TY - JOUR TI - Cadmium in the waters off South Morocco: Nature of particles hosting Cd and insights into the mechanisms fractionating Cd from phosphate AU - Waeles, Matthieu AU - Planquette, Helene AU - Afandi, Imane AU - Delebecque, Nina AU - Bouthir, Fatimazohra AU - Donval, Anne AU - Shelley, Rachel U. AU - Auger, Pierre-Amael AU - Riso, Ricardo D. AU - Tito-de-Morais, Luis T2 - Journal of Geophysical Research-Oceans AB - In this study, we report the distributions of total dissolvable cadmium and particulate cadmium from 27 stations in southern Moroccan coastal waters (22 degrees N-30 degrees N), which is part of the North-West African upwelling system. These distributions were predominantly controlled by upwelling of the North Atlantic Central Waters (NACWs) and uptake by primary production. Atmospheric inputs and phosphogypsum slurry inputs from the phosphate industry at Jorf Lasfar (33 degrees N), recently estimated as an important source of dissolved cadmium (240 t Cd yr(-1)), are at best of minor importance for the studied waters. Our study provides new insights into the mechanisms fractionating cadmium from phosphate. In the upper 30 m, the anomalies observed in terms of Cd:P ratios in both the particulate and total dissolvable fractions were related to an overall preferential uptake of phosphate. We show that the type of phytoplanktonic assemblage (diatoms versus dinoflagellates) is also a determinant of the fractionation intensity. In subsurface waters (30-60 m), a clear preferential release of P (versus Cd) was observed indicating that remineralization in Oxygen Minimum Zones is a key process in sequestering Cd. DA - 2016/05// PY - 2016 DO - 10.1002/2016JC011688 DP - Web of Science VL - 121 IS - 5 SP - 3106 EP - 3120 J2 - J. Geophys. Res.-Oceans LA - English SN - 2169-9275 ST - Cadmium in the waters off South Morocco UR - http://onlinelibrary.wiley.com/doi/10.1002/2016JC011688/abstract KW - 20% Chibido HCERES 2020 KW - 4251 Marine pollution KW - 4279 Upwelling and convergences KW - 4805 Biogeochemical cycles, processes, and modeling KW - ACL KW - BITMAP_ANR-12-PDOC-0025 KW - CNRS KW - DISCOVERY KW - E3 KW - EPURE KW - EPURE_ANR-11-CEPL-0005 KW - IRD KW - LabexMER_ANR-10-LABX-0019 KW - SUD KW - UBO KW - atlantic KW - biological production KW - cadmium KW - chibido KW - coastal waters KW - dissolved cadmium KW - fractionation KW - in-situ KW - pacific-ocean KW - particulate material KW - phosphate KW - spatial variability KW - surface waters KW - trace-metals KW - uptake KW - upwelling ER -