Wind‐controlled export of Antarctic Bottom Water from the Weddell Sea
International audience [1] Recent studies suggest that the variability in Antarctic Bottom Water (AABW) properties in the Scotia Sea on time scales up to decadal may be linked to changes in the baroclinicity of the Weddell gyre, with vertical variations in the density structure at the gyre's no...
Published in: | Geophysical Research Letters |
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Online Access: | https://hal.science/hal-01255769 https://hal.science/hal-01255769/document https://hal.science/hal-01255769/file/2010GL042822.pdf https://doi.org/10.1029/2010GL042822 |
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ftinsu:oai:HAL:hal-01255769v1 2023-12-31T09:59:36+01:00 Wind‐controlled export of Antarctic Bottom Water from the Weddell Sea Jullion, Loïc Jones, Sam Naveira Garabato, Alberto C. Meredith, Michael P. Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Nathional Oceanography Centre University of Southampton British Antarctic Survey (BAS) Natural Environment Research Council (NERC) 2010 https://hal.science/hal-01255769 https://hal.science/hal-01255769/document https://hal.science/hal-01255769/file/2010GL042822.pdf https://doi.org/10.1029/2010GL042822 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2010GL042822 hal-01255769 https://hal.science/hal-01255769 https://hal.science/hal-01255769/document https://hal.science/hal-01255769/file/2010GL042822.pdf doi:10.1029/2010GL042822 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-01255769 Geophysical Research Letters, 2010, Geophysical Research Letters, 37 (9), pp.L09609. ⟨10.1029/2010GL042822⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2010 ftinsu https://doi.org/10.1029/2010GL042822 2023-12-06T17:27:27Z International audience [1] Recent studies suggest that the variability in Antarctic Bottom Water (AABW) properties in the Scotia Sea on time scales up to decadal may be linked to changes in the baroclinicity of the Weddell gyre, with vertical variations in the density structure at the gyre's northern edge acting to control the export of AABW over the South Scotia Ridge and toward the mid‐latitude South Atlantic. We test this hypothesis by analysing the AABW properties in fifteen occupations of the SR1b hydrographic section (1993–2009) in eastern Drake Passage alongside possible forcings as derived from atmospheric reanalysis data. We show that variability in the wind stress over the Weddell gyre leads changes in AABW properties in the SR1b section by approximately five months. The sign of the lagged correlation is consistent with the notion of the AABW export from the Weddell Sea being controlled by the gyre's baroclinic adjustment to wind forcing on time scales of several months. Variability in the regional winds is found to be closely linked to the Southern Annular Mode (SAM). These results suggest that there may be a causal relationship between the SAM's positive tendency observed in recent decades and the subsequent warming of AABW detected across much of the Atlantic Ocean. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Scotia Sea Weddell Sea Institut national des sciences de l'Univers: HAL-INSU Geophysical Research Letters 37 9 n/a n/a |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Jullion, Loïc Jones, Sam Naveira Garabato, Alberto C. Meredith, Michael P. Wind‐controlled export of Antarctic Bottom Water from the Weddell Sea |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience [1] Recent studies suggest that the variability in Antarctic Bottom Water (AABW) properties in the Scotia Sea on time scales up to decadal may be linked to changes in the baroclinicity of the Weddell gyre, with vertical variations in the density structure at the gyre's northern edge acting to control the export of AABW over the South Scotia Ridge and toward the mid‐latitude South Atlantic. We test this hypothesis by analysing the AABW properties in fifteen occupations of the SR1b hydrographic section (1993–2009) in eastern Drake Passage alongside possible forcings as derived from atmospheric reanalysis data. We show that variability in the wind stress over the Weddell gyre leads changes in AABW properties in the SR1b section by approximately five months. The sign of the lagged correlation is consistent with the notion of the AABW export from the Weddell Sea being controlled by the gyre's baroclinic adjustment to wind forcing on time scales of several months. Variability in the regional winds is found to be closely linked to the Southern Annular Mode (SAM). These results suggest that there may be a causal relationship between the SAM's positive tendency observed in recent decades and the subsequent warming of AABW detected across much of the Atlantic Ocean. |
author2 |
Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) Nathional Oceanography Centre University of Southampton British Antarctic Survey (BAS) Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Jullion, Loïc Jones, Sam Naveira Garabato, Alberto C. Meredith, Michael P. |
author_facet |
Jullion, Loïc Jones, Sam Naveira Garabato, Alberto C. Meredith, Michael P. |
author_sort |
Jullion, Loïc |
title |
Wind‐controlled export of Antarctic Bottom Water from the Weddell Sea |
title_short |
Wind‐controlled export of Antarctic Bottom Water from the Weddell Sea |
title_full |
Wind‐controlled export of Antarctic Bottom Water from the Weddell Sea |
title_fullStr |
Wind‐controlled export of Antarctic Bottom Water from the Weddell Sea |
title_full_unstemmed |
Wind‐controlled export of Antarctic Bottom Water from the Weddell Sea |
title_sort |
wind‐controlled export of antarctic bottom water from the weddell sea |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/hal-01255769 https://hal.science/hal-01255769/document https://hal.science/hal-01255769/file/2010GL042822.pdf https://doi.org/10.1029/2010GL042822 |
genre |
Antarc* Antarctic Drake Passage Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Drake Passage Scotia Sea Weddell Sea |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-01255769 Geophysical Research Letters, 2010, Geophysical Research Letters, 37 (9), pp.L09609. ⟨10.1029/2010GL042822⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2010GL042822 hal-01255769 https://hal.science/hal-01255769 https://hal.science/hal-01255769/document https://hal.science/hal-01255769/file/2010GL042822.pdf doi:10.1029/2010GL042822 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2010GL042822 |
container_title |
Geophysical Research Letters |
container_volume |
37 |
container_issue |
9 |
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n/a |
op_container_end_page |
n/a |
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1786839996317040640 |