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Title: Diapycnal nutrient fluxes on the northern boundary of Cape Ghir upwelling region
Authors: Arcos-Pulido, M.
Rodríguez-Santana, A. 
Emelianov, M.
Paka, V.
Arístegui, J. 
Benavides, M.
Sangrá Inciarte, Pablo 
Machín, F. 
García-Weil, L. 
Estrada-Allis, S. 
UNESCO Clasification: 2510 Oceanografía
Keywords: Eddy diffusivity
Diapycnal mixing
Nutrient fluxes
NW African upwelling
Cape Ghir
Issue Date: 2014
Publisher: 0967-0637
Project: Campaña Oceanográfica Promeca-2010 
Procesos de Mezcla en la Cuenca Canaria: Corriente de Canarias y Sistema de Afloramiento Del Noroeste Africano. 
Intercambio Plataforma-Oceano en El Ecosistema Marino de Las Islas Canarias-Peninsula Iberica (Caibex):Afloramiento de Cabo Guir 
Journal: Deep-Sea Research Part I: Oceanographic Research Papers 
Abstract: In this study we estimate diffusive nutrient fluxes in the northern region of Cape Ghir upwelling system (Northwest Africa) during autumn 2010. The contribution of two co-existing vertical mixing processes (turbulence and salt fingers) is estimated through micro- and fine-structure scale observations. The boundary between coastal upwelling and open ocean waters becomes apparent when nitrate is used as a tracer. Below the mixed layer (56.15±15.56 m), the water column is favorable to the occurrence of a salt finger regime. Vertical eddy diffusivity for salt (Ks) at the reference layer (57.86±8.51 m, CI 95%) was 3×10−5 (±1.89×10−9, CI 95%) m2 s−1. Average diapycnal fluxes indicate that there was a deficit in phosphate supply to the surface layer (6.61×10−4 mmol m−2 d−1), while these fluxes were 0.09 and 0.03 mmol m−2 d−1 for nitrate and silicate, respectively. There is a need to conduct more studies to obtain accurate estimations of vertical eddy diffusivity and nutrient supply in complex transitional zones, like Cape Ghir. This will provide us with information about salt and nutrients exchange in onshore–offshore zones.
ISSN: 0967-0637
DOI: 10.1016/j.dsr.2013.10.010
Source: Deep-Sea Research Part I: Oceanographic Research Papers [ISSN 0967-0637], v. 84, p. 100-109
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