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Conference Paper

Slowdown of Antarctic Bottom Water export driven by climatic wind and sea ice changes

Authors

Zhou,  Shenjie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Meijers,  Andrew
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Meredith,  Michael
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Abrahamsen,  Povl
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Holland,  Paul
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Silvano,  Alessandro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sallée,  Jean-baptiste
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Østerhus,  Svein
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Zhou, S., Meijers, A., Meredith, M., Abrahamsen, P., Holland, P., Silvano, A., Sallée, J.-b., Østerhus, S. (2023): Slowdown of Antarctic Bottom Water export driven by climatic wind and sea ice changes, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0821


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016660
Abstract
Antarctic Bottom Water (AABW) is a key water mass in the global overturning circulation, flooding most of the world ocean abyss and pivotal for deep ocean ventilation and oceanic heat and carbon exchanges on multi-decadal to millennial timescales. The Weddell Sea contributes nearly half of global AABW through Weddell Sea Deep Water (WSDW), which along with denser underlying Weddell Sea Bottom Water (WSBW), is formed on the continental shelves via complex processes that include sea ice production. Here we report a multi-decadal decline of WSBW volume in repeat hydrographic sections. A 30% reduction of WSBW volume since 1992 is found, with the most significant volume decrease seen in the densest WSBW classes. This is likely driven by a multi-decadal reduction in dense water production on the Weddell Sea continental shelf associated with a >40% decline in the sea ice formation rate there. The ice production decrease is driven by northerly wind trends, partly in response to a negative polarity of the Interdecadal Pacific Oscillation since the early 1990s, with variability from the Amundsen Sea Low superposed. These results reveal key influences on the export of waters to the Atlantic abyss and their sensitivity to large-scale, multi-decadal climate variability.