Vertical export flux of metals in the Mediterranean Sea |
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| Institution: | 1. Dauphin Island Sea Lab & Department of Marine Sciences, University of South Alabama, 101 Bienville Boulevard, Dauphin Island, AL 36528, USA;2. Institute of Hydrobiology, Chinese Academy of Sciences, No. 7 South Donghu Road, Wuhan, Hubei 430072, China;3. Washington State Department of Natural Resources, 1111 Washington St. SE, Olympia, WA 98504, USA;4. Hart Crowser, Inc., 190 Dayton St., Edmonds, WA 98020, USA;1. Department of Biology, McMaster University, 1280 Main Street W, Hamilton L8S 4K1, ON, Canada;2. Department of Medical Physics and Applied Radiation Sciences, McMaster University, 1280 Main St W, Hamilton L8S 4L8, ON, Canada;3. Department of Biology, University of Regina, 3737 Wascana Parkway, Regina S4S 0A2, SK, Canada;4. Northern Ontario School of Medicine, Laurentian University, 935 Ramsey Lake Rd, Sudbury P3E 2C6, ON, Canada |
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| Abstract: | We examined metal (Al, V, Cr, Mn, Fe, Ni, Cu, Zn, Cd and Pb) and particulate organic carbon (OC) concentrations of the marine vertical export flux at the DYFAMED time-series station in the Northwestern Mediterranean Sea. We present here the first data set of natural and anthropogenic metals from sediment trap moorings deployed at 1000 m-depth between 2003 and 2007 at the DYFAMED site. A highly significant correlation was observed between most metal concentrations, whatever the nature and emission source of the metal. Cu, Zn and Cd exhibit different behaviors, presumably due to their high solubility and complexation with organic ligands. The observed difference of atmospheric and marine fluxes in terms of temporal variability and elemental concentration suggests that dense water convection and primary production and not atmospheric deposition control the marine vertical export flux. This argument is strengthened by the fact that significant Saharan dust events did not result in concomitant marine vertical export fluxes nor did they generate significant changes in metal concentrations of trapped particles. |
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| Keywords: | Trace metals Sediment trap Mediterranean Sea Vertical export flux Ballasting |
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