Water mass transformation variability in the Weddell Sea in ocean reanalyses
This study investigates the variability of water mass transformation (WMT) within the Weddell Gyre (WG). The WG serves as a pivotal site for the Meridional Overturning Circulation (MOC) and ocean ventilation because it is the primary origin of the largest volume of water mass in the global ocean: An...
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Copernicus Publications
2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00065742 2023-05-15T14:13:48+02:00 Water mass transformation variability in the Weddell Sea in ocean reanalyses Bailey, Shanice T. Jones, C. Spencer Abernathey, Ryan P. Gordon, Arnold L. Yuan, Xiaojun 2023-04 electronic https://doi.org/10.5194/os-19-381-2023 https://noa.gwlb.de/receive/cop_mods_00065742 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064256/os-19-381-2023.pdf https://os.copernicus.org/articles/19/381/2023/os-19-381-2023.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-19-381-2023 https://noa.gwlb.de/receive/cop_mods_00065742 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064256/os-19-381-2023.pdf https://os.copernicus.org/articles/19/381/2023/os-19-381-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/os-19-381-2023 2023-04-09T23:16:54Z This study investigates the variability of water mass transformation (WMT) within the Weddell Gyre (WG). The WG serves as a pivotal site for the Meridional Overturning Circulation (MOC) and ocean ventilation because it is the primary origin of the largest volume of water mass in the global ocean: Antarctic Bottom Water (AABW). Recent mooring data suggest substantial seasonal and interannual variability of AABW properties exiting the WG, and studies have linked the variability to the large-scale climate forcings affecting wind stress in the WG region. However, the specific thermodynamic mechanisms that link variability in surface forcings to variability in water mass transformations and AABW export remain unclear. This study explores how current state-of-the-art data-assimilating ocean reanalyses can help fill the gaps in our understanding of the thermodynamic drivers of AABW variability in the WG via WMT volume budgets derived from Walin's classic WMT framework. The three ocean reanalyses used are the following: Estimating the Circulation and Climate of the Ocean state estimate (ECCOv4), Southern Ocean State Estimate (SOSE) and Simple Ocean Data Assimilation (SODA). From the model outputs, we diagnose a closed form of the water mass budget for AABW that explicitly accounts for transport across the WG boundary, surface forcing, interior mixing and numerical mixing. We examine the annual mean climatology of the WMT budget terms, the seasonal climatology and finally the interannual variability. Our finding suggests that the relatively coarse resolution of these models did not realistically capture AABW formation, export and variability. In ECCO and SOSE, we see strong interannual variability in AABW volume budget. In SOSE, we find an accelerating loss of AABW during 2005–2010, driven largely by interior mixing and changes in surface salt fluxes. ECCO shows a similar trend during a 4-year time period starting in late 2007 but also reveals such trends to be part of interannual variability over a much longer time ... Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Weddell Sea Niedersächsisches Online-Archiv NOA Antarctic Southern Ocean Weddell Weddell Sea Ocean Science 19 2 381 402 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Bailey, Shanice T. Jones, C. Spencer Abernathey, Ryan P. Gordon, Arnold L. Yuan, Xiaojun Water mass transformation variability in the Weddell Sea in ocean reanalyses |
topic_facet |
article Verlagsveröffentlichung |
description |
This study investigates the variability of water mass transformation (WMT) within the Weddell Gyre (WG). The WG serves as a pivotal site for the Meridional Overturning Circulation (MOC) and ocean ventilation because it is the primary origin of the largest volume of water mass in the global ocean: Antarctic Bottom Water (AABW). Recent mooring data suggest substantial seasonal and interannual variability of AABW properties exiting the WG, and studies have linked the variability to the large-scale climate forcings affecting wind stress in the WG region. However, the specific thermodynamic mechanisms that link variability in surface forcings to variability in water mass transformations and AABW export remain unclear. This study explores how current state-of-the-art data-assimilating ocean reanalyses can help fill the gaps in our understanding of the thermodynamic drivers of AABW variability in the WG via WMT volume budgets derived from Walin's classic WMT framework. The three ocean reanalyses used are the following: Estimating the Circulation and Climate of the Ocean state estimate (ECCOv4), Southern Ocean State Estimate (SOSE) and Simple Ocean Data Assimilation (SODA). From the model outputs, we diagnose a closed form of the water mass budget for AABW that explicitly accounts for transport across the WG boundary, surface forcing, interior mixing and numerical mixing. We examine the annual mean climatology of the WMT budget terms, the seasonal climatology and finally the interannual variability. Our finding suggests that the relatively coarse resolution of these models did not realistically capture AABW formation, export and variability. In ECCO and SOSE, we see strong interannual variability in AABW volume budget. In SOSE, we find an accelerating loss of AABW during 2005–2010, driven largely by interior mixing and changes in surface salt fluxes. ECCO shows a similar trend during a 4-year time period starting in late 2007 but also reveals such trends to be part of interannual variability over a much longer time ... |
format |
Article in Journal/Newspaper |
author |
Bailey, Shanice T. Jones, C. Spencer Abernathey, Ryan P. Gordon, Arnold L. Yuan, Xiaojun |
author_facet |
Bailey, Shanice T. Jones, C. Spencer Abernathey, Ryan P. Gordon, Arnold L. Yuan, Xiaojun |
author_sort |
Bailey, Shanice T. |
title |
Water mass transformation variability in the Weddell Sea in ocean reanalyses |
title_short |
Water mass transformation variability in the Weddell Sea in ocean reanalyses |
title_full |
Water mass transformation variability in the Weddell Sea in ocean reanalyses |
title_fullStr |
Water mass transformation variability in the Weddell Sea in ocean reanalyses |
title_full_unstemmed |
Water mass transformation variability in the Weddell Sea in ocean reanalyses |
title_sort |
water mass transformation variability in the weddell sea in ocean reanalyses |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/os-19-381-2023 https://noa.gwlb.de/receive/cop_mods_00065742 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064256/os-19-381-2023.pdf https://os.copernicus.org/articles/19/381/2023/os-19-381-2023.pdf |
geographic |
Antarctic Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Southern Ocean Weddell Sea |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-19-381-2023 https://noa.gwlb.de/receive/cop_mods_00065742 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064256/os-19-381-2023.pdf https://os.copernicus.org/articles/19/381/2023/os-19-381-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/os-19-381-2023 |
container_title |
Ocean Science |
container_volume |
19 |
container_issue |
2 |
container_start_page |
381 |
op_container_end_page |
402 |
_version_ |
1766286333669539840 |