The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic
The contribution of ice sheets to the global biogeochemical cycle of phosphorus is largely unknown, due to the lack of field data. Here, we present the first comprehensive study of phosphorus export from two Greenland Ice Sheet glaciers. Our results indicate that the ice sheet is a hot spot of phosp...
Published in: | Global Biogeochemical Cycles |
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2016
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Online Access: | https://pure.au.dk/portal/da/publications/the-greenland-ice-sheet-as-a-hot-spot-of-phosphorus-weathering-and-export-in-the-arctic(d4e90c70-c7d2-400c-a167-6d916f6e8aba).html https://doi.org/10.1002/2015GB005237 |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/d4e90c70-c7d2-400c-a167-6d916f6e8aba 2023-05-15T14:26:00+02:00 The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic Hawkings, Jon Wadham, Jemma Tranter, Martyn Telling, Jon Bagshaw, Elizabeth Beaton, Alexander Simmons, Sarah-Louise Chandler, David Tedstone, Andrew Nienow, Peter 2016-01-13 https://pure.au.dk/portal/da/publications/the-greenland-ice-sheet-as-a-hot-spot-of-phosphorus-weathering-and-export-in-the-arctic(d4e90c70-c7d2-400c-a167-6d916f6e8aba).html https://doi.org/10.1002/2015GB005237 eng eng info:eu-repo/semantics/restrictedAccess Hawkings , J , Wadham , J , Tranter , M , Telling , J , Bagshaw , E , Beaton , A , Simmons , S-L , Chandler , D , Tedstone , A & Nienow , P 2016 , ' The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic ' , Global Biogeochemical Cycles , vol. 30 , no. 2 , pp. 191-210 . https://doi.org/10.1002/2015GB005237 article 2016 ftuniaarhuspubl https://doi.org/10.1002/2015GB005237 2023-02-15T23:56:02Z The contribution of ice sheets to the global biogeochemical cycle of phosphorus is largely unknown, due to the lack of field data. Here, we present the first comprehensive study of phosphorus export from two Greenland Ice Sheet glaciers. Our results indicate that the ice sheet is a hot spot of phosphorus export in the Arctic. Soluble reactive phosphorus (SRP) concentrations, up to 0.35 μM, are similar to those observed in Arctic rivers. Yields of SRP are among the highest in the literature, with denudation rates of 17–27 kg P km−2 year−1. Particulate phases, as with non-glaciated catchments, dominate phosphorus export (>97 % of total phosphorus flux). The labile particulate fraction differs between the two glaciers studied, with significantly higher yields found at the larger glacier (57.3 versus 8.3 kg P km−2 year−1). Total phosphorus yields are an order of magnitude higher than riverine values reported in the literature. We estimate that the ice sheet contributes ~15 % of total bioavailable phosphorus input to the Arctic oceans (~11 Gg year−1), and dominates total phosphorus input (408 Gg year−1), which is more than three times that estimated from Arctic rivers (126 Gg year−1). We predict that these fluxes will rise with increasing ice sheet freshwater discharge in the future. Article in Journal/Newspaper Arctic Arctic glacier Greenland Ice Sheet Aarhus University: Research Arctic Greenland Global Biogeochemical Cycles 30 2 191 210 |
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Open Polar |
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Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
The contribution of ice sheets to the global biogeochemical cycle of phosphorus is largely unknown, due to the lack of field data. Here, we present the first comprehensive study of phosphorus export from two Greenland Ice Sheet glaciers. Our results indicate that the ice sheet is a hot spot of phosphorus export in the Arctic. Soluble reactive phosphorus (SRP) concentrations, up to 0.35 μM, are similar to those observed in Arctic rivers. Yields of SRP are among the highest in the literature, with denudation rates of 17–27 kg P km−2 year−1. Particulate phases, as with non-glaciated catchments, dominate phosphorus export (>97 % of total phosphorus flux). The labile particulate fraction differs between the two glaciers studied, with significantly higher yields found at the larger glacier (57.3 versus 8.3 kg P km−2 year−1). Total phosphorus yields are an order of magnitude higher than riverine values reported in the literature. We estimate that the ice sheet contributes ~15 % of total bioavailable phosphorus input to the Arctic oceans (~11 Gg year−1), and dominates total phosphorus input (408 Gg year−1), which is more than three times that estimated from Arctic rivers (126 Gg year−1). We predict that these fluxes will rise with increasing ice sheet freshwater discharge in the future. |
format |
Article in Journal/Newspaper |
author |
Hawkings, Jon Wadham, Jemma Tranter, Martyn Telling, Jon Bagshaw, Elizabeth Beaton, Alexander Simmons, Sarah-Louise Chandler, David Tedstone, Andrew Nienow, Peter |
spellingShingle |
Hawkings, Jon Wadham, Jemma Tranter, Martyn Telling, Jon Bagshaw, Elizabeth Beaton, Alexander Simmons, Sarah-Louise Chandler, David Tedstone, Andrew Nienow, Peter The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic |
author_facet |
Hawkings, Jon Wadham, Jemma Tranter, Martyn Telling, Jon Bagshaw, Elizabeth Beaton, Alexander Simmons, Sarah-Louise Chandler, David Tedstone, Andrew Nienow, Peter |
author_sort |
Hawkings, Jon |
title |
The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic |
title_short |
The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic |
title_full |
The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic |
title_fullStr |
The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic |
title_full_unstemmed |
The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic |
title_sort |
greenland ice sheet as a hot spot of phosphorus weathering and export in the arctic |
publishDate |
2016 |
url |
https://pure.au.dk/portal/da/publications/the-greenland-ice-sheet-as-a-hot-spot-of-phosphorus-weathering-and-export-in-the-arctic(d4e90c70-c7d2-400c-a167-6d916f6e8aba).html https://doi.org/10.1002/2015GB005237 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic glacier Greenland Ice Sheet |
genre_facet |
Arctic Arctic glacier Greenland Ice Sheet |
op_source |
Hawkings , J , Wadham , J , Tranter , M , Telling , J , Bagshaw , E , Beaton , A , Simmons , S-L , Chandler , D , Tedstone , A & Nienow , P 2016 , ' The Greenland Ice Sheet as a hot spot of phosphorus weathering and export in the Arctic ' , Global Biogeochemical Cycles , vol. 30 , no. 2 , pp. 191-210 . https://doi.org/10.1002/2015GB005237 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/2015GB005237 |
container_title |
Global Biogeochemical Cycles |
container_volume |
30 |
container_issue |
2 |
container_start_page |
191 |
op_container_end_page |
210 |
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1766298484818837504 |