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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ftunivtasmania:oai:eprints.utas.edu.au:39772 2023-05-15T13:42:39+02:00 Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current Downes, SM Sloyan, BM Rintoul, SR Lupton, JE 2019 application/pdf https://eprints.utas.edu.au/39772/ https://eprints.utas.edu.au/39772/1/133811%20-%20Hydrothermal%20heat%20enhances%20abyssal%20mixing%20in%20the%20Antarctic%20Circumpolar%20Current.pdf en eng Amer Geophysical Union https://eprints.utas.edu.au/39772/1/133811%20-%20Hydrothermal%20heat%20enhances%20abyssal%20mixing%20in%20the%20Antarctic%20Circumpolar%20Current.pdf Downes, SM orcid:0000-0002-5595-7243 , Sloyan, BM, Rintoul, SR orcid:0000-0002-7055-9876 and Lupton, JE 2019 , 'Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current' , Geophysical Research Letters, vol. 46, no. 2 , pp. 812-821 , doi:10.1029/2018GL080410 <http://dx.doi.org/10.1029/2018GL080410>. hydrothermal plumes geothermal heat Southern Ocean vertical mixing upwelling Antarctic Circumpolar Current Article PeerReviewed 2019 ftunivtasmania https://doi.org/10.1029/2018GL080410 2022-01-17T23:18:07Z 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 500 m 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 Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean The Antarctic Geophysical Research Letters 46 2 812 821 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
hydrothermal plumes geothermal heat Southern Ocean vertical mixing upwelling Antarctic Circumpolar Current |
spellingShingle |
hydrothermal plumes geothermal heat Southern Ocean vertical mixing upwelling Antarctic Circumpolar Current Downes, SM Sloyan, BM Rintoul, SR Lupton, JE Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current |
topic_facet |
hydrothermal plumes geothermal heat Southern Ocean vertical mixing upwelling Antarctic Circumpolar Current |
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 500 m 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://eprints.utas.edu.au/39772/ https://eprints.utas.edu.au/39772/1/133811%20-%20Hydrothermal%20heat%20enhances%20abyssal%20mixing%20in%20the%20Antarctic%20Circumpolar%20Current.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://eprints.utas.edu.au/39772/1/133811%20-%20Hydrothermal%20heat%20enhances%20abyssal%20mixing%20in%20the%20Antarctic%20Circumpolar%20Current.pdf Downes, SM orcid:0000-0002-5595-7243 , Sloyan, BM, Rintoul, SR orcid:0000-0002-7055-9876 and Lupton, JE 2019 , 'Hydrothermal heat enhances abyssal mixing in the Antarctic Circumpolar Current' , Geophysical Research Letters, vol. 46, no. 2 , pp. 812-821 , doi:10.1029/2018GL080410 <http://dx.doi.org/10.1029/2018GL080410>. |
op_doi |
https://doi.org/10.1029/2018GL080410 |
container_title |
Geophysical Research Letters |
container_volume |
46 |
container_issue |
2 |
container_start_page |
812 |
op_container_end_page |
821 |
_version_ |
1766170829550256128 |