Abstract
Abstract. In spring, the Mediterranean Sea, a well-stratified low-nutrient–low-chlorophyll region, receives atmospheric deposition by 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 relative impacts of the processes involved are still far from being assessed in situ. After summarizing the knowledge on dust deposition and its impact on the Mediterranean Sea biogeochemistry, we present in this context the objectives and strategy of the PEACETIME project and cruise. Atmospheric and marine in situ observations and process studies have been conducted in contrasted areas encountering different atmospheric deposition context, including a dust deposition event that our dedicated “fast-action” strategy allowed us to catch. Process studies also include artificial dust seeding experiments conducted on board in large tanks in three ecoregions of the open waters of the Mediterranean Sea for the first time. This paper summarizes the work performed at sea and the type of data acquired in the atmosphere, at the air–sea interface and in the water column. An overview of the results presented in papers of this special issue (and in some others published elsewhere) is presented.
Highlights
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 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
Our strategy was successful since a wet Saharan dust event was sampled during a dedicated period: the so-called “fast action”. This strategy was very dependent on the occurrence of a dust deposition event during the cruise, so to ensure results corresponding to our questions, simultaneous in situ sampling and characterization in the lower atmosphere and the water column were performed on the route
The PEACETIME oceanographic expedition conducted in spring 2017 cruised over a 20◦ longitudinal gradient across the western and central Mediterranean Sea during the season characterized by strong stratification, low productivity and high probability of wet dust deposition
Summary
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 Guieu, Fabrizio D’Ortenzio, François Dulac, Vincent Taillandier, Andrea Doglioli, Anne Petrenko, Stéphanie Barrillon, Marc Mallet, Pierre Nabat, and Karine Desboeufs5 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 5Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR CNRS 7583, Université de Paris, Université Paris Est Créteil, IPSL, Créteil, France. Received: 9 February 2020 – Discussion started: 28 February 2020 Accepted: 5 July 2020 – Published: 16 November 2020
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