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  Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic

Worthington, E., Johns, W., Bower, A., de Jong, F., Karstensen, J., Pickart, R., Dilmahamod, F., Fried, N., Koman, G., Pacini, A., Hiang, J. (2023): Updating Lower North Atlantic Deep Water transports in the sub-polar North Atlantic, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1233

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017402 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017402_3
Genre: Conference Paper

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 Creators:
Worthington, Emma1, Author
Johns, William1, Author
Bower, Amy1, Author
de Jong, Femke1, Author
Karstensen, Johannes1, Author
Pickart, Robert1, Author
Dilmahamod, Fehmi1, Author
Fried, Nora1, Author
Koman, Gregory1, Author
Pacini, Astrid1, Author
Hiang, Jie1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The densest waters in the deep limb of the Atlantic meridional overturning circulation (AMOC) consist of overflow waters from the Nordic Seas: Denmark Strait Overflow Water (DSOW) and Iceland-Scotland Overflow Water (ISOW). These overflow waters are then substantially modified along their pathways by the entrainment of overlying intermediate waters and are eventually exported from the sub-polar gyre as Lower North Atlantic Deep Water. Since 2014, the OSNAP array has provided new insights into the sub-polar overturning circulation, including key boundary current arrays deployed across the Reykjanes Ridge, off East and West Greenland, and along the western side of the Labrador Sea. Here, using the OSNAP array data between 2014 and 2020, we quantify the mean transports of overflow waters along the deep boundary pathways, as well as recirculation within the Labrador Sea and Irminger Basin. Changes in the water properties of ISOW and DSOW as they advect around the deep subpolar gyre are also assessed. We further examine the traditional use of potential density of 27.88 kg/m3 as the interface between ISOW and DSOW, and assess whether water mass boundary definitions need to change with increasing distance and entrainment along the deep circulation pathways.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1233
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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: -