PEACETIME - From Saharan dust to satellite remote sensing

The PEACETIME project  is to study the fundamental processes and their interactions at the ocean-atmosphere interface, occurring after atmospheric deposition in the Mediterranean Sea, and how these processes impact the functioning of the pelagic ecosystem..

During the cruise that took place in the Mediterranean from May 10 to June 11, 2017, we studied the impact of atmospheric deposition on chemical element cycles, marine biogeochemical processes and flows, marine aerosol emissions and the impact of ongoing changes on the future functioning of riverine communities.

PEACETIME, designed in a multidisciplinary framework, combined dust transport prediction and near-real-time satellite remote sensing tools to maximize the probability of capturing a Saharan dust deposit in a stratified water column to monitor associated in-situ processes.

A series of coupled approaches in the mesopelagic zone have allowed us to link the processes related to atmospheric deposition occurring in the euphotic zone with the remineralisation and the export below.

These approaches include, marine snow catcher, regular and specific sediment traps comprising incubation chamber, in situ sampling using High Pressures Bottles, sinking particles simulation to measure in situ prokaryotic production and respiration rates measurements in relationship with the particles flux over the mesopelagic zone.



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