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Antarctic Bottom Water salinity response to increasing ice sheet melting

Urheber*innen

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

Lee,  Sang-Ki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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

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

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Zitation

Aguiar, W., Lee, S.-K., Lopez, H., Dong, S., Seroussi, H., Jones, D. (2023): Antarctic Bottom Water salinity response to increasing ice sheet melting, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3783


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020762
Zusammenfassung
Ice sheet melting into the Southern Ocean increases the upper ocean stratification and sea ice production, and thus can change the formation and properties of the Antarctic Bottom Water (AABW). Indeed, both the AABW freshening, and sea ice expansion have been observed in the Southern Ocean from the late 1980s until 2014, raising the question as to what extent increasing ice sheet melting could explain the observed patterns. However, it is challenging to address this question using observations due to the scarcity of direct observations along the Antarctic shelf and slope. Until recently, most ocean models could not form AABW efficiently along the Antarctic shelf either, precluding further investigation. In this study, we use a global ocean & sea ice model to explore how increasing ice sheet melting can alter the AABW properties and sea ice production Here, we explore three observation-based ice sheet melting scenarios based on historical observations (i.e., 5, 12, and 18%) for the historical period of 1958-2017. Our model results indicate a 12% increase in ice sheet melting may lead to a freshening of AABW at a rate similar to that observed since the early 1980s. This suggests that the observed AABW freshening could be driven by the increasing Antarctic meltwater discharge. Sea ice did not show any robust response to any of the three ice sheet melting scenarios.