Controls on turbulent mixing on the West Antarctic Peninsula shelf
The ocean-to-atmosphere heat budget of the West Antarctic Peninsula is controlled in part by the upward flux of heat from the warm Circumpolar Deep Water (CDW) layer that resides below ~200 m to the Antarctic Surface Water (AASW), a water mass which varies strongly on a seasonal basis. Upwelling and...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://pure.uhi.ac.uk/en/publications/4a045d12-531a-422f-94df-7d20a15f1219 https://doi.org/10.1016/j.dsr2.2017.02.011 https://pureadmin.uhi.ac.uk/ws/files/2403050/Brearley_et_al_DSR2_2017.pdf http://www.scopus.com/inward/record.url?scp=85016728320&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85016728320&partnerID=8YFLogxK https://eprints.soton.ac.uk/406465/ |
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ftuhipublicatio:oai:pure.atira.dk:publications/4a045d12-531a-422f-94df-7d20a15f1219 2024-09-15T17:42:52+00:00 Controls on turbulent mixing on the West Antarctic Peninsula shelf Brearley, J. Alexander Meredith, Michael P. Naveira Garabato, Alberto C. Venables, Hugh J. Inall, Mark E. 2017-05-01 application/pdf https://pure.uhi.ac.uk/en/publications/4a045d12-531a-422f-94df-7d20a15f1219 https://doi.org/10.1016/j.dsr2.2017.02.011 https://pureadmin.uhi.ac.uk/ws/files/2403050/Brearley_et_al_DSR2_2017.pdf http://www.scopus.com/inward/record.url?scp=85016728320&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85016728320&partnerID=8YFLogxK https://eprints.soton.ac.uk/406465/ eng eng https://pure.uhi.ac.uk/en/publications/4a045d12-531a-422f-94df-7d20a15f1219 info:eu-repo/semantics/openAccess Brearley , J A , Meredith , M P , Naveira Garabato , A C , Venables , H J & Inall , M E 2017 , ' Controls on turbulent mixing on the West Antarctic Peninsula shelf ' , Deep-Sea Research Part II - Topical Studies in Oceanography , vol. 139 , pp. 18-30 . https://doi.org/10.1016/j.dsr2.2017.02.011 Antarctic Ocean tides Ocean-ice-atmosphere system Turbulence Water mixing article 2017 ftuhipublicatio https://doi.org/10.1016/j.dsr2.2017.02.011 2024-08-05T23:36:06Z The ocean-to-atmosphere heat budget of the West Antarctic Peninsula is controlled in part by the upward flux of heat from the warm Circumpolar Deep Water (CDW) layer that resides below ~200 m to the Antarctic Surface Water (AASW), a water mass which varies strongly on a seasonal basis. Upwelling and mixing of CDW influence the formation of sea ice in the region and affect biological productivity and functioning of the ecosystem through their delivery of nutrients. In this study, 2.5-year time series of both Acoustic Doppler Current Profiler (ADCP) and conductivity-temperature-depth (CTD) data are used to quantify both the diapycnal diffusivity κ and the vertical heat flux Q at the interface between CDW and AASW. Over the period of the study, a mean upward heat flux of ~1 W m −2 is estimated, with the largest heat fluxes occurring shortly after the loss of winter fast ice when the water column is first exposed to wind stress without being strongly stratified by salinity. Differences in mixing mechanisms between winter and summer seasons are investigated. Whilst tidally-driven mixing at the study site occurs year-round, but is likely to be relatively weak, a strong increase in counterclockwise-polarized near-inertial energy (and shear) is observed during the fast-ice-free season, suggesting that the direct impact of storms on the ocean surface is responsible for much of the observed mixing at the site. Given the rapid reduction in sea-ice duration in this region in the last 30 years, a shift towards an increasingly wind-dominated mixing regime may be taking place. Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Antarctic Peninsula Sea ice University of the Highlands and Islands: Research Database of UHI Deep Sea Research Part II: Topical Studies in Oceanography 139 18 30 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
Antarctic Ocean tides Ocean-ice-atmosphere system Turbulence Water mixing |
