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Biogeosciences An interactive open-access journal of the European Geosciences Union
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© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 04 Apr 2018

Submitted as: research article | 04 Apr 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Biogeosciences (BG).

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

Manon Tonnard1,2,3, Hélène Planquette1, Andrew R. Bowie2,3, Pier van der Merwe2, Morgane Gallinari1, Floriane Desprez de Gésincourt1, Yoan Germain4, Arthur Gourain5, Marion Benetti6,7, Gilles Reverdin7, Paul Tréguer1, Julia Boutorh1, Marie Cheize1, Jan-Lukas Menzel Barraqueta8, Leonardo Pereira-Contreira9, Rachel Shelley1,10,11, Pascale Lherminier12, and Géraldine Sarthou1 Manon Tonnard et al.
  • 1Laboratoire des sciences de l'Environnement MARin – CNRS UMR 6539 – Institut Universitaire Européen de la Mer, Plouzané, 29280, France
  • 2Antarctic Climate and Ecosystems – Cooperative Research Centre, Hobart, TAS 7001, Australia
  • 3Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS 7001, Australia
  • 4Laboratoire Cycles Géochimiques et ressources – Ifremer, Plouzané, 29280, France
  • 5Ocean Sciences Department, School of Environmental Sciences, University of Liverpool, L69 3GP, UK
  • 6Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland
  • 7LOCEAN, Sorbonne Universités, UPMC/CNRS/IRD/MNHN, Paris, France
  • 8GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel Wischhofstraße 1–3, Geb. 12 24148 Kiel, Germany
  • 9Fundação Universidade Federal do Rio Grande (FURG), R. Luis Loréa, Rio Grande – RS, 96200-350, Brazil
  • 10Dept. Earth, Ocean and Atmospheric Science, Florida State University, 117 N Woodward Ave, Tallahassee, Florida, 32301, USA
  • 11School of Geography, Earth and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK
  • 12Ifremer, Université de Bretagne Occidentale (UBO), CNRS, IRD, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, 29280, Plouzané, France

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.

Manon Tonnard et al.
Interactive discussion
Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Manon Tonnard et al.
Manon Tonnard et al.
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Short summary
We investigated the spatial distribution of dissolved Fe during spring 2014, in order to understand the processes influencing the biogeochemical cycle in the North Atlantic. Our results highlighted elevated Fe close to riverine inputs at the Iberian Margin and glacial inputs at the Newfoundland and Greenland Margins. Atmospheric deposition appeared to be a minor source of Fe. Convection was an important source of Fe in the Irminger Sea but was however depleted in Fe relative to nitrate.
We investigated the spatial distribution of dissolved Fe during spring 2014, in order to...