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Transport transatlantique et dépôt de poussières sahariennes et leurs effets sur le milieu marin

Colloque/Séminaire/Conférences-Rencontres/Débats

Ce séminaire exceptionnel de l'Observatoire Midi-Pyrénées sera présenté par Jan-Berend W. Stuut, NIOZ - Royal Netherlands Institute for Sea Research and Utrecht University / MARUM - Center for Marine Environmental Science.

Transatlantic transport and deposition of saharan dust and its effects on the marine environment.

Massive amounts of Northwest African dust are transported westward over the Atlantic Ocean towards the Americas each year. These dust particles are thought to feed back on climate through a number of mechanisms including reflection of solar energy at the top of the atmosphere, absorption of energy that was reflected at the Earth’s surface in the lower atmosphere, changes of the Earth’s albedo, and fertilisation of both terrestrial and marine ecosystems.

Using a source-to-sink approach, we are monitoring Saharan dust transport and deposition using an array of instruments collecting dust on land in Mauritania as well as both at sea and settling through the ocean, along a transect at 12°N between Northwest Africa and the Caribbean. We compare our results to Saharan-dust samples collected on Barbados, as well as to transatlantic Saharan transport and deposition modelled using a CESM. Next to the dust particles, we also study the marine-environmental effects of dust deposition, including plankton communities and biomarkers. In this presentation, we will introduce the projects in the framework of which this study is carried out, and present preliminary data on Saharan dust transport and deposition as well as marine-environmental observations.

Contact: yves.meyerfeld@aero.obs-mip.fr

Dates
le 2 juillet 2018
de 11h00 à 12h30
Lieu(x)
Observatoire Midi-Pyrénées
Salle Coriolis
14 Avenue Edouard Belin
Toulouse

Date de mise à jour 29 mai 2018


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