Deposition and fate of reactive Fe,Mn, P,and C in suspended particulate matter in the Bay of Biscay |
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| Authors: | Pierre Anschutz Gwénaëlle Chaillou |
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| Institution: | 1. Department of Biology and Environmental Science, Linnaeus University, SE 39182, Kalmar, Sweden;2. Geological Survey of Finland (GTK), PO Box 96, FI 02151, Espoo, Finland;3. Åbo Akademi University, Department of Geology and Mineralogy, , FI 20500, Åbo, Finland;4. Southern Cross GeoScience, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;5. Department of Earth Sciences, University of Gothenburg, SE 405 30, Gothenburg, Sweden;1. Acid Sulfate Soils Centre, School of Earth and Environmental Sciences, The University of Adelaide, Adelaide, South Australia, Australia;2. CSIRO Land and Water, Private Bag No 2, Glen Osmond, South Australia 5064, Australia;3. School of the Environment, Flinders University, PO Box 2100, Adelaide SA 5001, Australia;1. Department of Applied Physics, Facultad de Ciencias Experimentales, University of Huelva, Campus de El Carmen, 21071 Huelva, Spain;2. Department of Geodynamics and Paleontology, Facultad de Ciencias Experimentales, University of Huelva, Campus de El Carmen, 21071 Huelva, Spain;3. Department of Physical, Chemical and Natural Systems, University Pablo de Olavide, Ctra. de Utrera km 1, 41013 Sevilla, Spain |
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| Abstract: | Hydrographic structure of the water column, dissolved nutrient concentrations and the distribution of suspended particulate matter were recorded from CDT measurements and Niskin bottles sampling on the continental slope of the Bay of Biscay and on the axis of Capbreton canyon. Ascorbate extraction was applied here for the first time on marine suspended particles to determine the content of reactive Fe- and Mn-oxides, and P associated with Fe-oxides. Hydrographic structure of the south-eastern part of the Bay of Biscay did not change during the last three decades. Particulate organic carbon (POC) contents dropped strongly with depth, showing that organic matter mineralization was efficient in the water column. Organic matter mineralized in the water column had a Redfield N:P ratio. POC percent of particles collected at depth were higher during a bloom period, suggesting that some new organic matter reached the bottom. Contents of Fe and Mn extracted with the ascorbate leaching solution showed that suspended particles originated from the Gironde estuary, one of the major sources of particles in the Bay of Biscay. Intermediate and deeper nepheloid layers occurred in the Capbreton canyon. Particles of nepheloid layers were enriched in Mn- and Fe-oxides because they originated from resuspension of surface sediment. |
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