Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula
A multi-year, all-season time series of water column physical properties and sea ice conditions in Ryder Bay, at the western Antarctic Peninsula (WAP), is used to assess the effects on the ocean of varying ice cover. Reduced ice cover leads to increased mixing and heat loss in the winter. The reduct...
Published in: | Journal of Geophysical Research: Oceans |
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American Geophysical Union
2014
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ftnerc:oai:nora.nerc.ac.uk:503955 2023-05-15T13:48:08+02:00 Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula Venables, Hugh Meredith, Michael 2014-08-04 text http://nora.nerc.ac.uk/id/eprint/503955/ https://nora.nerc.ac.uk/id/eprint/503955/1/jgrc20834.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2013JC009669 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/503955/1/jgrc20834.pdf Venables, Hugh; Meredith, Michael orcid:0000-0002-7342-7756 . 2014 Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula. Journal of Geophysical Research: Oceans, 119 (8). 5323-5336. https://doi.org/10.1002/2013JC009669 <https://doi.org/10.1002/2013JC009669> Publication - Article PeerReviewed 2014 ftnerc https://doi.org/10.1002/2013JC009669 2023-02-04T19:38:10Z A multi-year, all-season time series of water column physical properties and sea ice conditions in Ryder Bay, at the western Antarctic Peninsula (WAP), is used to assess the effects on the ocean of varying ice cover. Reduced ice cover leads to increased mixing and heat loss in the winter. The reduction in stratification persists into the following summer, preconditioning the water column to a greater vertical extent of surface-driven mixing. This leads to an increased amount of heat from insolation being mixed down, affecting approximately the top 100m. The increased heat uptake in summer exceeds the heat lost the preceding winter, giving the initially counter-intuitive effect that enhanced winter cooling generates warmer temperatures in the following summer and autumn. This process is therefore a positive feedback on sea ice, as reduced sea ice leads to increased heat content in the ocean the following autumn. It also causes increased winter atmospheric temperatures due to the increased winter heat loss from the ocean. In the deeper part of the water column, heat and carbon stored in the Circumpolar Deep Water (CDW) layer are released by deep mixing events. At these depths, conditions are restored by advection and vertical mixing on multi-year timescales. In recent years, stronger deep mixing events in winter have led to a persistent reduction in CDW temperatures at the study site. Ocean glider data demonstrate the representativeness of these results across the wider region of Marguerite Bay, within which Ryder Bay is situated. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) Ryder ENVELOPE(-68.333,-68.333,-67.566,-67.566) Ryder Bay ENVELOPE(-68.333,-68.333,-67.567,-67.567) Journal of Geophysical Research: Oceans 119 8 5323 5336 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
A multi-year, all-season time series of water column physical properties and sea ice conditions in Ryder Bay, at the western Antarctic Peninsula (WAP), is used to assess the effects on the ocean of varying ice cover. Reduced ice cover leads to increased mixing and heat loss in the winter. The reduction in stratification persists into the following summer, preconditioning the water column to a greater vertical extent of surface-driven mixing. This leads to an increased amount of heat from insolation being mixed down, affecting approximately the top 100m. The increased heat uptake in summer exceeds the heat lost the preceding winter, giving the initially counter-intuitive effect that enhanced winter cooling generates warmer temperatures in the following summer and autumn. This process is therefore a positive feedback on sea ice, as reduced sea ice leads to increased heat content in the ocean the following autumn. It also causes increased winter atmospheric temperatures due to the increased winter heat loss from the ocean. In the deeper part of the water column, heat and carbon stored in the Circumpolar Deep Water (CDW) layer are released by deep mixing events. At these depths, conditions are restored by advection and vertical mixing on multi-year timescales. In recent years, stronger deep mixing events in winter have led to a persistent reduction in CDW temperatures at the study site. Ocean glider data demonstrate the representativeness of these results across the wider region of Marguerite Bay, within which Ryder Bay is situated. |
format |
Article in Journal/Newspaper |
author |
Venables, Hugh Meredith, Michael |
spellingShingle |
Venables, Hugh Meredith, Michael Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula |
author_facet |
Venables, Hugh Meredith, Michael |
author_sort |
Venables, Hugh |
title |
Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula |
title_short |
Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula |
title_full |
Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula |
title_fullStr |
Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula |
title_full_unstemmed |
Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula |
title_sort |
feedbacks between ice cover, ocean stratification, and heat content in ryder bay, western antarctic peninsula |
publisher |
American Geophysical Union |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/503955/ https://nora.nerc.ac.uk/id/eprint/503955/1/jgrc20834.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2013JC009669 |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) ENVELOPE(-68.333,-68.333,-67.566,-67.566) ENVELOPE(-68.333,-68.333,-67.567,-67.567) |
geographic |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay Ryder Ryder Bay |
geographic_facet |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay Ryder Ryder Bay |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/503955/1/jgrc20834.pdf Venables, Hugh; Meredith, Michael orcid:0000-0002-7342-7756 . 2014 Feedbacks between ice cover, ocean stratification, and heat content in Ryder Bay, western Antarctic Peninsula. Journal of Geophysical Research: Oceans, 119 (8). 5323-5336. https://doi.org/10.1002/2013JC009669 <https://doi.org/10.1002/2013JC009669> |
op_doi |
https://doi.org/10.1002/2013JC009669 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
119 |
container_issue |
8 |
container_start_page |
5323 |
op_container_end_page |
5336 |
_version_ |
1766248712494907392 |