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  Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea

Silvano, A., Holland, P., Naughten, K., Dragomir, O., Dutrieux, P., Jenkins, A., Si, Y., Stewart, A., Peña Molino, B., Janzing, G., Dotto, T., Naveira Garabato, A. (2023): Baroclinic ocean response to climate forcing regulates decadal variability of ice-shelf melting in the Amundsen Sea, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0161

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016397 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016397_1
Genre: Conference Paper

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 Creators:
Silvano, Alessandro1, Author
Holland, Paul1, Author
Naughten, Kaitlin1, Author
Dragomir, Oana1, Author
Dutrieux, Pierre1, Author
Jenkins, Adrian1, Author
Si, Yidongfang1, Author
Stewart, Andrew1, Author
Peña Molino, Beatriz1, Author
Janzing, Gregor1, Author
Dotto, Tiago1, Author
Naveira Garabato, Alberto1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Warm ocean waters drive rapid ice-shelf melting in the Amundsen Sea. The ocean heat transport toward the ice shelves is associated with the Amundsen Undercurrent, a near-bottom current that flows eastward along the shelf break and transports warm waters onto the continental shelf via troughs. Here we use a regional ice-ocean model to show that, on decadal time scales, the undercurrent's variability is baroclinic (depth-dependent). Decadal ocean surface cooling in the tropical Pacific results in cyclonic wind anomalies over the Amundsen Sea. These wind anomalies drive a westward perturbation of the shelf-break surface flow and an eastward anomaly (strengthening) of the undercurrent, leading to increased ice-shelf melting. This contrasts with shorter time scales, for which surface current and undercurrent covary, a barotropic (depth-independent) behavior previously assumed to apply at all time scales. This suggests that interior ocean processes mediate the decadal ice-shelf response in the Amundsen Sea to climate forcing.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-0161
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -