The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes
We provide an updated estimate of the annual-mean, seasonal cycle and interannual variability of the transports and properties of the Weddell Sea Bottom Water (WSBW) plume in the northwestern Weddell Sea. For this we used a densely instrumented mooring array deployed across the continental slope bet...
Published in: | Journal of Geophysical Research: Oceans |
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American Geophysical Union (AGU)
2023
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Online Access: | https://epic.awi.de/id/eprint/59113/ https://epic.awi.de/id/eprint/59113/1/JGR%20Oceans%20-%202023%20-%20Llanillo%20-%20The%20Deep%25E2%2580%2590Water%20Plume%20in%20the%20Northwestern%20Weddell%20Sea%20%20Antarctica%20%20Mean%20State%20%20Seasonal%20Cycle.pdf https://doi.org/10.1029/2022jc019375 https://hdl.handle.net/10013/epic.613c8da3-30a6-4296-8d56-baa51d900696 |
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ftawi:oai:epic.awi.de:59113 2024-09-15T17:40:13+00:00 The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes Llanillo, Pedro J Kanzow, Torsten Janout, Markus A Rohardt, Gerd 2023-02 application/pdf https://epic.awi.de/id/eprint/59113/ https://epic.awi.de/id/eprint/59113/1/JGR%20Oceans%20-%202023%20-%20Llanillo%20-%20The%20Deep%25E2%2580%2590Water%20Plume%20in%20the%20Northwestern%20Weddell%20Sea%20%20Antarctica%20%20Mean%20State%20%20Seasonal%20Cycle.pdf https://doi.org/10.1029/2022jc019375 https://hdl.handle.net/10013/epic.613c8da3-30a6-4296-8d56-baa51d900696 unknown American Geophysical Union (AGU) https://epic.awi.de/id/eprint/59113/1/JGR%20Oceans%20-%202023%20-%20Llanillo%20-%20The%20Deep%25E2%2580%2590Water%20Plume%20in%20the%20Northwestern%20Weddell%20Sea%20%20Antarctica%20%20Mean%20State%20%20Seasonal%20Cycle.pdf Llanillo, P. J. orcid:0000-0002-9308-501X , Kanzow, T. , Janout, M. A. and Rohardt, G. (2023) The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes , Journal of Geophysical Research - Oceans, 128 (2) . doi:10.1029/2022jc019375 <https://doi.org/10.1029/2022jc019375> , hdl:10013/epic.613c8da3-30a6-4296-8d56-baa51d900696 EPIC3Journal of Geophysical Research - Oceans, American Geophysical Union (AGU), 128(2), ISSN: 2169-9275 Article isiRev 2023 ftawi https://doi.org/10.1029/2022jc019375 2024-09-02T14:07:29Z We provide an updated estimate of the annual-mean, seasonal cycle and interannual variability of the transports and properties of the Weddell Sea Bottom Water (WSBW) plume in the northwestern Weddell Sea. For this we used a densely instrumented mooring array deployed across the continental slope between January 2017 and January 2019. We found that the annual-mean WSBW transport is 3.4 ± 1.5 Sv, corresponding to a cross-section area of 35 km2 and a maximum thickness of 203 m. The annual mean transport-weighted properties of WSBW are −0.99°C (Θ), 34.803 g/kg (SA) and 28.44 kg/m3 (γn). The WSBW is characterized by 3 bottom-intensified velocity cores, which display seasonal variations in flow speed and transport different varieties of WSBW. The seasonal peak of WSBW transport and density is reached in May (4.7 Sv, 28.443 kg m−3) while the minimum values are observed in February (2.8 Sv, 28.435 kg m−3). The coldest WSBW is found between March and May, and the warmest between August and October. The density decrease of WSBW observed in the austral autumn of 2018 can be explained by warmer ambient waters being entrained during the formation of WSBW. This was enabled by the weakening of the along-shore winds associated with a positive Southern Annular Mode index, reinforced by a La Niña event in early 2018. The synchronous decrease of total WSBW transport and volume between September 2018 and February 2019 indicates a reduction in the export of the dense precursors of WSBW from the Weddell Sea continental shelf. Article in Journal/Newspaper Antarc* Antarctica Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Journal of Geophysical Research: Oceans 128 2 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
