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Iron biogeochemistry in the high latitude North Atlantic Ocean

Iron biogeochemistry in the high latitude North Atlantic Ocean
Iron biogeochemistry in the high latitude North Atlantic Ocean
Iron (Fe) is an essential micronutrient for marine microbial organisms, and low supply controls productivity in large parts of the world’s ocean. The high latitude North Atlantic is seasonally Fe limited, but Fe distributions and source strengths are poorly constrained. Surface ocean dissolved Fe (DFe) concentrations were low in the study region (<0.1 nM) in summer 2010, with significant perturbations during spring 2010 in the Iceland Basin as a result of an eruption of the Eyjafjallajökull volcano (up to 2.5 nM DFe near Iceland) with biogeochemical consequences. Deep water concentrations in the vicinity of the Reykjanes Ridge system were influenced by pronounced sediment resuspension, with indications for additional inputs by hydrothermal vents, with subsequent lateral transport of Fe and manganese plumes of up to 250–300 km. Particulate Fe formed the dominant pool, as evidenced by 4–17 fold higher total dissolvable Fe compared with DFe concentrations, and a dynamic exchange between the fractions appeared to buffer deep water DFe. Here we show that Fe supply associated with deep winter mixing (up to 103 nmol m−2 d−1) was at least ca. 4–10 times higher than atmospheric deposition, diffusive fluxes at the base of the summer mixed layer, and horizontal surface ocean fluxes.
2045-2322
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Steigenberger, Sebastian
578ce9c1-b74a-4a8a-8ea5-96a829e685ba
Marsay, Chris M.
67edb4d5-3772-4a8e-bd71-cfdffd90efa2
Le Moigne, Frederic A.C.
f809fb0e-04ac-46fb-aae8-e04326555d7e
Painter, Stuart C.
29e32f35-4ee8-4654-b305-4dbe5a312295
Baker, Alex R.
602db22e-cdda-4125-ad53-0336ad38fb9d
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Moore, C. Mark
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Tagliabue, Alessandro
23ecb1dd-3cf4-46eb-b059-637a04f2439b
Tanhua, Toste
b2f4af95-17a8-4aab-a2c9-047c162b9f2c
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Steigenberger, Sebastian
578ce9c1-b74a-4a8a-8ea5-96a829e685ba
Marsay, Chris M.
67edb4d5-3772-4a8e-bd71-cfdffd90efa2
Le Moigne, Frederic A.C.
f809fb0e-04ac-46fb-aae8-e04326555d7e
Painter, Stuart C.
29e32f35-4ee8-4654-b305-4dbe5a312295
Baker, Alex R.
602db22e-cdda-4125-ad53-0336ad38fb9d
Connelly, Douglas P.
d49131bb-af38-4768-9953-7ae0b43e33c8
Moore, C. Mark
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Tagliabue, Alessandro
23ecb1dd-3cf4-46eb-b059-637a04f2439b
Tanhua, Toste
b2f4af95-17a8-4aab-a2c9-047c162b9f2c

Achterberg, Eric P., Steigenberger, Sebastian, Marsay, Chris M., Le Moigne, Frederic A.C., Painter, Stuart C., Baker, Alex R., Connelly, Douglas P., Moore, C. Mark, Tagliabue, Alessandro and Tanhua, Toste (2018) Iron biogeochemistry in the high latitude North Atlantic Ocean Scientific Reports, 8 (doi:10.1038/s41598-018-19472-1).

Record type: Article

Abstract

Iron (Fe) is an essential micronutrient for marine microbial organisms, and low supply controls productivity in large parts of the world’s ocean. The high latitude North Atlantic is seasonally Fe limited, but Fe distributions and source strengths are poorly constrained. Surface ocean dissolved Fe (DFe) concentrations were low in the study region (<0.1 nM) in summer 2010, with significant perturbations during spring 2010 in the Iceland Basin as a result of an eruption of the Eyjafjallajökull volcano (up to 2.5 nM DFe near Iceland) with biogeochemical consequences. Deep water concentrations in the vicinity of the Reykjanes Ridge system were influenced by pronounced sediment resuspension, with indications for additional inputs by hydrothermal vents, with subsequent lateral transport of Fe and manganese plumes of up to 250–300 km. Particulate Fe formed the dominant pool, as evidenced by 4–17 fold higher total dissolvable Fe compared with DFe concentrations, and a dynamic exchange between the fractions appeared to buffer deep water DFe. Here we show that Fe supply associated with deep winter mixing (up to 103 nmol m−2 d−1) was at least ca. 4–10 times higher than atmospheric deposition, diffusive fluxes at the base of the summer mixed layer, and horizontal surface ocean fluxes.

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Accepted/In Press date: 2 January 2018
Published date: 19 January 2018

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Local EPrints ID: 417161
URI: https://eprints.soton.ac.uk/id/eprint/417161
ISSN: 2045-2322
PURE UUID: 1c38cab4-168b-4a53-b51c-97c358a481cb

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Date deposited: 23 Jan 2018 17:30
Last modified: 30 Jan 2018 17:30

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Contributors

Author: Sebastian Steigenberger
Author: Chris M. Marsay
Author: Frederic A.C. Le Moigne
Author: Stuart C. Painter
Author: Alex R. Baker
Author: Douglas P. Connelly
Author: C. Mark Moore
Author: Alessandro Tagliabue
Author: Toste Tanhua

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