Resumen del producto

The oceanic biogeochemical cycle creation requires settling particulate matter composition and vertical element flux quantification. This approach was conducted in Alfonso Basin, 410 m deep part of La Paz Bay, Gulf of California, with a desertic-arid limate. Settling particulate matter was collected each 7-15 days by an automated sediment trap during 2002-2008. Major and trace elements were determined using instrumental neutron activation analysis. The particles collected so far show that the total mass flux, composition and different particulate element fluxes show a high variability, not exactly coinciding with each other. Some element changeability seems to be influenced by different origin extraordinary events. Tropical cyclone effect was noted for "Ignacio" (24-26 August, 2003), "Marty" (21-23 September, 2003) and "Henriette" (4-5 September, 2007) hurricanes, on scandium composition, and represents the fluvial terrigenous input. Dust storm effect was found for scandium content and fluxes, related to increased aeolian input during strong northwestern winds on fall-winter. Plankton blooms in June and August of 2002 enhanced the calcium and bio-calcium content in settling particles. A reported silicoflagellate bloom during December, 2007 correlated with the highest particulate calcium and bio-calcium flux. Earthquake influence wasn't registered during the time period, even for a maximum 6.3 magnitude event.

Palabras clave: settling particulate matter; Element fluxes; Alfonso Basin; Episodic events

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