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Settling particles were collected using sediment traps deployed along threetransects in the Lacaze-Duthiers and Cap de Creus canyons and the adjacentsouthern open slope from October 2005 to October 2006. The settling materialwas analyzed to obtain total mass fluxes and main constituent contents(organic matter, opal, calcium carbonate, and siliciclastics). Cascades ofdense shelf water from the continental shelf edge to the lower continentalslope occurred from January to March 2006. They were traced through strongnegative near-bottom temperature anomalies and increased current speeds, andgenerated two intense pulses of mass fluxes in January and March 2006. Thisoceanographic phenomenon appeared as the major physical forcing of settlingparticles at almost all stations, and caused both high seasonal variabilityin mass fluxes and important qualitative changes in settling material.Fluxes during the dense shelf water cascading (DSWC) event ranged from90.1 g m−2 d−1 at the middle Cap de Creus canyon (1000 m) to3.2 g m−2 d−1 at the canyon mouth (1900 m). Fractions of organic matter,opal and calcium carbonate components increased seaward, thus diminishingthe siliciclastic fraction. Temporal variability of the major components waslarger in the canyon mouth and open slope sites, due to the mixed impact ofdense shelf water cascading processes and the pelagic biological production.Results indicate that the cascading event remobilized and homogenized largeamounts of material down canyon and southwardly along the continental slopecontributing to a better understanding of the off-shelf particle transportand the internal dynamics of DSWC events

Flux and composition of settling particles across the continental margin of the Gulf of Lion: the role of dense shelf water cascading