spellingShingle |
Antarctic Ocean tides Ocean-ice-atmosphere system Turbulence Water mixing Brearley, J. Alexander Meredith, Michael P. Naveira Garabato, Alberto C. Venables, Hugh J. Inall, Mark E. Controls on turbulent mixing on the West Antarctic Peninsula shelf |
topic_facet |
Antarctic Ocean tides Ocean-ice-atmosphere system Turbulence Water mixing |
description |
The ocean-to-atmosphere heat budget of the West Antarctic Peninsula is controlled in part by the upward flux of heat from the warm Circumpolar Deep Water (CDW) layer that resides below ~200 m to the Antarctic Surface Water (AASW), a water mass which varies strongly on a seasonal basis. Upwelling and mixing of CDW influence the formation of sea ice in the region and affect biological productivity and functioning of the ecosystem through their delivery of nutrients. In this study, 2.5-year time series of both Acoustic Doppler Current Profiler (ADCP) and conductivity-temperature-depth (CTD) data are used to quantify both the diapycnal diffusivity κ and the vertical heat flux Q at the interface between CDW and AASW. Over the period of the study, a mean upward heat flux of ~1 W m −2 is estimated, with the largest heat fluxes occurring shortly after the loss of winter fast ice when the water column is first exposed to wind stress without being strongly stratified by salinity. Differences in mixing mechanisms between winter and summer seasons are investigated. Whilst tidally-driven mixing at the study site occurs year-round, but is likely to be relatively weak, a strong increase in counterclockwise-polarized near-inertial energy (and shear) is observed during the fast-ice-free season, suggesting that the direct impact of storms on the ocean surface is responsible for much of the observed mixing at the site. Given the rapid reduction in sea-ice duration in this region in the last 30 years, a shift towards an increasingly wind-dominated mixing regime may be taking place. |
format |
Article in Journal/Newspaper |
author |
Brearley, J. Alexander Meredith, Michael P. Naveira Garabato, Alberto C. Venables, Hugh J. Inall, Mark E. |
author_facet |
Brearley, J. Alexander Meredith, Michael P. Naveira Garabato, Alberto C. Venables, Hugh J. Inall, Mark E. |
author_sort |
Brearley, J. Alexander |
title |
Controls on turbulent mixing on the West Antarctic Peninsula shelf |
title_short |
Controls on turbulent mixing on the West Antarctic Peninsula shelf |
title_full |
Controls on turbulent mixing on the West Antarctic Peninsula shelf |
title_fullStr |
Controls on turbulent mixing on the West Antarctic Peninsula shelf |
title_full_unstemmed |
Controls on turbulent mixing on the West Antarctic Peninsula shelf |
title_sort |
controls on turbulent mixing on the west antarctic peninsula shelf |
publishDate |
2017 |
url |
https://pure.uhi.ac.uk/en/publications/4a045d12-531a-422f-94df-7d20a15f1219 https://doi.org/10.1016/j.dsr2.2017.02.011 https://pureadmin.uhi.ac.uk/ws/files/2403050/Brearley_et_al_DSR2_2017.pdf http://www.scopus.com/inward/record.url?scp=85016728320&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=85016728320&partnerID=8YFLogxK https://eprints.soton.ac.uk/406465/ |
genre |
Antarc* Antarctic Antarctic Ocean Antarctic Peninsula Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Ocean Antarctic Peninsula Sea ice |
op_source |
Brearley , J A , Meredith , M P , Naveira Garabato , A C , Venables , H J & Inall , M E 2017 , ' Controls on turbulent mixing on the West Antarctic Peninsula shelf ' , Deep-Sea Research Part II - Topical Studies in Oceanography , vol. 139 , pp. 18-30 . https://doi.org/10.1016/j.dsr2.2017.02.011 |
op_relation |
https://pure.uhi.ac.uk/en/publications/4a045d12-531a-422f-94df-7d20a15f1219 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.dsr2.2017.02.011 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
139 |
container_start_page |
18 |
op_container_end_page |
30 |
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1810489670307414016 |