title: Impact of atmospheric deposition of anthropogenic and natural trace metals on Northwestern Mediterranean surface waters: a box model assessment.
abstract: Under stratified oligotrophic conditions (May-November), the surface mixed layer of the Northwestern Mediterranean constitutes a homogeneous water volume of 10-30 m depth. In other respects, the mean residence time of Ligurian surface waters (0-200 m) is 102 days. It is therefore possible to quantify the extent to which atmospheric deposition of trace metals affects surface waters. On the basis of literature data on anthropogenic and natural trace metals, we demonstrate that the ratios between total seawater labile atmospheric deposition during 102 days (Δc) and dissolved TM concentrations in Ligurian surface waters (c) illustrate the impact of atmospheric deposition on surface seawater (Δc/c). High ratios indicate surface TM enrichments, while low ratios indicate surface TM depletion, due to the quasi-complete sorption and removal of TMs by plankton during spring bloom. The simple box model proposed here may be used for other marine regions where hydrodynamical and physico-chemical constraints are well defined.
authors: UPMC Université Paris 06, UMR 7093, LOV, Observatoire océanographique, F-06234 Villefranche-sur-Mer, France. heimburger@get.obs-mip.fr
authors: Lars-Eric
authors: LE
authors: Heimbürger
authors: Christophe
authors: C
authors: Migon
authors: Daniel
authors: D
authors: Cossa
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere / Q000737:chemistry*; D004784:Environmental Monitoring; D008522:Mediterranean Sea; D008670:Metals / Q000032:analysis; D008956:Models, Chemical; D012623:Seawater / Q000737:chemistry*; D014131:Trace Elements / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D008670:Metals; D014131:Trace Elements; D014874:Water Pollutants, Chemical