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Ocean-shelf exchange: a north-west European perspective

Authors

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

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

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

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

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

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

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

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

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

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

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

Porter,  Marie
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;

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Citation

Huthnance, J., Hopkins, J., Berx, B., Dale, A., Holt, J., Hosegood, P., Inall, M., Jones, S., Loveday, B., Miller, P., Polton, J., Porter, M., Spingys, C. (2023): Ocean-shelf exchange: a north-west European perspective, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3215


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020410
Abstract
Transports across the continental shelf edge enhance shelf-sea production, remove atmospheric carbon and imply an active boundary to ocean circulation. Overall transports across the varied shelf edge from south-west of Britain to north of Scotland are estimated (from a variety of measurements and models) as several m2s−1. This large value results from variable strong wind-forced and tidal currents and along-slope flow.Even a globally typical 1 m2s−1 across an estimated 5x105 km of shelf edge amounts to 500 Sv; large compared with oceanic transports and potentially important to shelf-sea and adjacent oceanic budgets. However, exchanges with periods ∼ one day or less may be effective only for water properties that evolve on such short time-scales. Thus transports’ significance depends on distinctive properties of the water, or its contents, and on internal shelf-sea circulation affecting further transport. Transports across the NW European shelf edge enable its disproportionately strong CO2 “pump”.The complex context, and small scales of numerous processes enabling cross-slope transports, imply a need for models. Measurements remain limited in extent and duration, but widely varied contexts, particular conditions, events, processes and behaviours are now available for model validation. Variability still renders observations insufficient for stable estimates of transports and exchanges, especially if partitioned by sector and season; indeed, there may be significant inter-annual differences. Validated fine-resolution models give the best prospect of spatial and temporal coverage and of estimating shelf-sea sensitivities to the adjacent ocean.