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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2020-44
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-44
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  28 Feb 2020

28 Feb 2020

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This preprint is currently under review for the journal BG.

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)

Cécile Guieu1, Fabrizio D'Ortenzio1, François Dulac2, Vincent Taillandier1, Andrea Doglioli3, Anne Petrenko3, Stéphanie Barrillon3, Marc Mallet4, Pierre Nabat4, and Karine Desboeufs5 Cécile Guieu et al.
  • 1CNRS, Sorbonne Université, Laboratoire d'Océanographie de Villefranche, UMR7093, Villefranche-sur-Mer, France
  • 2Laboratoire des Sciences du Climat et de l'Environnement (LSCE), UMR 8212, CEA-CNRS-UVSQ, IPSL, Univ. Paris-Saclay, CEA Saclay, Gif-sur-Yvette, France
  • 3Aix-Marseille Université, CNRS, Université de Toulon, IRD, Mediterranean Institute of Oceanography, UMR 7294, Marseille, France
  • 4Centre National de Recherches Météorologiques, Météo-France/CNRM/GMGEC/MOSCA, Toulouse, France
  • 5LISA (Laboratoire Interuniversitaire des Systèmes Atmosphériques), UMR CNRS 7583, Université de Paris, Université Paris Est, IPSL, Créteil, France

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.

Cécile Guieu et al.

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Cécile Guieu et al.

Cécile Guieu et al.

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Short summary
We describe here the objectives and strategy of the PEACETIME project and cruise, dedicated to dust deposition and its impacts in the Mediterranean Sea. 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. We summarize the work performed at sea, the type of data acquired and their valorization in in the papers published in the special issue.
We describe here the objectives and strategy of the PEACETIME project and cruise, dedicated to...
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