Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)

Type Article
Date 2020-02
Language English
Author(s) Tonnard Manon1, 2, 3, Planquette Hélène1, Bowie Andrew R.2, 3, Van Der Merwe Pier2, Gallinari Morgane1, Desprez De Gésincourt Floriane1, Germain Yoan4, Gourain Arthur5, Benetti Marion6, 7, Reverdin Gilles7, Tréguer Paul1, Boutorh Julia1, Cheize Marie4, Menzel Barraqueta Jan-Lukas8, Pereira-Contreira Leonardo9, Shelley Rachel4, 10, 11, Lherminier PascaleORCID12, Sarthou Géraldine1
Affiliation(s) 1 : Laboratoire des sciences de l'Environnement MARin – CNRS UMR 6539 – Institut Universitaire Européen de la Mer, Plouzané, 29280, France
2 : Antarctic Climate and Ecosystems – Cooperative Research Centre, Hobart, TAS 7001, Australia
3 : Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS 7001, Australia
4 : Laboratoire Cycles Géochimiques et ressources – Ifremer, Plouzané, 29280, France
5 : Ocean Sciences Department, School of Environmental Sciences, University of Liverpool, L69 3GP, UK
6 : Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland
7 : LOCEAN, Sorbonne Universités, UPMC/CNRS/IRD/MNHN, Paris, France
8 : GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel Wischhofstraße 1–3, Geb. 12 24148 Kiel, Germany
9 : Fundação Universidade Federal do Rio Grande (FURG), R. Luis Loréa, Rio Grande – RS, 96200-350, Brazil
10 : Dept. Earth, Ocean and Atmospheric Science, Florida State University, 117 N Woodward Ave, Tallahassee, Florida, 32301, USA
11 : School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK
12 : Ifremer, Université de Bretagne Occidentale (UBO), CNRS, IRD, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, 29280, Plouzané, France
Source Biogeosciences (1726-4170) (Copernicus GmbH), 2020-02 , Vol. 17 , N. 4 , P. 917-943
DOI 10.5194/bg-17-917-2020
WOS© Times Cited 6
Note Special issue GEOVIDE, an international GEOTRACES study along the OVIDE section in the North Atlantic and in the Labrador Sea (GA01) Editor(s): G. Henderson, M. Lohan, L. Bopp, C. Jeandel, and G. Reverdin
Abstract

Dissolved Fe (DFe) samples from the GEOVIDE voyage (GEOTRACES GA01, May–June 2014) in the North Atlantic Ocean were analysed using a SeaFAST-picoTM coupled to an Element XR HR-ICP-MS and provided interesting insights on the Fe sources in this area. Overall, DFe concentrations ranged from 0.09 ± 0.01 nmol L−1 to 7.8 ± 0.5 nmol L−1. Elevated DFe concentrations were observed above the Iberian, Greenland and Newfoundland Margins likely due to riverine inputs from the Tagus River, meteoric water inputs and sedimentary inputs. Air-sea interactions were suspected to be responsible for the increase in DFe concentrations within subsurface waters of the Irminger Sea due to deep convection occurring the previous winter, that provided iron-to-nitrate ratios sufficient to sustain phytoplankton growth. Increasing DFe concentrations along the flow path of the Labrador Sea Water were attributed to sedimentary inputs from the Newfoundland Margin. Bottom waters from the Irminger Sea displayed high DFe concentrations likely due to the dissolution of Fe-rich particles from the Denmark Strait Overflow Water and the Polar Intermediate Water. Finally, the nepheloid layers were found to act as either a source or a sink of DFe depending on the nature of particles.

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Tonnard Manon, Planquette Hélène, Bowie Andrew R., Van Der Merwe Pier, Gallinari Morgane, Desprez De Gésincourt Floriane, Germain Yoan, Gourain Arthur, Benetti Marion, Reverdin Gilles, Tréguer Paul, Boutorh Julia, Cheize Marie, Menzel Barraqueta Jan-Lukas, Pereira-Contreira Leonardo, Shelley Rachel, Lherminier Pascale, Sarthou Géraldine (2020). Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01). Biogeosciences, 17(4), 917-943. Publisher's official version : https://doi.org/10.5194/bg-17-917-2020 , Open Access version : https://archimer.ifremer.fr/doc/00441/55233/