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Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section

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doi: 10.5194/bg-16-1563-2019
Authors:Gourain, Arthur; Planquette, Hélène; Cheize, Marie; Lemaitre, Nolwenn; Barraqueta, Jan-Lukas Menzel; Shelley, Rachel; Lherminier, Pascale; Sarthou, Géraldine
Author Affiliations:Primary:
Technopôle Brest Iroise, Ifremer, Plouzane, France
Helmholtz Centre for Ocean Research Kiel, Germany
Université Brest, France
Volume Title:Biogeosciences
Source:Biogeosciences, 16(7), p.1563-1582. Publisher: Copernicus GmbH on behalf of the European Union, Katlenburg-Lindau, International. ISSN: 1726-4170
Publication Date:2019
Note:In English. 91 refs.; illus., incl. 2 tables
Summary:The aim of the GEOVIDE cruise (May-June 2014, R/V Pourquoi Pas?) was to provide a better understanding of trace metal biogeochemical cycles in the North Atlantic Ocean. As marine particles play a key role in the global biogeochemical cycle of trace elements in the ocean, we discuss the distribution of particulate iron (PFe), in relation to the distribution of particulate aluminium (PAl), manganese (PMn), and phosphorus (PP). Overall, 32 full vertical profiles were collected for trace metal analyses, representing more than 500 samples. This resolution provides a solid basis for assessing concentration distributions, elemental ratios, size fractionation, and adsorptive scavenging processes in key areas of the thermohaline overturning circulation. Total particulate iron concentrations ranged from as low as 9 pmol Lspan class="inline-formula"-1/span in surface waters of the Labrador Sea to 304 nmol Lspan class="inline-formula"-1/span near the Iberian margin, while median PFe concentrations of 1.15 nmol Lspan class="inline-formula"-1/span were measured over the sub-euphotic ocean interior. Within the Iberian Abyssal Plain, the ratio of PFe to PAl was identical to the continental crust molar ratio (0.21 mol molspan class="inline-formula"-1/span), indicating the important influence of crustal particles in the water column. Overall, the lithogenic component explained more than 87% of PFe variance along the section. Within the Irminger and Labrador basins, the formation of biogenic particles led to an increase in the span class="inline-formula"PFe/PAl/span ratio (up to 0.64 mol molspan class="inline-formula"-1/span) compared to the continental crust ratio. Continental margins induce high concentrations of particulate trace elements within the surrounding water masses (up to 10 nmol Lspan class="inline-formula"-1/span of PFe). For example, horizontal advection of PFe was visible more than 250 km away from the Iberian margin. Additionally, several benthic nepheloid layers were observed more than 200 m above the seafloor along the transect, especially in the Icelandic, Irminger, and Labrador basins, suspending particles with high PFe content of up to 89 nmol Lspan class="inline-formula"-1/span.
Subjects:Atmosphere; Atmospheric precipitation; Benthic environment; Biochemistry; Coastal environment; Concentration; Continental margin; Continental shelf; Deposition; Depth; Geochemical cycle; GEOTRACES; Global; Hydrographs; Iron; Marine environment; Marine sediments; Metals; Particles; Particulate materials; Salinity; Sediments; Suspended materials; Suspension; Trace elements; Trace metals; Arctic region; Atlantic Ocean; Canada; Eastern Canada; Europe; Greenland; Iberian abyssal plain; Iberian Peninsula; Irminger Basin; Labrador Basin; Newfoundland; Newfoundland and Labrador; North Atlantic; Northeast Atlantic; Reykjanes Ridge; South Greenland; Southern Europe; GEOVIDE; Newfoundland Shelf
Record ID:855800-11
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany
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