Hydrothermal Heat Enhances Abyssal Mixing in the Antarctic Circumpolar Current

Downes, Stephanie M.; Sloyan, Bernadette M.; Rintoul, Stephen R.; Lupton, John E.

doi:10.1029/2018gl080410

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i

Hydrothermal Heat Enhances Abyssal Mixing in the Antarctic Circumpolar Current

2019
By Downes, Stephanie M. ; Sloyan, Bernadette M. ; Rintoul, Stephen R. ; ...
Source: Geophysical Research Letters, 46(2), 812-821

[PDF-2.48 MB]

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Downes, Stephanie M. ; Sloyan, Bernadette M. ; Rintoul, Stephen R. ; Lupton, John E.

Downes, Stephanie M. ; Sloyan, Bernadette M. ; Rintoul, Stephen R. ; Lupton, John E. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) Less -
Description:

Upwellingintheworld'sstrongestcurrent,theAntarcticCircumpolarCurrent,isthoughtto bedrivenbywindstress,surfacebuoyancyflux,andmixinggeneratedfromtheinteractionbetweenbottomcurrentsandroughtopography.However,theimpactoflocalizedinjectionofheatbyhydrothermalvents wheretheAntarcticCircumpolarCurrentinteractswithmid-oceanridgesremainspoorlyunderstood. Hereacircumpolarcompilationofheliumandphysicalmeasurementsareusedtoshowthatwhilegeothermalheatistransferredtotheoceanoverabroadareabyconduction,heattransferbyconvection dominatesnearhydrothermalvents.Buoyanthydrothermalplumesdecreasestratificationabovethevent sourceandincreasestratificationtothesouth,alteringthelocalverticaldiffusivityanddiapycnalupwellingwithin500moftheseafloorbyanorderofmagnitude.Boththeheliumtracerandstratificationsignals inducedbyhydrothermalinputareadvectedbytheflowandinfluencepropertiesdownstream.
Keywords:

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General Earth And Planetary Sciences Geophysics
Source:

Geophysical Research Letters, 46(2), 812-821
DOI:

https://doi.org/10.1029/2018gl080410
ISSN:

0094-8276;1944-8007;
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PDF
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American Geophysical Union (AGU)
Document Type:

Journal Article
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urn:sha256:c782d3a54c3715cfa48cd0cee70ba2e38422cdc4c08f23df4fa597fe71d9b3d5
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https://repository.library.noaa.gov/view/noaa/53031/noaa_53031_DS1.pdf
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