%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Waeles, M.
%A Maguer, J. F.
%A Baurand, François
%A Riso, R. D.
%T Off Congo waters (Angola Basin, Atlantic Ocean) : a hot spot for cadmium-phosphate fractionation
%D 2013
%L fdi:010060621
%G ENG
%J Limnology and Oceanography
%@ 0024-3590
%K OCEAN ATLANTIQUE ; ANGOLA BASSIN
%M ISI:000322514600026
%N 4
%P 1481-1490
%R 10.4319/lo.2013.58.4.1481
%U https://www.documentation.ird.fr/hor/fdi:010060621
%> https://www.documentation.ird.fr/intranet/publi/2013/09/010060621.pdf
%V 58
%W Horizon (IRD)
%X We report the distribution of cadmium at 13 stations along 5.83 degrees S in the Angola Basin. The studied area (which is influenced by the plume of the Congo River, doming, and relatively high primary production) is characterized by relatively low-circulation regime, which results in a strong oxygen minimum. In subsurface, very low cadmium : phosphate (Cd : P) ratios (0.05-0.10 nmol L-1 : mu mol L-1) were observed below the euphotic zone (depth range = 50-200 m), indicating that mineralization is the main process explaining the Cd-P fractionation. Cd-P decoupling is not restricted to subsurface waters, but occurs also throughout the oxygen minimum zone. An isopycnal analysis of the Cd : P ratio throughout the Atlantic Ocean shows that upper and intermediate waters in the South-east Atlantic are highly altered in terms of Cd-P properties. Benthic inputs at 4000 m were associated with degradation of organic matter with an important siliceous component, but were not accompanied by substantial changes in the Cd : P ratio.
%$ 032