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

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...

Full description

Bibliographic Details
Published in:Biogeosciences
Main Authors: 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
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus GmbH 2020
Subjects:
Greenland
Irminger Sea
Newfoundland
Denmark Strait
Labrador Sea
North Atlantic
Online Access:https://archimer.ifremer.fr/doc/00441/55233/56714.pdf
https://archimer.ifremer.fr/doc/00441/55233/56715.pdf
https://archimer.ifremer.fr/doc/00441/55233/70966.pdf
https://archimer.ifremer.fr/doc/00441/55233/70967.pdf
https://doi.org/10.5194/bg-17-917-2020
https://archimer.ifremer.fr/doc/00441/55233/
Description
Summary: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.

Similar Items