Wet deposition in the remote western and central Mediterranean as a source of trace metals to surface seawater
View / Open Files
Authors
Desboeufs, K
Fu, F
Bressac, M
Tovar-Sánchez, A
Triquet, S
Doussin, JF
Giorio, C
Chazette, P
Disnaquet, J
Feron, A
Formenti, P
Maisonneuve, F
Rodríguez-Romero, A
Zapf, P
Dulac, F
Guieu, C
Publication Date
2022Journal Title
Atmospheric Chemistry and Physics
ISSN
1680-7316
Publisher
Copernicus GmbH
Volume
22
Issue
4
Pages
2309-2332
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Desboeufs, K., Fu, F., Bressac, M., Tovar-Sánchez, A., Triquet, S., Doussin, J., Giorio, C., et al. (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. https://doi.org/10.5194/acp-22-2309-2022
Abstract
<jats:p>Abstract. This study reports the only recent characterization of two
contrasted wet deposition events collected during the PEACETIME (ProcEss studies at the Air–sEa Interface after dust
deposition in the MEditerranean Sea) cruise in
the open Mediterranean Sea (Med Sea) and their impact on trace metal (TM)
marine stocks. Rain samples were analysed for Al, 12 TMs (Co, Cd, Cr, Cu,
Fe, Mn, Mo, Ni, Pb, Ti, V and Zn) and nutrient (N, P, dissolved organic
carbon) concentrations. The first rain sample collected in the Ionian Sea
(Rain ION) was a typical regional background wet deposition event, whereas
the second rain sample collected in the Algerian Basin (Rain FAST) was a
Saharan dust wet deposition event. Even in the remote Med Sea, all background TM
inputs presented an anthropogenic signature, except for Fe, Mn and Ti. 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, due to the decrease in anthropogenic emissions during the
preceding decades. The atmospheric TM inputs were mainly dissolved forms,
even in dusty Rain FAST. The TM stocks in the mixed layer (ML, 0–20 m) at
the FAST station before and after the event showed that the atmospheric
inputs were a significant supply of particulate TMs and dissolved Fe and
Co for surface seawater. Even if the wet deposition delivers TMs mainly in
soluble form, the post-deposition aerosol dissolution could to be a key
additional pathway in the supply of dissolved TMs. At the scale of the
western and central Mediterranean, the atmospheric inputs were of the same
order of magnitude as ML stocks for dissolved Fe, Co and Zn, highlighting
the role of the atmosphere in their biogeochemical cycles in the stratified
Med Sea. In case of intense dust-rich wet deposition events, the
role of atmospheric inputs as an external source was extended to dissolved
Co, Fe, Mn, Pb and Zn. Our results suggest that the wet deposition
constitutes only a source of some of dissolved TMs for Med Sea surface waters.
The contribution of dry deposition to the atmospheric TM inputs needs to be
investigated.
</jats:p>
Identifiers
External DOI: https://doi.org/10.5194/acp-22-2309-2022
This record's URL: https://www.repository.cam.ac.uk/handle/1810/334683
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.