Wet deposition in the remote western and central Mediterranean as a source of trace metals to surface seawater

Type Article
Date 2022-02
Language English
Author(s) Desboeufs Karine1, Fu Franck1, Bressac MatthieuORCID2, 3, Tovar-Sánchez AntonioORCID4, Triquet Sylvain1, Doussin Jean-François5, Giorio ChiaraORCID6, 7, Chazette PatrickORCID8, Disnaquet JulieORCID9, 10, Feron Anaïs1, Formenti Paola1, Maisonneuve Franck5, Rodríguez-Romero AraceliORCID4, Zapf Pascal5, Dulac François8, Guieu Cécile3
Affiliation(s) 1 : Université de Paris and Univ Paris Est Creteil, CNRS, LISA, UMR 7583, F-75013 Paris, France
2 : Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia
3 : Laboratoire d’Océanographie de Villefranche (LOV), CNRS-Sorbonne Université, INSU, Villefranche-sur-Mer, 06230, France
4 : Department of Ecology and Coastal Management, Institute of Marine Sciences of Andalusia (CSIC), 11510 Puerto Real, Cádiz, Spain
5 : Univ Paris Est Creteil and Université de Paris, CNRS, LISA, UMR 7583, F-94010 Créteil, France
6 : Laboratoire de Chimie de l’Environnement (LCE), UMR 7376 CNRS, Aix-Marseille Université, Marseille, 13331, France
7 : Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
8 : Laboratoire des Sciences du Climat et de l’Environnement (LSCE), UMR 8212 CEA-CNRS-UVSQ, Institut Pierre-Simon Laplace, Univ. Paris-Saclay, 91191 Gif-sur-Yvette, France
9 : Marine Biology Research Division, Scripps Institution of Oceanography, UCSD, USA
10 : Sorbonne Université, CNRS, Laboratoire d’Océanographie Microbienne, LOMIC, France
Source Atmospheric Chemistry And Physics (1680-7316) (Copernicus GmbH), 2022-02 , Vol. 22 , N. 4 , P. 2309-2332
DOI 10.5194/acp-22-2309-2022
WOS© Times Cited 4
Note Atmospheric deposition in the low-nutrient-low-chlorophyll (LNLC) ocean: effects on marine life today and in the future (BG/ACP inter-journal SI) Editor(s): ACP co-editors | Coordinator: Maria Kanakidou Special issue jointly organized between Biogeosciences and Atmospheric Chemistry and Physics
Abstract

his study reports the only recent characterisation of two contrasted wet deposition events collected during the PEACETIME cruise in the Mediterranean open seawater, and their impact on trace metals (TMS) marine stocks. Rain samples were analysed for Al, 12 trace metals (TMs hereafter, including Co, Cd, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Ti, V and Zn) and nutrients (N, P, DOC) concentrations. The first rain sample collected in the Ionian Sea (rain ION) was a wet typical regional background deposition event whereas the second rain collected in the Algerian Basin (rain FAST) was a Saharan dust wet deposition. The concentrations of TMs in the two rain samples were significantly lower compared to concentrations in rains collected at coastal sites reported in the literature, suggesting either less anthropogenic influence in the remote Mediterranean environment, or decreased emissions during the last decades in the Mediterranean Sea. The TMs inventories in the surface microlayer and mixed layer (0–20 m) at ION and FAST stations before and after the events, compared to atmospheric fluxes, showed that the atmospheric inputs were a significant source of particulate TMs for both layers. At the scale of the western and central Mediterranean, the atmospheric inputs were of the same order of magnitude as marine stocks within the ML for dissolved Fe, Co and Zn, underlining the role of the atmosphere in their biogeochemical cycle in the stratified Mediterranean Sea. In case of intense wet dust deposition event, the contribution of atmospheric inputs could be critical for dissolved stocks of the majority of TMs.

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Desboeufs Karine, Fu Franck, Bressac Matthieu, Tovar-Sánchez Antonio, Triquet Sylvain, Doussin Jean-François, Giorio Chiara, Chazette Patrick, Disnaquet Julie, Feron Anaïs, Formenti Paola, Maisonneuve Franck, Rodríguez-Romero Araceli, Zapf Pascal, Dulac François, Guieu Cécile (2022). Wet deposition in the remote western and central Mediterranean as a source of trace metals to surface seawater. Atmospheric Chemistry And Physics, 22(4), 2309-2332. Publisher's official version : https://doi.org/10.5194/acp-22-2309-2022 , Open Access version : https://archimer.ifremer.fr/doc/00718/83003/