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  Mechanism of rapid along-boundary upwelling in a continental-slope canyon

Naveira Garabato, A., Spingys, C., Wynne-Cattanach, B., Alford, M., Polzin, K., Voet, G., Fernandez-Castro, B., Couto, N., Forryan, A., Drake, H., Mercier, H., Messias, M.-J., Ruan, X., Ferrari, R. (2023): Mechanism of rapid along-boundary upwelling in a continental-slope canyon, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4523

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020935 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020935_1
Genre: Conference Paper

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Naveira Garabato, Alberto1, Author
Spingys, Carl1, Author
Wynne-Cattanach, Bethan1, Author
Alford, Matthew1, Author
Polzin, Kurt1, Author
Voet, Gunnar1, Author
Fernandez-Castro, Bieito1, Author
Couto, Nicole1, Author
Forryan, Alexander1, Author
Drake, Henri1, Author
Mercier, Herle1, Author
Messias, Marie-Jose1, Author
Ruan, Xiaozhou1, Author
Ferrari, Raffaele1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Recent theoretical studies have hypothesized that deep-ocean upwelling may be primarily sustained by mixing processes within a thin bottom boundary layer (BBL) adjacent to the seafloor. However, this proposition appears at odds with several decades of observations of ocean turbulence, which suggest a pervasive intensification of mixing with depth conducive to deep-ocean downwelling. Here, we reconcile such intensification with the newly-proposed paradigm of BBL-focussed upwelling in the context of a typical continental-slope canyon, in which very rapid upwelling is observed. We show that upwelling along the canyon stems from episodic cells of convective turbulent mixing up to 250 m in height, generated by tidal currents sweeping up- and down-canyon. As drag against the seabed decelerates the currents’ base, their upper layers convey dense waters over slower-flowing lighter waters below, causing the dense waters to convectively mix, lighten and upwell. We discuss how this upwelling mechanism is likely to be of wider representativeness, lending support to the view that deep-ocean upwelling may predominantly occur along the ocean’s sloping boundaries.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-4523
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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
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