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PLoS By Category | Recent PLoS Articles
Chemistry

Impacts on the Deep-Sea Ecosystem by a Severe Coastal Storm
Published: Wednesday, January 25, 2012
Author: Anna Sanchez-Vidal et al.

by Anna Sanchez-Vidal, Miquel Canals, Antoni M. Calafat, Galderic Lastras, Rut Pedrosa-Pàmies, Melisa Menéndez, Raúl Medina, Joan B. Company, Bernat Hereu, Javier Romero, Teresa Alcoverro

Major coastal storms, associated with strong winds, high waves and intensified currents, and occasionally with heavy rains and flash floods, are mostly known because of the serious damage they can cause along the shoreline and the threats they pose to navigation. However, there is a profound lack of knowledge on the deep-sea impacts of severe coastal storms. Concurrent measurements of key parameters along the coast and in the deep-sea are extremely rare. Here we present a unique data set showing how one of the most extreme coastal storms of the last decades lashing the Western Mediterranean Sea rapidly impacted the deep-sea ecosystem. The storm peaked the 26th of December 2008 leading to the remobilization of a shallow-water reservoir of marine organic carbon associated with fine particles and resulting in its redistribution across the deep basin. The storm also initiated the movement of large amounts of coarse shelf sediment, which abraded and buried benthic communities. Our findings demonstrate, first, that severe coastal storms are highly efficient in transporting organic carbon from shallow water to deep water, thus contributing to its sequestration and, second, that natural, intermittent atmospheric drivers sensitive to global climate change have the potential to tremendously impact the largest and least known ecosystem on Earth, the deep-sea ecosystem.
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