedfromtheinteractionbetweenbottomcurrentsandroughtopography.However,theimpactoflocalizedinjectionofheatbyhydrothermalvents wheretheAntarcticCircumpolarCurrentinteractswithmid-oceanridgesremainspoorlyunderstood. Hereacircumpolarcompilationofheliumandphysicalmeasurementsareusedtoshowthatwhilegeothermalheatistransferredtotheoceanoverabroadareabyconduction,heattransferbyconvection dominatesnearhydrothermalvents.Buoyanthydrothermalplumesdecreasestratificationabovethevent sourceandincreasestratificationtothesouth,alteringthelocalverticaldiffusivityanddiapycnalupwellingwithin500moftheseafloorbyanorderofmagnitude.Boththeheliumtracerandstratificationsignals inducedbyhydrothermalinputareadvectedbytheflowandinfluencepropertiesdownstream.
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Source:Geophysical Research Letters, 46(2), 812-821
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ISSN:0094-8276;1944-8007;
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Rights Information:Other
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Compliance:Library
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