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Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans

Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans
Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans
The Greenland and Antarctic Ice Sheets cover ~\n10% of global land surface, but are rarely considered as active components of the global iron cycle. The ocean waters around both ice sheets harbour highly productive coastal ecosystems, many of which are iron limited. Measurements of iron concentrations in subglacial runoff from a large Greenland Ice Sheet catchment reveal the potential for globally significant export of labile iron fractions to the near-coastal euphotic zone. We estimate that the flux of bioavailable iron associated with glacial runoff is 0.40–2.54?Tg per year in Greenland and 0.06–0.17?Tg per year in Antarctica. Iron fluxes are dominated by a highly reactive and potentially bioavailable nanoparticulate suspended sediment fraction, similar to that identified in Antarctic icebergs. Estimates of labile iron fluxes in meltwater are comparable with aeolian dust fluxes to the oceans surrounding Greenland and Antarctica, and are similarly expected to increase in a warming climate with enhanced melting.
3923
Hawkings, Jon R.
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Wadham, Jemma L.
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Tranter, Martyn
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Raiswell, Rob
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Benning, Liane G.
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Statham, Peter J.
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Tedstone, Andrew
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Nienow, Peter
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Lee, Katherine
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Telling, Jon
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Hawkings, Jon R.
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Wadham, Jemma L.
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Tranter, Martyn
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Raiswell, Rob
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Benning, Liane G.
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Statham, Peter J.
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Tedstone, Andrew
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Nienow, Peter
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Lee, Katherine
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Telling, Jon
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Hawkings, Jon R., Wadham, Jemma L., Tranter, Martyn, Raiswell, Rob, Benning, Liane G., Statham, Peter J., Tedstone, Andrew, Nienow, Peter, Lee, Katherine and Telling, Jon (2014) Ice sheets as a significant source of highly reactive nanoparticulate iron to the oceans. Nature Communications, 5, 3923. (doi:10.1038/ncomms4929).

Record type: Article

Abstract

The Greenland and Antarctic Ice Sheets cover ~\n10% of global land surface, but are rarely considered as active components of the global iron cycle. The ocean waters around both ice sheets harbour highly productive coastal ecosystems, many of which are iron limited. Measurements of iron concentrations in subglacial runoff from a large Greenland Ice Sheet catchment reveal the potential for globally significant export of labile iron fractions to the near-coastal euphotic zone. We estimate that the flux of bioavailable iron associated with glacial runoff is 0.40–2.54?Tg per year in Greenland and 0.06–0.17?Tg per year in Antarctica. Iron fluxes are dominated by a highly reactive and potentially bioavailable nanoparticulate suspended sediment fraction, similar to that identified in Antarctic icebergs. Estimates of labile iron fluxes in meltwater are comparable with aeolian dust fluxes to the oceans surrounding Greenland and Antarctica, and are similarly expected to increase in a warming climate with enhanced melting.

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e-pub ahead of print date: 21 May 2014
Published date: May 2014
Organisations: Ocean and Earth Science

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Local EPrints ID: 366785
URI: http://eprints.soton.ac.uk/id/eprint/366785
PURE UUID: 473f1576-c87f-4875-87e9-4d2bd54ff564

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Date deposited: 09 Jul 2014 14:18
Last modified: 02 Dec 2019 20:43

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Contributors

Author: Jon R. Hawkings
Author: Jemma L. Wadham
Author: Martyn Tranter
Author: Rob Raiswell
Author: Liane G. Benning
Author: Andrew Tedstone
Author: Peter Nienow
Author: Katherine Lee
Author: Jon Telling

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