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Trace element biogeochemistry in the high latitude North Atlantic Ocean: seasonal variations and volcanic inputs

Trace element biogeochemistry in the high latitude North Atlantic Ocean: seasonal variations and volcanic inputs
Trace element biogeochemistry in the high latitude North Atlantic Ocean: seasonal variations and volcanic inputs
We present dissolved and total dissolvable trace elements for spring and summer cruises in 2010 in the high latitude North Atlantic. Surface and full depth data are provided for Al, Cd, Co, Cu, Mn, Ni, Pb, Zn in the Iceland and Irminger Basins, and consequences of biological uptake and inputs by the spring Eyjafjallajökull volcanic eruption are assessed. Ash from Eyjafjallajökull resulted in pronounced increases in Al, Mn and Zn in surface waters in close proximity to Iceland during the eruption, whilst 3 months later during the summer cruise levels had returned to more typical values for the region. The apparent seasonal removal ratios of surface trace elements were consistent with biological export. Assessment of supply of trace elements to the surface mixed layer for the region, excluding volcanic inputs, indicated that deep winter mixing was the dominant source, with diffusive mixing being a minor source (between 13.5% (dissolved Cd (DCd)) and ‐2.43% (DZn) of deep winter flux), and atmospheric inputs being an important source only for DAl and DZn (DAl up to 42% and DZn up to 4.2% of deep winter+diffusive fluxes) and typically less than 1% for the other elements. Elemental supply ratios to the surface mixed layer through convection were comparable to apparent removal ratios we calculated between spring and summer. Given that deep mixing dominated nutrient and trace element supply to surface waters, predicted increases in water column stratification in this region may reduce supply, with potential consequences for primary production and the biological carbon pump.
0886-6236
Achterberg, Eric P.
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Steigenberger, Sebastian
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Klar, Jessica K.
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Browning, Thomas J.
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Marsay, Chris M.
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Painter, Stuart C.
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Vieira, Lúcia H.
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Baker, Alex R.
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Hamilton, Douglas S.
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Tanhua, Toste
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Moore, C. Mark
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Achterberg, Eric P.
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Steigenberger, Sebastian
578ce9c1-b74a-4a8a-8ea5-96a829e685ba
Klar, Jessica K.
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Browning, Thomas J.
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Marsay, Chris M.
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Painter, Stuart C.
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Vieira, Lúcia H.
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Baker, Alex R.
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Hamilton, Douglas S.
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Tanhua, Toste
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Moore, C. Mark
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Achterberg, Eric P., Steigenberger, Sebastian, Klar, Jessica K., Browning, Thomas J., Marsay, Chris M., Painter, Stuart C., Vieira, Lúcia H., Baker, Alex R., Hamilton, Douglas S., Tanhua, Toste and Moore, C. Mark (2020) Trace element biogeochemistry in the high latitude North Atlantic Ocean: seasonal variations and volcanic inputs. Global Biogeochemical Cycles, [e2020GB006674]. (doi:10.1029/2020GB006674).

Record type: Article

Abstract

We present dissolved and total dissolvable trace elements for spring and summer cruises in 2010 in the high latitude North Atlantic. Surface and full depth data are provided for Al, Cd, Co, Cu, Mn, Ni, Pb, Zn in the Iceland and Irminger Basins, and consequences of biological uptake and inputs by the spring Eyjafjallajökull volcanic eruption are assessed. Ash from Eyjafjallajökull resulted in pronounced increases in Al, Mn and Zn in surface waters in close proximity to Iceland during the eruption, whilst 3 months later during the summer cruise levels had returned to more typical values for the region. The apparent seasonal removal ratios of surface trace elements were consistent with biological export. Assessment of supply of trace elements to the surface mixed layer for the region, excluding volcanic inputs, indicated that deep winter mixing was the dominant source, with diffusive mixing being a minor source (between 13.5% (dissolved Cd (DCd)) and ‐2.43% (DZn) of deep winter flux), and atmospheric inputs being an important source only for DAl and DZn (DAl up to 42% and DZn up to 4.2% of deep winter+diffusive fluxes) and typically less than 1% for the other elements. Elemental supply ratios to the surface mixed layer through convection were comparable to apparent removal ratios we calculated between spring and summer. Given that deep mixing dominated nutrient and trace element supply to surface waters, predicted increases in water column stratification in this region may reduce supply, with potential consequences for primary production and the biological carbon pump.

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2020GB006674 - Accepted Manuscript
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Accepted/In Press date: 13 November 2020
e-pub ahead of print date: 25 November 2020

Identifiers

Local EPrints ID: 446009
URI: http://eprints.soton.ac.uk/id/eprint/446009
ISSN: 0886-6236
PURE UUID: 8c97729e-d480-44fd-b2b2-6326f4f33a20
ORCID for C. Mark Moore: ORCID iD orcid.org/0000-0002-9541-6046

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Date deposited: 19 Jan 2021 17:30
Last modified: 26 Nov 2021 02:42

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Contributors

Author: Sebastian Steigenberger
Author: Jessica K. Klar
Author: Thomas J. Browning
Author: Chris M. Marsay
Author: Stuart C. Painter
Author: Lúcia H. Vieira
Author: Alex R. Baker
Author: Douglas S. Hamilton
Author: Toste Tanhua
Author: C. Mark Moore ORCID iD

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