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Title: Flux and composition of settling particles across the continental margin of the Gulf of Lion: the role of dense shelf water cascading
Author: Pasqual Mas, Catalina
Sanchez-Vidal, Anna
Zúñiga, Diana
Calafat Frau, Antoni
Canals Artigas, Miquel
Durrieu de Madron, Xavier
Puig, Pere
Heussner, Serge
Palanques Monteys, Albert
Delsaut, N.
Keywords: Marges continentals
Continental margins
Issue Date: 15-Jan-2010
Publisher: European Geosciences Union
Abstract: Settling particles were collected using sediment traps deployed along three transects in the Lacaze-Duthiers and Cap de Creus canyons and the adjacent southern open slope from October 2005 to October 2006. The settling material was analyzed to obtain total mass fluxes and main constituent contents (organic matter, opal, calcium carbonate, and siliciclastics). Cascades of dense shelf water from the continental shelf edge to the lower continental slope occurred from January to March 2006. They were traced through strong negative near-bottom temperature anomalies and increased current speeds, and generated two intense pulses of mass fluxes in January and March 2006. This oceanographic phenomenon appeared as the major physical forcing of settling particles at almost all stations, and caused both high seasonal variability in mass fluxes and important qualitative changes in settling material. Fluxes during the dense shelf water cascading (DSWC) event ranged from 90.1 g m(-2) d(-1) at the middle Cap de Creus canyon (1000 m) to 3.2 g m(-2) d(-1) at the canyon mouth (1900 m). Fractions of organic matter, opal and calcium carbonate components increased seaward, thus diminishing the siliciclastic fraction. Temporal variability of the major components was larger in the canyon mouth and open slope sites, due to the mixed impact of dense shelf water cascading processes and the pelagic biological production. Results indicate that the cascading event remobilized and homogenized large amounts of material down canyon and southwardly along the continental slope contributing to a better understanding of the off-shelf particle transport and the internal dynamics of DSWC events.
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It is part of: Biogeosciences, 2010, vol. 7, núm. 1, p. 217-231
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ISSN: 1726-4189
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)
Publicacions de projectes de recerca finançats per la UE

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