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Impact of dense shelf water cascading on the transfer of organic matter to the deep western Mediterranean basin

2008; American Geophysical Union; Volume: 35; Issue: 5 Linguagem: Inglês

10.1029/2007gl032825

1944-8007

Anna Sánchez‐Vidal, Catalina Pasqual, Philippe Kerhervé, Antoni Calafat, Serge Heussner, Albert Palanqués, Xavier Durrieu de Madron, Miquel Canals, Pere Puig,

Marine and coastal ecosystems

During winter 2005–2006, particle fluxes and near‐bottom currents were measured in and around the Lacaze‐Duthiers and Cap de Creus submarine canyons (western Gulf of Lion). Current anomalies show the occurrence of a major dense shelf water cascading event down to the slope, the latest recorded up to date in the area. Concomitant increased total mass fluxes highlight the ability of cascading waters to transport large amounts of coarse sediment and organic matter, which is predominantly of terrestrial origin. In addition, results reveal that the current regime and associated grain size sorting is the responsible for a geochemical gradient of settling organic particles along the slope.