Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/51378
Título: Seasonality of surface water properties and particle flux along a productivity gradient off NW Africa
Autores/as: Neuer, Susanne
Freudenthal, Tim
Davenport, Robert
Llinás Gonzalez, Octavio 
Rueda, Mariá José 
Clasificación UNESCO: 2510 Oceanografía
Fecha de publicación: 2002
Editor/a: 0967-0645
Publicación seriada: Deep-Sea Research Part II: Topical Studies in Oceanography 
Resumen: Three stations along a productivity gradient north of the Canary Islands were investigated for surface-water properties, particle flux, and composition (biogenic and lithogenic components, and stable nitrogen isotope composition, δ15N) and export production. Investigation sites along the east–west transect off the NW African upwelling margin included the European Station for Time-Series in the Ocean, Canary Islands (ESTOC), one location contiguous to the NW African upwelling zone in the Eastern Boundary Current (EBC) and one station north of the island La Palma (LP). The seasonality of surface-water properties along the transect was mainly influenced by the winter cooling and simultaneous phytoplankton maximum and, in addition at EBC, by nearby upwelling. Accordingly, particle flux and composition along the transect were closely linked to the winter bloom sedimentation and upwelling related enhanced plankton biomass stemming from the primary upwelling and the Cape Yubi filament at EBC. During all seasons, particle flux was highest at EBC and had the highest contribution of biogenic opal and lithogenic components, and the lowest δ15N compared to the offshore stations. But contrary to what would be expected from the productivity gradient, particle flux did not decrease from ESTOC to LP. Below the upper several hundred meters, particle flux was enhanced by additional particle input along the entire transect, manifested by an increase of flux with depth and lower δ15N values. We offer a scenario in which intermediate nepheloid layers originating from the primary upwelling as well as particle dispersion from upwelling filaments, mainly the Cape Ghir filament, impact on the trap stations as far as 700 km into the open ocean. This study contributes to our understanding of the poorly resolved biogeochemical transition between the productive shelf and subtropical gyre provinces.
URI: http://hdl.handle.net/10553/51378
ISSN: 0967-0645
DOI: 10.1016/S0967-0645(02)00098-X
Fuente: Deep-Sea Research Part II: Topical Studies in Oceanography [ISSN 0967-0645], v. 49, p. 3561-3576
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