We provide an updated estimate of the annual-mean, seasonal cycle and interannual variability of the transports and properties of the Weddell Sea Bottom Water (WSBW) plume in the northwestern Weddell Sea. For this we used a densely instrumented mooring array deployed across the continental slope between January 2017 and January 2019. We found that the annual-mean WSBW transport is 3.4 ± 1.5 Sv, corresponding to a cross-section area of 35 km2 and a maximum thickness of 203 m. The annual mean transport-weighted properties of WSBW are −0.99°C (Θ), 34.803 g/kg (SA) and 28.44 kg/m3 (γn). The WSBW is characterized by 3 bottom-intensified velocity cores, which display seasonal variations in flow speed and transport different varieties of WSBW. The seasonal peak of WSBW transport and density is reached in May (4.7 Sv, 28.443 kg m−3) while the minimum values are observed in February (2.8 Sv, 28.435 kg m−3). The coldest WSBW is found between March and May, and the warmest between August and October. The density decrease of WSBW observed in the austral autumn of 2018 can be explained by warmer ambient waters being entrained during the formation of WSBW. This was enabled by the weakening of the along-shore winds associated with a positive Southern Annular Mode index, reinforced by a La Niña event in early 2018. The synchronous decrease of total WSBW transport and volume between September 2018 and February 2019 indicates a reduction in the export of the dense precursors of WSBW from the Weddell Sea continental shelf. |
format |
Article in Journal/Newspaper |
author |
Llanillo, Pedro J Kanzow, Torsten Janout, Markus A Rohardt, Gerd |
spellingShingle |
Llanillo, Pedro J Kanzow, Torsten Janout, Markus A Rohardt, Gerd The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes |
author_facet |
Llanillo, Pedro J Kanzow, Torsten Janout, Markus A Rohardt, Gerd |
author_sort |
Llanillo, Pedro J |
title |
The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes |
title_short |
The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes |
title_full |
The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes |
title_fullStr |
The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes |
title_full_unstemmed |
The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes |
title_sort |
deep‐water plume in the northwestern weddell sea, antarctica: mean state, seasonal cycle and interannual variability influenced by climate modes |
publisher |
American Geophysical Union (AGU) |
publishDate |
2023 |
url |
https://epic.awi.de/id/eprint/59113/ https://epic.awi.de/id/eprint/59113/1/JGR%20Oceans%20-%202023%20-%20Llanillo%20-%20The%20Deep%25E2%2580%2590Water%20Plume%20in%20the%20Northwestern%20Weddell%20Sea%20%20Antarctica%20%20Mean%20State%20%20Seasonal%20Cycle.pdf https://doi.org/10.1029/2022jc019375 https://hdl.handle.net/10013/epic.613c8da3-30a6-4296-8d56-baa51d900696 |
genre |
Antarc* Antarctica Weddell Sea |
genre_facet |
Antarc* Antarctica Weddell Sea |
op_source |
EPIC3Journal of Geophysical Research - Oceans, American Geophysical Union (AGU), 128(2), ISSN: 2169-9275 |
op_relation |
https://epic.awi.de/id/eprint/59113/1/JGR%20Oceans%20-%202023%20-%20Llanillo%20-%20The%20Deep%25E2%2580%2590Water%20Plume%20in%20the%20Northwestern%20Weddell%20Sea%20%20Antarctica%20%20Mean%20State%20%20Seasonal%20Cycle.pdf Llanillo, P. J. orcid:0000-0002-9308-501X , Kanzow, T. , Janout, M. A. and Rohardt, G. (2023) The Deep‐Water Plume in the Northwestern Weddell Sea, Antarctica: Mean State, Seasonal Cycle and Interannual Variability Influenced by Climate Modes , Journal of Geophysical Research - Oceans, 128 (2) . doi:10.1029/2022jc019375 <https://doi.org/10.1029/2022jc019375> , hdl:10013/epic.613c8da3-30a6-4296-8d56-baa51d900696 |
op_doi |
https://doi.org/10.1029/2022jc019375 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
128 |
container_issue |
2 |
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1810485678860926976 |