25 Aug 2021

25 Aug 2021

Review status: this preprint is currently under review for the journal ACP.

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

Karine Desboeufs1, Franck Fu1, Matthieu Bressac2,3, Antonio Tovar-Sánchez4, Sylvain Triquet1, Jean-François Doussin5, Chiara Giorio6,7, Patrick Chazette8, Julie Disnaquet9,10, Anaïs Feron1, Paola Formenti1, Franck Maisonneuve5, Araceli Rodríguez-Romero4, Pascal Zapf5, François Dulac8, and Cécile Guieu3 Karine Desboeufs et al.
  • 1Université de Paris and Univ Paris Est Creteil, CNRS, LISA, UMR 7583, F-75013 Paris, France
  • 2Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia
  • 3Laboratoire d’Océanographie de Villefranche (LOV), CNRS-Sorbonne Université, INSU, Villefranche-sur-Mer, 06230, France
  • 4Department of Ecology and Coastal Management, Institute of Marine Sciences of Andalusia (CSIC), 11510 Puerto Real, Cádiz, Spain
  • 5Univ Paris Est Creteil and Université de Paris, CNRS, LISA, UMR 7583, F-94010 Créteil, France
  • 6Laboratoire de Chimie de l’Environnement (LCE), UMR 7376 CNRS, Aix-Marseille Université, Marseille, 13331, France
  • 7Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW, Cambridge, United Kingdom
  • 8Laboratoire 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
  • 9Marine Biology Research Division, Scripps Institution of Oceanography, UCSD, USA
  • 10Sorbonne Université, CNRS, Laboratoire d’Océanographie Microbienne, LOMIC, France

Abstract. This 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.

Karine Desboeufs et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-624', Rachel Shelley, 16 Sep 2021
  • RC2: 'Comment on acp-2021-624', Rachel Shelley, 16 Sep 2021
  • RC3: 'Comment on acp-2021-624', Anonymous Referee #2, 21 Sep 2021

Karine Desboeufs et al.

Data sets

Biogeochemical dataset collected during the PEACETIME cruise Guieu et al.

Karine Desboeufs et al.


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Short summary
This article reports the first sampling of wet deposition samples concurrently with surface seawaters performed during the PEACETIME cruise in the remote Mediterranean (May–June 2017). Through the chemical composition of trace metals (TMs) in these samples, it emphasizes both the decrease of atmospheric metals pollution in this area during the last decades and the critical role of wet deposition as source of TMs for Med surface seawaters, notably in case of intense dust deposition event.