Process studies at the air-sea interface after atmospheric deposition in the Mediterranean Sea: objectives and strategy of the PEACETIME oceanographic campaign (May–June 2017)

Type Article
Acceptance Date 2020 IN PRESS
Language English
Author(s) Guieu Cécile1, D'Ortenzio Fabrizio1, Dulac François2, Taillandier Vincent1, Doglioli Andrea3, Petrenko Anne3, Barrillon Stéphanie3, Mallet Marc4, Nabat Pierre4, Desboeufs Karine5
Affiliation(s) 1 : CNRS, Sorbonne Université, Laboratoire d'Océanographie de Villefranche, UMR7093, Villefranche-sur-Mer, France
2 : Laboratoire des Sciences du Climat et de l'Environnement (LSCE), UMR 8212, CEA-CNRS-UVSQ, IPSL, Univ. Paris-Saclay, CEA Saclay, Gif-sur-Yvette, France
3 : Aix-Marseille Université, CNRS, Université de Toulon, IRD, Mediterranean Institute of Oceanography, UMR 7294, Marseille, France
4 : Centre National de Recherches Météorologiques, Météo-France/CNRM/GMGEC/MOSCA, Toulouse, France
5 : LISA (Laboratoire Interuniversitaire des Systèmes Atmosphériques), UMR CNRS 7583, Université de Paris, Université Paris Est, IPSL, Créteil, France
Source Biogeosciences (1726-4189) (Copernicus GmbH) In Press
DOI 10.5194/bg-2020-44
Note Special issue | Atmospheric deposition in the low-nutrient-low-chlorophyll (LNLC) ocean: effects on marine life today and in the future (BG/ACP inter-journal SI)(BG/ACP inter-journal SI) Editor(s): Christine Klaas, Cecile Guieu, Karine Desboeufs, Jan-Berend Stuut, Mark Moore, Paraskevi Pitta, Silvia Becagli, and Chiara Santinelli Special issue jointly organized between Biogeosciences and Atmospheric Chemistry and Physics
Abstract

In spring, the Mediterranean Sea, a well-stratified low nutrient low chlorophyll region, receives atmospheric deposition both desert dust from the Sahara and airborne particles from anthropogenic sources. Such deposition translates into a supply of new nutrients and trace metals for the surface waters that likely impact biogeochemical cycles. However, the quantification of the impacts and the processes involved are still far from being assessed in situ. In this paper, we provide a state of the art regarding dust deposition and its impact on the Mediterranean Sea biogeochemistry and we describe in this context the objectives and strategy of the PEACETIME project and cruise, entirely dedicated to filling this knowledge gap. Our strategy to go a step forward than in previous approaches in understanding these impacts by catching a real deposition event at sea is detailed. The PEACETIME oceanographic campaign took place in May–June 2017 and we describe how we were able to successfully adapt the planned transect in order to sample a Saharan dust deposition event, thanks to a dedicated strategy, so-called Fast Action. That was successful, providing, for the first time in our knowledge, a coupled atmospheric and oceanographic sampling before, during and after an atmospheric deposition event. Atmospheric and marine in situ observations and process studies have been conducted in contrasted area and we summarize the work performed at sea, the type of data acquired and their valorization in the papers published in the special issue.

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Guieu Cécile, D'Ortenzio Fabrizio, Dulac François, Taillandier Vincent, Doglioli Andrea, Petrenko Anne, Barrillon Stéphanie, Mallet Marc, Nabat Pierre, Desboeufs Karine Process studies at the air-sea interface after atmospheric deposition in the Mediterranean Sea: objectives and strategy of the PEACETIME oceanographic campaign (May–June 2017). Biogeosciences IN PRESS. Publisher's official version : https://doi.org/10.5194/bg-2020-44 , Open Access version : https://archimer.ifremer.fr/doc/00611/72340/