Weathering Dynamics Under Contrasting Greenland Ice Sheet Catchments
Chemical weathering dynamics in Greenland Ice Sheet (GrIS) catchments are largely unknown, due to a scarcity of field data. This paper presents the most comprehensive study to date of chemical weathering rates from four GrIS catchments of contrasting size. Cationic denudation rates varied greatly be...
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Online Access: | https://hdl.handle.net/11250/2648836 https://doi.org/10.3389/feart.2019.00299 |
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fthsvestlandet:oai:hvlopen.brage.unit.no:11250/2648836 2024-03-03T08:44:57+00:00 Weathering Dynamics Under Contrasting Greenland Ice Sheet Catchments Urra, Alexandra Wadham, Jemma L. Hawkings, Jon R. Telling, Jon Hatton, Jade E. Yde, Jacob C. Hasholt, Bent van As, Dirk Bhatia, Maya P. Nienow, Peter W. Greenland 2019 application/pdf https://hdl.handle.net/11250/2648836 https://doi.org/10.3389/feart.2019.00299 eng eng Frontiers Media S.A. Urra, A., Wadham, J., Hawkings, J. R., Telling, J., Hatton, J. E., Yde, J. C., . . . Nienow, P. (2019). Weathering dynamics under contrasting greenland ice sheet catchments. Frontiers in Earth Science, 7. urn:issn:2296-6463 https://hdl.handle.net/11250/2648836 https://doi.org/10.3389/feart.2019.00299 cristin:1771949 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright © 2019 Urra, Wadham, Hawkings, Telling, Hatton, Yde, Hasholt, van As, Bhatia and Nienow. 15 7 Frontiers in Earth Science ice sheet glaciers solute fluxes cations silica weathering Peer reviewed Journal article 2019 fthsvestlandet https://doi.org/10.3389/feart.2019.00299 2024-02-02T12:41:09Z Chemical weathering dynamics in Greenland Ice Sheet (GrIS) catchments are largely unknown, due to a scarcity of field data. This paper presents the most comprehensive study to date of chemical weathering rates from four GrIS catchments of contrasting size. Cationic denudation rates varied greatly between catchments studied (2.6–37.6 tons km–2 a–1, world mean = 11.9 tons km–2 a–1), but were of the same order of magnitude to the world non-glacial riverine mean, and are greater than those documented in some major temperate rivers catchments (e.g., Mississippi (1.3 tons km–2 a–1) and Nile (0.4 tons km–2 a–1) rivers). These high chemical denudation rates indicate that the GrIS is a potential source of solute to downstream environments. Dissolved silica yields, indicative of silicate weathering rates, also varied by an order of magnitude, with upper values similar to the world mean (0.2–3.8 tons km–2 a–1, world mean = 3.53 tons km–2 a–1). Elevated chemical weathering rates in GrIS catchments are strongly influenced by the specific discharge, which drives flushing of the subglacial environment and physical erosion of the ice sheet bed. The direct relationship between specific discharge and chemical denudation rates supports the hypothesis that GrIS chemical weathering rates and solute fluxes are likely to increase with enhanced melt rates in a warming climate. publishedVersion Article in Journal/Newspaper Greenland Ice Sheet Høgskulen på Vestlandet: HVL Open Greenland Frontiers in Earth Science 7 |
institution |
Open Polar |
collection |
Høgskulen på Vestlandet: HVL Open |
op_collection_id |
fthsvestlandet |
language |
English |
topic |
ice sheet glaciers solute fluxes cations silica weathering |
spellingShingle |
ice sheet glaciers solute fluxes cations silica weathering Urra, Alexandra Wadham, Jemma L. Hawkings, Jon R. Telling, Jon Hatton, Jade E. Yde, Jacob C. Hasholt, Bent van As, Dirk Bhatia, Maya P. Nienow, Peter W. Weathering Dynamics Under Contrasting Greenland Ice Sheet Catchments |
topic_facet |
ice sheet glaciers solute fluxes cations silica weathering |
description |
Chemical weathering dynamics in Greenland Ice Sheet (GrIS) catchments are largely unknown, due to a scarcity of field data. This paper presents the most comprehensive study to date of chemical weathering rates from four GrIS catchments of contrasting size. Cationic denudation rates varied greatly between catchments studied (2.6–37.6 tons km–2 a–1, world mean = 11.9 tons km–2 a–1), but were of the same order of magnitude to the world non-glacial riverine mean, and are greater than those documented in some major temperate rivers catchments (e.g., Mississippi (1.3 tons km–2 a–1) and Nile (0.4 tons km–2 a–1) rivers). These high chemical denudation rates indicate that the GrIS is a potential source of solute to downstream environments. Dissolved silica yields, indicative of silicate weathering rates, also varied by an order of magnitude, with upper values similar to the world mean (0.2–3.8 tons km–2 a–1, world mean = 3.53 tons km–2 a–1). Elevated chemical weathering rates in GrIS catchments are strongly influenced by the specific discharge, which drives flushing of the subglacial environment and physical erosion of the ice sheet bed. The direct relationship between specific discharge and chemical denudation rates supports the hypothesis that GrIS chemical weathering rates and solute fluxes are likely to increase with enhanced melt rates in a warming climate. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Urra, Alexandra Wadham, Jemma L. Hawkings, Jon R. Telling, Jon Hatton, Jade E. Yde, Jacob C. Hasholt, Bent van As, Dirk Bhatia, Maya P. Nienow, Peter W. |
author_facet |
Urra, Alexandra Wadham, Jemma L. Hawkings, Jon R. Telling, Jon Hatton, Jade E. Yde, Jacob C. Hasholt, Bent van As, Dirk Bhatia, Maya P. Nienow, Peter W. |
author_sort |
Urra, Alexandra |
title |
Weathering Dynamics Under Contrasting Greenland Ice Sheet Catchments |
title_short |
Weathering Dynamics Under Contrasting Greenland Ice Sheet Catchments |
title_full |
Weathering Dynamics Under Contrasting Greenland Ice Sheet Catchments |
title_fullStr |
Weathering Dynamics Under Contrasting Greenland Ice Sheet Catchments |
title_full_unstemmed |
Weathering Dynamics Under Contrasting Greenland Ice Sheet Catchments |
title_sort |
weathering dynamics under contrasting greenland ice sheet catchments |
publisher |
Frontiers Media S.A. |
publishDate |
2019 |
url |
https://hdl.handle.net/11250/2648836 https://doi.org/10.3389/feart.2019.00299 |
op_coverage |
Greenland |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
15 7 Frontiers in Earth Science |
op_relation |
Urra, A., Wadham, J., Hawkings, J. R., Telling, J., Hatton, J. E., Yde, J. C., . . . Nienow, P. (2019). Weathering dynamics under contrasting greenland ice sheet catchments. Frontiers in Earth Science, 7. urn:issn:2296-6463 https://hdl.handle.net/11250/2648836 https://doi.org/10.3389/feart.2019.00299 cristin:1771949 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright © 2019 Urra, Wadham, Hawkings, Telling, Hatton, Yde, Hasholt, van As, Bhatia and Nienow. |
op_doi |
https://doi.org/10.3389/feart.2019.00299 |
container_title |
Frontiers in Earth Science |
container_volume |
7 |
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1792500474188922880 |