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handle: 10261/93555 , 10261/62991
[ES] El Mediterráneo noroccidental es una importante zona de formación invernal de agua profunda, un proceso que ocurre en dos variantes: la convección en mar abierto y el hundimiento de agua densa de plataforma en forma de cataratas submarinas (“cascading”). La relevancia del cascading en la dinámica sedimentaria de la cuenca y los márgenes del Mediterráneo noroccidental es hoy ampliamente reconocida, mientras que la convección de mar abierto ha recibido más atención desde un punto de vista hidrológico. En este trabajo se presentan datos de flujos de partículas y corrientes a 200 m, 1000 m de profundidad y cerca del fondo (2350 m) en la estación DYFAMED, durante un notable episodio de formación de agua profunda (invierno 2005-2006). Durante este evento, las corrientes se intensificaron en toda la columna de agua, alcanzando valores similares hasta el fondo (máximo 39 cm s-1). Al mismo tiempo, el flujo de partículas medido cerca del fondo se incrementó en dos órdenes de magnitud (máximo 9 g m-2 d-1). Estos resultados sugieren que la convección en mar abierto es un mecanismo relevante en la resuspensión y redistribución de sedimentos en la cuenca profunda del Mediterráneo noroccidental.
[EN] The northwestern Mediterranean is a well known area of deep water formation via dense shelf water cascading and offshore convection. The impact of the former in the sediment dynamics of the deep basin has been highlighted in recent years, while open sea convection has been solely studied from a hydrological perspective. Particle fluxes and hydrodynamics were monitored at the DYFAMED site (Ligurian Sea, northwestern Mediterranean) at 200, 1000 m and near the seafloor (2350 m depth) during winter 2005-2006 and the following spring. From February to April 2006, and in coincidence with a remarkable episode of deep water formation, currents intensified throughout the entire water column to the bottom, where particle flux increased up to two orders of magnitude (maximum 9 g m-2 d-1). These observations suggest that open-sea deep convection is to be considered, together with cascading, as a relevant driving force for sedimentary dynamics in the northwestern Mediterranean basin.
Este trabajo fue financiado por INSU (Francia), el Organismo Internacional de la Energía Atómica y el Proyecto HERMES (EC contract GOCE-CT-2005-511234).
VIII Congreso Geológico de España (Oviedo, 2012). -- 4 pages, 5 figures.-- Versión pre-print
Peer reviewed
Mar Ligur, Western Mediterranean, DYFAMED, Resuspensión, Dense water formation, Formación de agua profunda, Dinámica sedimentaria, Particle flux, Sediment dynamics, Mediterráneo noroccidental, Northwestern Mediterranean
Mar Ligur, Western Mediterranean, DYFAMED, Resuspensión, Dense water formation, Formación de agua profunda, Dinámica sedimentaria, Particle flux, Sediment dynamics, Mediterráneo noroccidental, Northwestern Mediterranean
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