Wind-controlled export of Antarctic Bottom Water from the Weddell Sea
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 contr...
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American Geophysical Union
2010
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ftnerc:oai:nora.nerc.ac.uk:10541 2023-05-15T13:45:10+02:00 Wind-controlled export of Antarctic Bottom Water from the Weddell Sea Jullion, L. Jones, S.C. Naveira Garabato, A.C. Meredith, M. P. 2010 text http://nora.nerc.ac.uk/id/eprint/10541/ https://nora.nerc.ac.uk/id/eprint/10541/1/grl26971.pdf http://www.agu.org/journals/gl/gl1009/2010GL042822/2010GL042822.pdf en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/10541/1/grl26971.pdf Jullion, L.; Jones, S.C.; Naveira Garabato, A.C.; Meredith, M. P. orcid:0000-0002-7342-7756 . 2010 Wind-controlled export of Antarctic Bottom Water from the Weddell Sea. Geophysical Research Letters, 37 (9), L09609. 4, pp. https://doi.org/10.1029/2010GL042822 <https://doi.org/10.1029/2010GL042822> Marine Sciences Meteorology and Climatology Hydrology Publication - Article PeerReviewed 2010 ftnerc https://doi.org/10.1029/2010GL042822 2023-02-04T19:26:45Z 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. Citation: Jullion, L., S. C. Jones, A. C. Naveira Garabato, and M. P. Meredith (2010), Wind-controlled export of Antarctic Bottom Water from the Weddell Sea, Geophys. Res. Lett., 37, L09609, doi:10.1029/2010GL042822. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Scotia Sea Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Drake Passage Meredith ENVELOPE(67.717,67.717,-71.200,-71.200) Scotia Sea South Scotia Ridge ENVELOPE(-46.500,-46.500,-60.000,-60.000) Weddell Weddell Sea Geophysical Research Letters 37 9 n/a n/a |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Marine Sciences Meteorology and Climatology Hydrology |
spellingShingle |
Marine Sciences Meteorology and Climatology Hydrology Jullion, L. Jones, S.C. Naveira Garabato, A.C. Meredith, M. P. Wind-controlled export of Antarctic Bottom Water from the Weddell Sea |
topic_facet |
Marine Sciences Meteorology and Climatology Hydrology |
description |
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. Citation: Jullion, L., S. C. Jones, A. C. Naveira Garabato, and M. P. Meredith (2010), Wind-controlled export of Antarctic Bottom Water from the Weddell Sea, Geophys. Res. Lett., 37, L09609, doi:10.1029/2010GL042822. |
format |
Article in Journal/Newspaper |
author |
Jullion, L. Jones, S.C. Naveira Garabato, A.C. Meredith, M. P. |
author_facet |
Jullion, L. Jones, S.C. Naveira Garabato, A.C. Meredith, M. P. |
author_sort |
Jullion, L. |
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 |
American Geophysical Union |
publishDate |
2010 |
url |
http://nora.nerc.ac.uk/id/eprint/10541/ https://nora.nerc.ac.uk/id/eprint/10541/1/grl26971.pdf http://www.agu.org/journals/gl/gl1009/2010GL042822/2010GL042822.pdf |
long_lat |
ENVELOPE(67.717,67.717,-71.200,-71.200) ENVELOPE(-46.500,-46.500,-60.000,-60.000) |
geographic |
Antarctic Drake Passage Meredith Scotia Sea South Scotia Ridge Weddell Weddell Sea |
geographic_facet |
Antarctic Drake Passage Meredith Scotia Sea South Scotia Ridge Weddell Weddell Sea |
genre |
Antarc* Antarctic Drake Passage Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Drake Passage Scotia Sea Weddell Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/10541/1/grl26971.pdf Jullion, L.; Jones, S.C.; Naveira Garabato, A.C.; Meredith, M. P. orcid:0000-0002-7342-7756 . 2010 Wind-controlled export of Antarctic Bottom Water from the Weddell Sea. Geophysical Research Letters, 37 (9), L09609. 4, pp. https://doi.org/10.1029/2010GL042822 <https://doi.org/10.1029/2010GL042822> |
op_doi |
https://doi.org/10.1029/2010GL042822 |
container_title |
Geophysical Research Letters |
container_volume |
37 |
container_issue |
9 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766214159778709504 |