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Conference Paper

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

Authors

Naveira Garabato,  Alberto
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

Wynne-Cattanach,  Bethan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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

Fernandez-Castro,  Bieito
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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

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

Messias,  Marie-Jose
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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Citation

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


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020935
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.