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| Nolting, Rf; Helder, W. |
| Profiles of 0.1 N HCl leachable Pb and Zn in the sediments of the Gulf of Lions (North West Mediterranean) indicate that the concentrations of these metals are, especially in the vicinity of the triple-overdot Rhone outflow and in the Rhone plume, determined by input from the river. Solid phase Pb and Zn are more than three times higher than their pre-industrial background. At the offshore, deep ( > 2 000 m) stations in the Gulf of Lions, the surface concentration of solid phase Pb and Zn are about twofold enriched compared to background values. The profiles from these deep stations preserve, due to the restricted mobility of Pb and Zn and the lack of bioturbation in the sediment, a historical record of the increased atmospheric deposition of these... |
| Tipo: Text |
Palavras-chave: LEAD; ZINC; CONCENTRATION; SEDIMENTS; GULF OF LIONS. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00101/21264/18875.pdf |
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| Fisher, Ns; Nolan, Cv; Gorsky, G. |
| The discarded houses of appendicularians can be important components of marine snow and might therefore be instrumental in mediating the vertical flux of metals from surface waters in oceanic ecosystems. Their significance in this regard depends on the retention of metals in these organic debris. To assess this, an experiment was conducted in which the release of cadmium and zinc from discarded houses of the appendicularian Oikopleura longicauda was studied using gamma-emitting radiotracers. The retention curves of the two metals conformed with a single exponential decay loss model. The retention half-times were of the order of two days, suggesting that sinking appendicularian houses would not transport these metals to deep ocean waters but could... |
| Tipo: Text |
Palavras-chave: APPENDICULARIANS; CADMIUM; ZINC; LARVACEANS; VERTICAL TRANSPORT. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00103/21376/18976.pdf |
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