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 |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2017
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/511877/ https://nora.nerc.ac.uk/id/eprint/511877/1/Brearley%20-%20Controls%20on%20turbulent%20mixing%20on%20the%20West%20Antarctic%20Peninsula%20shelf%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0967064517300437 |
id |
ftnerc:oai:nora.nerc.ac.uk:511877 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:511877 2023-05-15T13:49:32+02:00 Controls on turbulent mixing on the West Antarctic Peninsula shelf Brearley, James Alexander Meredith, Michael P. Naveira Garabato, Alberto C. Venables, Hugh J. Inall, Mark E. 2017-05 text http://nora.nerc.ac.uk/id/eprint/511877/ https://nora.nerc.ac.uk/id/eprint/511877/1/Brearley%20-%20Controls%20on%20turbulent%20mixing%20on%20the%20West%20Antarctic%20Peninsula%20shelf%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0967064517300437 en eng Elsevier https://nora.nerc.ac.uk/id/eprint/511877/1/Brearley%20-%20Controls%20on%20turbulent%20mixing%20on%20the%20West%20Antarctic%20Peninsula%20shelf%20AAM.pdf Brearley, James Alexander orcid:0000-0003-3700-8017 Meredith, Michael P. orcid:0000-0002-7342-7756 Naveira Garabato, Alberto C.; Venables, Hugh J.; Inall, Mark E. 2017 Controls on turbulent mixing on the West Antarctic Peninsula shelf. Deep Sea Research II: Topical Studies in Oceanography, 139. 18-30. https://doi.org/10.1016/j.dsr2.2017.02.011 <https://doi.org/10.1016/j.dsr2.2017.02.011> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1016/j.dsr2.2017.02.011 2023-02-04T19:42:12Z 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 Peninsula Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Deep Sea Research Part II: Topical Studies in Oceanography 139 18 30 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
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, James Alexander Meredith, Michael P. Naveira Garabato, Alberto C. Venables, Hugh J. Inall, Mark E. |
spellingShingle |
Brearley, James Alexander Meredith, Michael P. Naveira Garabato, Alberto C. Venables, Hugh J. Inall, Mark E. Controls on turbulent mixing on the West Antarctic Peninsula shelf |
author_facet |
Brearley, James Alexander Meredith, Michael P. Naveira Garabato, Alberto C. Venables, Hugh J. Inall, Mark E. |
author_sort |
Brearley, James 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 |
publisher |
Elsevier |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/511877/ https://nora.nerc.ac.uk/id/eprint/511877/1/Brearley%20-%20Controls%20on%20turbulent%20mixing%20on%20the%20West%20Antarctic%20Peninsula%20shelf%20AAM.pdf http://www.sciencedirect.com/science/article/pii/S0967064517300437 |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/511877/1/Brearley%20-%20Controls%20on%20turbulent%20mixing%20on%20the%20West%20Antarctic%20Peninsula%20shelf%20AAM.pdf Brearley, James Alexander orcid:0000-0003-3700-8017 Meredith, Michael P. orcid:0000-0002-7342-7756 Naveira Garabato, Alberto C.; Venables, Hugh J.; Inall, Mark E. 2017 Controls on turbulent mixing on the West Antarctic Peninsula shelf. Deep Sea Research II: Topical Studies in Oceanography, 139. 18-30. https://doi.org/10.1016/j.dsr2.2017.02.011 <https://doi.org/10.1016/j.dsr2.2017.02.011> |
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 |
_version_ |
1766251509038710784 |