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| Ebersbach, Friederike; Assmy, Philipp; Martin, Patrick; Schulz, Isabelle; Wolzenburg, Sina; Noethig, Eva-maria. |
| The taxonomic composition and types of particles comprising the downward particle flux were examined during the mesoscale artificial iron fertilisation experiment LOHAFEX. The experiment was conducted in low-silicate waters of the Atlantic Sector of the Southern Ocean during austral summer (January-March 2009), and induced a bloom dominated by small flagellates. Downward particle flux was low throughout the experiment, and not enhanced by addition of iron; neutrally buoyant sediment traps contained mostly faecal pellets and faecal material apparently reprocessed by mesozooplankton. TEP fluxes were low, <= 5 mg GX eq. m(-2) d(-1), and a few phytodetrital aggregates were found in the sediment traps. Only a few per cent of the POC flux was found in the... |
| Tipo: Text |
Palavras-chave: Nano- and picoplankton; Export flux; Iron fertilisation; Protists; Sediment trap; Southern Ocean. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00290/40121/39348.pdf |
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| Heimbuerger, Lars-eric; Migon, Christophe; Losno, Rémi; Miquel, Juan-carlos; Thibodeau, Benoit; Stabholz, Marion; Dufour, Aurelie; Leblond, Nathalie. |
| 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 very high solubility and complexation with organic ligands. The observed difference of atmospheric and marine fluxes in terms of temporal variability and elemental... |
| Tipo: Text |
Palavras-chave: Trace metals; Sediment trap; Mediterranean Sea; Vertical export flux; Ballasting. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00176/28774/27247.pdf |
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