Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current
Upwelling in the world's strongest current, the Antarctic Circumpolar Current, is thought to be driven by wind stress, surface buoyancy flux, and mixing generated from the interaction between bottom currents and rough topography. However, the impact of localized injection of heat by hydrotherma...
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Online Access: | https://doi.org/10.1029/2018GL080410 http://ecite.utas.edu.au/133811 |
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ftunivtasecite:oai:ecite.utas.edu.au:133811 2023-05-15T13:55:18+02:00 Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current Downes, SM Sloyan, BM Rintoul, SR Lupton, JE 2019 application/pdf https://doi.org/10.1029/2018GL080410 http://ecite.utas.edu.au/133811 en eng Amer Geophysical Union http://ecite.utas.edu.au/133811/1/133811 - Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current.pdf http://dx.doi.org/10.1029/2018GL080410 Downes, SM and Sloyan, BM and Rintoul, SR and Lupton, JE, Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current, Geophysical Research Letters, 46, (2) pp. 812-821. ISSN 0094-8276 (2019) [Refereed Article] http://ecite.utas.edu.au/133811 Earth Sciences Oceanography Physical Oceanography Refereed Article PeerReviewed 2019 ftunivtasecite https://doi.org/10.1029/2018GL080410 2020-01-06T23:16:22Z Upwelling in the world's strongest current, the Antarctic Circumpolar Current, is thought to be driven by wind stress, surface buoyancy flux, and mixing generated from the interaction between bottom currents and rough topography. However, the impact of localized injection of heat by hydrothermal vents where the Antarctic Circumpolar Current interacts with mid-ocean ridges remains poorly understood. Here a circumpolar compilation of helium and physical measurements are used to show that while geothermal heat is transferred to the ocean over a broad area by conduction, heat transfer by convection dominates near hydrothermal vents. Buoyant hydrothermal plumes decrease stratification above the vent source and increase stratification to the south, altering the local vertical diffusivity and diapycnal upwelling within 500m of the sea floor by an order of magnitude. Both the helium tracer and stratification signals induced by hydrothermal input are advected by the flow and influence properties downstream. Article in Journal/Newspaper Antarc* Antarctic eCite UTAS (University of Tasmania) Antarctic The Antarctic Geophysical Research Letters 46 2 812 821 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
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English |
topic |
Earth Sciences Oceanography Physical Oceanography |
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Earth Sciences Oceanography Physical Oceanography Downes, SM Sloyan, BM Rintoul, SR Lupton, JE Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current |
topic_facet |
Earth Sciences Oceanography Physical Oceanography |
description |
Upwelling in the world's strongest current, the Antarctic Circumpolar Current, is thought to be driven by wind stress, surface buoyancy flux, and mixing generated from the interaction between bottom currents and rough topography. However, the impact of localized injection of heat by hydrothermal vents where the Antarctic Circumpolar Current interacts with mid-ocean ridges remains poorly understood. Here a circumpolar compilation of helium and physical measurements are used to show that while geothermal heat is transferred to the ocean over a broad area by conduction, heat transfer by convection dominates near hydrothermal vents. Buoyant hydrothermal plumes decrease stratification above the vent source and increase stratification to the south, altering the local vertical diffusivity and diapycnal upwelling within 500m of the sea floor by an order of magnitude. Both the helium tracer and stratification signals induced by hydrothermal input are advected by the flow and influence properties downstream. |
format |
Article in Journal/Newspaper |
author |
Downes, SM Sloyan, BM Rintoul, SR Lupton, JE |
author_facet |
Downes, SM Sloyan, BM Rintoul, SR Lupton, JE |
author_sort |
Downes, SM |
title |
Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current |
title_short |
Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current |
title_full |
Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current |
title_fullStr |
Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current |
title_full_unstemmed |
Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current |
title_sort |
hydrothermal heat enhances abyssal mixing in the antarctic circumpolar current |
publisher |
Amer Geophysical Union |
publishDate |
2019 |
url |
https://doi.org/10.1029/2018GL080410 http://ecite.utas.edu.au/133811 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://ecite.utas.edu.au/133811/1/133811 - Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current.pdf http://dx.doi.org/10.1029/2018GL080410 Downes, SM and Sloyan, BM and Rintoul, SR and Lupton, JE, Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current, Geophysical Research Letters, 46, (2) pp. 812-821. ISSN 0094-8276 (2019) [Refereed Article] http://ecite.utas.edu.au/133811 |
op_doi |
https://doi.org/10.1029/2018GL080410 |
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Geophysical Research Letters |
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46 |
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2 |
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812 |
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821 |
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