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

i

Hydrothermal Heat Enhances Abyssal Mixing in the Antarctic Circumpolar Current

Supporting Files

2019
By Downes, Stephanie M. ; Sloyan, Bernadette M. ; Rintoul, Stephen R. ; ...

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Journal Title:

Geophysical Research Letters
Personal Author:

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

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

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

General Earth And Planetary Sciences Geophysics General Earth And Planetary Sciences General Earth And Planetary Sciences
Source:

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

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

0094-8276 ; 1944-8007
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Rights Information:

Other
Compliance:

Library
Main Document Checksum:

urn:sha256:c782d3a54c3715cfa48cd0cee70ba2e38422cdc4c08f23df4fa597fe71d9b3d5
Download URL:

https://repository.library.noaa.gov/view/noaa/53031/noaa_53031_DS1.pdf
File Type:

[PDF - 2.48 MB ]

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