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

Citation

Tonnard, M and Planquette, H and Bowie, AR and van der Merwe, P and Gallinari, M and de Gesincourt, FD and Germain, Y and Gourain, A and Benetti, M and Reverdin, G and Treguer, P and Boutorh, J and Cheize, M and Lacan, F and Barraqueta, J-LM and Pereira-Contreira, L and Shelley, R and Lherminier, P and Sarthou, G, Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01), Biogeosciences, 17 pp. 917-943. ISSN 1726-4170 (2020) [Refereed Article]


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Copyright 2020 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.5194/bg-17-917-2020

Abstract

Dissolved Fe (DFe) samples from the GEOVIDE voyage (GEOTRACES GA01, May–June 2014) in the North Atlantic Ocean were analyzed using a seaFAST-pico™ coupled to an Element XR sector field inductively coupled plasma mass spectrometer (SF-ICP-MS) and provided interesting insights into the Fe sources in this area. Overall, DFe concentrations ranged from 0.09±0.01 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. Deep winter convection occurring the previous winter provided iron-to-nitrate ratios sufficient to sustain phytoplankton growth and lead to relatively elevated DFe concentrations within subsurface waters of the Irminger Sea. 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 in the Denmark Strait Overflow Water and the Polar Intermediate Water. Finally, the nepheloid layers located in the different basins and at the Iberian Margin were found to act as either a source or a sink of DFe depending on the nature of particles, with organic particles likely releasing DFe and Mn particle scavenging DFe.

Item Details

Item Type:Refereed Article
Keywords:dissolved iron, North Atlantic Ocean, Labrador Sea, GEOVIDE section, GEOTRACES
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical oceanography
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Measurement and assessment of marine water quality and condition
UTAS Author:Tonnard, M (Miss Manon Tonnard)
UTAS Author:Bowie, AR (Professor Andrew Bowie)
UTAS Author:van der Merwe, P (Dr Pier van der Merwe)
ID Code:137715
Year Published:2020
Web of Science® Times Cited:9
Deposited By:Oceans and Cryosphere
Deposited On:2020-02-28
Last Modified:2020-12-07
Downloads:2 View Download Statistics

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