Entrainment-driven modulation of Southern Ocean mixed layer properties and sea ice variability in CMIP5 models
The evolution of the upper Southern Ocean hydrographic structure in response to the representative concentration pathways 4.5 (RCP 4.5) forcing scenario is analyzed using model data drawn from the coupled model intercomparison project phase 5 (CMIP5) archive. A robust freshening trend is evident, as...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | http://hdl.handle.net/2078.1/154432 https://doi.org/10.1002/jgrc.20226 |
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:154432 2024-05-12T08:10:52+00:00 Entrainment-driven modulation of Southern Ocean mixed layer properties and sea ice variability in CMIP5 models Close, Sally Goosse, Hugues UCL - SST/ELI/ELIC - Earth & Climate 2013 http://hdl.handle.net/2078.1/154432 https://doi.org/10.1002/jgrc.20226 eng eng boreal:154432 http://hdl.handle.net/2078.1/154432 doi:10.1002/jgrc.20226 urn:ISSN:2169-9291 info:eu-repo/semantics/restrictedAccess Journal of Geophysical Research Oceans, Vol. 118, p. 2811-2827 (2013) CECI: CISM 1443 info:eu-repo/semantics/article 2013 ftunistlouisbrus https://doi.org/10.1002/jgrc.20226 2024-04-18T17:52:25Z The evolution of the upper Southern Ocean hydrographic structure in response to the representative concentration pathways 4.5 (RCP 4.5) forcing scenario is analyzed using model data drawn from the coupled model intercomparison project phase 5 (CMIP5) archive. A robust freshening trend is evident, associated with an increase in stratification and decoupling of the upper ocean as the mixed layer gains buoyancy at a faster rate than the underlying ocean. The magnitudes of the individual terms of the salinity and heat budgets are evaluated. Convection-driven entrainment from the thermocline into the mixed layer is found to play a significant role in modulating the mixed layer salinity, whilst the heat budget of the mixed layer is dominated by a primary balance between atmospheric warming and the entrainment-modulated supply of oceanic heat from below the mixed layer. The relationship between oceanic heat storage below the mixed layer, ice thickness and atmospheric temperature is investigated, and a very disparate response noted amongst the models considered here. Based on this analysis, we hypothesize that the balance between the entrainment-modulated supply of oceanic heat from below the mixed layer and the heat supplied by the atmosphere may play an important role in determining the simulated sea ice variability. Article in Journal/Newspaper Sea ice Southern Ocean DIAL@USL-B (Université Saint-Louis, Bruxelles) Southern Ocean Journal of Geophysical Research: Oceans 118 6 2811 2827 |
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Open Polar |
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DIAL@USL-B (Université Saint-Louis, Bruxelles) |
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ftunistlouisbrus |
language |
English |
topic |
CECI: CISM 1443 |
spellingShingle |
CECI: CISM 1443 Close, Sally Goosse, Hugues Entrainment-driven modulation of Southern Ocean mixed layer properties and sea ice variability in CMIP5 models |
topic_facet |
CECI: CISM 1443 |
description |
The evolution of the upper Southern Ocean hydrographic structure in response to the representative concentration pathways 4.5 (RCP 4.5) forcing scenario is analyzed using model data drawn from the coupled model intercomparison project phase 5 (CMIP5) archive. A robust freshening trend is evident, associated with an increase in stratification and decoupling of the upper ocean as the mixed layer gains buoyancy at a faster rate than the underlying ocean. The magnitudes of the individual terms of the salinity and heat budgets are evaluated. Convection-driven entrainment from the thermocline into the mixed layer is found to play a significant role in modulating the mixed layer salinity, whilst the heat budget of the mixed layer is dominated by a primary balance between atmospheric warming and the entrainment-modulated supply of oceanic heat from below the mixed layer. The relationship between oceanic heat storage below the mixed layer, ice thickness and atmospheric temperature is investigated, and a very disparate response noted amongst the models considered here. Based on this analysis, we hypothesize that the balance between the entrainment-modulated supply of oceanic heat from below the mixed layer and the heat supplied by the atmosphere may play an important role in determining the simulated sea ice variability. |
author2 |
UCL - SST/ELI/ELIC - Earth & Climate |
format |
Article in Journal/Newspaper |
author |
Close, Sally Goosse, Hugues |
author_facet |
Close, Sally Goosse, Hugues |
author_sort |
Close, Sally |
title |
Entrainment-driven modulation of Southern Ocean mixed layer properties and sea ice variability in CMIP5 models |
title_short |
Entrainment-driven modulation of Southern Ocean mixed layer properties and sea ice variability in CMIP5 models |
title_full |
Entrainment-driven modulation of Southern Ocean mixed layer properties and sea ice variability in CMIP5 models |
title_fullStr |
Entrainment-driven modulation of Southern Ocean mixed layer properties and sea ice variability in CMIP5 models |
title_full_unstemmed |
Entrainment-driven modulation of Southern Ocean mixed layer properties and sea ice variability in CMIP5 models |
title_sort |
entrainment-driven modulation of southern ocean mixed layer properties and sea ice variability in cmip5 models |
publishDate |
2013 |
url |
http://hdl.handle.net/2078.1/154432 https://doi.org/10.1002/jgrc.20226 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
Journal of Geophysical Research Oceans, Vol. 118, p. 2811-2827 (2013) |
op_relation |
boreal:154432 http://hdl.handle.net/2078.1/154432 doi:10.1002/jgrc.20226 urn:ISSN:2169-9291 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/jgrc.20226 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
6 |
container_start_page |
2811 |
op_container_end_page |
2827 |
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1798854402517237760 |