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

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dc.contributor.authorGourain, Arthuren_ZA
dc.contributor.authorPlanquette, Heleneen_ZA
dc.contributor.authorCheize, Marieen_ZA
dc.contributor.authorLemaitre, Nolwennen_ZA
dc.contributor.authorBarraqueta, Jan-Lukas Menzelen_ZA
dc.contributor.authorShelley, Rachelen_ZA
dc.contributor.authorLherminier, Pascaleen_ZA
dc.contributor.authorSarthou, Geraldineen_ZA
dc.date.accessioned2021-08-16T06:47:24Z
dc.date.available2021-08-16T06:47:24Z
dc.date.issued2019-04-12
dc.descriptionCITATION: Gourain, A., et al. 2019. Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section. Biogeosciences, 16:1563–1582. doi:10.5194/bg-16-1563-2019
dc.descriptionThe original publication is available at https://www.biogeosciences.net/
dc.description.abstractThe 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 L−1 in surface waters of the Labrador Sea to 304 nmol L−1 near the Iberian margin, while median PFe concentrations of 1.15 nmol L−1 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 mol−1), 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 PFe∕PAl ratio (up to 0.64 mol mol−1) compared to the continental crust ratio. Continental margins induce high concentrations of particulate trace elements within the surrounding water masses (up to 10 nmol L−1 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 L−1.en_ZA
dc.description.urihttps://bg.copernicus.org/articles/16/1563/2019/
dc.description.versionPublisher’s version
dc.format.extent20 pages : illustrations, mapsen_ZA
dc.identifier.citationGourain, A., et al. 2019. Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section. Biogeosciences, 16:1563–1582. doi:10.5194/bg-16-1563-2019
dc.identifier.issn1726-4189 (online)
dc.identifier.issn1726-4170 (print)
dc.identifier.otherdoi:10.5194/bg-16-1563-2019
dc.identifier.urihttp://hdl.handle.net/10019.1/110850
dc.language.isoen_ZAen_ZA
dc.publisherCopernicus Publications
dc.rights.holderAuthors retain copyright
dc.subjectGEOVIDEen_ZA
dc.subjectBiogeochemical cycles -- North Atlanticen_ZA
dc.subjectMetals -- Analysisen_ZA
dc.titleInputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) sectionen_ZA
dc.typeArticleen_ZA
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