L.-E. Heimbürger , C. Migon , R. Losno , J.-C. Miquel , N. Leblond , and D. Cossa
Mass fluxes and trace metal (TM) fluxes were measured from samples collected in 2003 to 2005 from sediment traps deployed at 1000 m depth at the DYFAMED (DYnamique des Flux Atmosphériques en MEDiterranée) time-series station (central Ligurian Sea, 2350 m depth). A highly significant correlation is observed between all TM fluxes, whatever the nature and emission source of the TM (e.g., crustal such as Al, Fe, Co, or anthropogenic such as Zn, Cd, Pb) and the mass flux. Because these TMs originate from different emission sources, and, therefore, their atmospheric deposition to the sea surface varies with different seasonal patterns, it is suggested that fluxes of particulate organic carbon determine fluxes of TMs, and not the contrary. The seasonal sequence of the transfer of TMs to sea floor (winter convection, spring bloom and nutrient depletion of surface waters in summer and autumn) is briefly examined to highlight the concomitant temporal variability of mass and TM fluxes. This suggests that the TM downward transfer is totally controlled by the seasonal variability of biogenic carbon production, itself depending upon the intensity of winter convection. This may be a peculiarity of marine regions such as the Ligurian Sea, where hydrodynamical features (and, therefore, spring blooms) are strongly constrained by climatic and meteorological conditions (winter temperature, wind events, rain events).
Received: 08 Mar 2010 – Discussion started: 08 Apr 2010
L.-E. Heimbürger , C. Migon , R. Losno , J.-C. Miquel , N. Leblond , and D. Cossa
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Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
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Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
L.-E. Heimbürger , C. Migon , R. Losno , J.-C. Miquel , N. Leblond , and D. Cossa
L.-E. Heimbürger , C. Migon , R. Losno , J.-C. Miquel , N. Leblond , and D. Cossa
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