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Northern Current variability and its impact on the Blanes Canyon circulation: a numerical study

Northern Current variability and its impact on the Blanes Canyon circulation: a numerical study
Northern Current variability and its impact on the Blanes Canyon circulation: a numerical study
A high-resolution (?1.2 km) 3D numerical model was used to analyze the interaction of the Northern Current (a right-bounded flow) with the Blanes submarine canyon (BC, NW Mediterranean). Although it refers to a climatological simulation the model properly suites our purpose since it simulates the Northern Current (NC) mesoscale variability, as well as its seasonal variability. Model results were validated with satellite sea surface temperature and current-meter data. The simulated NC tends to be faster and deeper in winter, and slower and shallower in summer. According to our results, NC meanders and eddies are recurrent in the BC area and produce highly fluctuating three-dimensional circulation patterns within the canyon. We found that NC meanders and anticyclonic eddies propagating along the current pathway tend to be deep and, consequently, their effects extend down to the deeper part of the BC. We also found that the meandering of the NC plays a key role in enhancing vertical motions inside the BC. Upwelling and downwelling events occurring on timescales of 4–20 days are associated with NC meanders crests and troughs passing over the BC. Net upwelling/downwelling events are accordingly influenced by the NC seasonality. They are more predominant in winter, while damped in summer. Our results show the importance of NC meanders in creating local net upwelling/downwelling and strengthen the evidence that continuous right-bounded (downwelling favorable) flows can also produce net upwelling inside submarine canyons.
0079-6611
61 - 70
Ahumada-Sempoal, M.-A.
fffe504f-a17c-4d2e-87fb-4a7c7a1400ff
Flexas, M.M.
6dd23f03-2f6a-489e-9155-508e9c2569ef
Bernardello, R.
7db9abe7-7079-4f14-8397-6371d96e2420
Bahamon, N.
86c2a8d7-5427-4007-95ad-d0efaf606918
Cruzado, A.
c1e91329-d53b-4302-861f-53b247f6ea1f
Ahumada-Sempoal, M.-A.
fffe504f-a17c-4d2e-87fb-4a7c7a1400ff
Flexas, M.M.
6dd23f03-2f6a-489e-9155-508e9c2569ef
Bernardello, R.
7db9abe7-7079-4f14-8397-6371d96e2420
Bahamon, N.
86c2a8d7-5427-4007-95ad-d0efaf606918
Cruzado, A.
c1e91329-d53b-4302-861f-53b247f6ea1f

Ahumada-Sempoal, M.-A., Flexas, M.M., Bernardello, R., Bahamon, N. and Cruzado, A. (2013) Northern Current variability and its impact on the Blanes Canyon circulation: a numerical study. Progress in Oceanography, 118, 61 - 70. (doi:10.1016/j.pocean.2013.07.030).

Record type: Article

Abstract

A high-resolution (?1.2 km) 3D numerical model was used to analyze the interaction of the Northern Current (a right-bounded flow) with the Blanes submarine canyon (BC, NW Mediterranean). Although it refers to a climatological simulation the model properly suites our purpose since it simulates the Northern Current (NC) mesoscale variability, as well as its seasonal variability. Model results were validated with satellite sea surface temperature and current-meter data. The simulated NC tends to be faster and deeper in winter, and slower and shallower in summer. According to our results, NC meanders and eddies are recurrent in the BC area and produce highly fluctuating three-dimensional circulation patterns within the canyon. We found that NC meanders and anticyclonic eddies propagating along the current pathway tend to be deep and, consequently, their effects extend down to the deeper part of the BC. We also found that the meandering of the NC plays a key role in enhancing vertical motions inside the BC. Upwelling and downwelling events occurring on timescales of 4–20 days are associated with NC meanders crests and troughs passing over the BC. Net upwelling/downwelling events are accordingly influenced by the NC seasonality. They are more predominant in winter, while damped in summer. Our results show the importance of NC meanders in creating local net upwelling/downwelling and strengthen the evidence that continuous right-bounded (downwelling favorable) flows can also produce net upwelling inside submarine canyons.

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More information

Published date: November 2013
Additional Information: Integrated study of a deep submarine canyon and adjacent open slopes in the Western Mediterranean Sea: an essential habitat
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 372712
URI: https://eprints.soton.ac.uk/id/eprint/372712
ISSN: 0079-6611
PURE UUID: 5dae1a4a-9b28-4b06-8b55-03e2e08904cd

Catalogue record

Date deposited: 15 Dec 2014 15:18
Last modified: 17 Jul 2017 21:39

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