Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet
Surface melt from the Greenland Ice Sheet (GrIS) collects particulate organic carbon (POC) as it drains into subglacial environments and transports it downstream where it serves as a microbial substrate. We hypothesized that older POC is entrained by meltwaters as the subglacial drainage network exp...
Published in: | Geophysical Research Letters |
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Language: | English |
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2017
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Online Access: | https://eprints.soton.ac.uk/413334/ https://eprints.soton.ac.uk/413334/1/Kohler_et_al_2017_Geophysical_Research_Letters.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:413334 2023-07-30T04:03:49+02:00 Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet Kohler, T.J. Žárský, J.D. Yde, J.C. Lamarche-Gagnon, G. Hawkings, J.R. Tedstone, A.J. Wadham, J.L. Box, J.E. Beaton, A.D. 2017-06-28 text https://eprints.soton.ac.uk/413334/ https://eprints.soton.ac.uk/413334/1/Kohler_et_al_2017_Geophysical_Research_Letters.pdf en English eng https://eprints.soton.ac.uk/413334/1/Kohler_et_al_2017_Geophysical_Research_Letters.pdf Kohler, T.J., Žárský, J.D., Yde, J.C., Lamarche-Gagnon, G., Hawkings, J.R., Tedstone, A.J., Wadham, J.L., Box, J.E. and Beaton, A.D. (2017) Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet. Geophysical Research Letters, 44 (12), 6209–6217. (doi:10.1002/2017GL073219 <http://dx.doi.org/10.1002/2017GL073219>). Article PeerReviewed 2017 ftsouthampton https://doi.org/10.1002/2017GL073219 2023-07-09T22:17:12Z Surface melt from the Greenland Ice Sheet (GrIS) collects particulate organic carbon (POC) as it drains into subglacial environments and transports it downstream where it serves as a microbial substrate. We hypothesized that older POC is entrained by meltwaters as the subglacial drainage network expands upglacier over the summer. To test this, POC samples were collected from a meltwater river exiting the GrIS over an ablation season and 14C dated. Resulting values were compared with meltwater hydrochemistry and satellite observations of the catchment area. We found that POC ages increased from ~5000 to ~9000 years B.P. until peak discharge and catchment size. Afterward, significant fluctuations in POC age were observed, interpreted to result from periods of high and low subglacial hydrological pressure and sediment supply and subsequent exhaustion. These observations suggest a seasonal progression in the source of POC exported from the GrIS and provide evidence for a seasonally evolving subglacial drainage system. Article in Journal/Newspaper Greenland Ice Sheet University of Southampton: e-Prints Soton Greenland Geophysical Research Letters 44 12 6209 6217 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Surface melt from the Greenland Ice Sheet (GrIS) collects particulate organic carbon (POC) as it drains into subglacial environments and transports it downstream where it serves as a microbial substrate. We hypothesized that older POC is entrained by meltwaters as the subglacial drainage network expands upglacier over the summer. To test this, POC samples were collected from a meltwater river exiting the GrIS over an ablation season and 14C dated. Resulting values were compared with meltwater hydrochemistry and satellite observations of the catchment area. We found that POC ages increased from ~5000 to ~9000 years B.P. until peak discharge and catchment size. Afterward, significant fluctuations in POC age were observed, interpreted to result from periods of high and low subglacial hydrological pressure and sediment supply and subsequent exhaustion. These observations suggest a seasonal progression in the source of POC exported from the GrIS and provide evidence for a seasonally evolving subglacial drainage system. |
format |
Article in Journal/Newspaper |
author |
Kohler, T.J. Žárský, J.D. Yde, J.C. Lamarche-Gagnon, G. Hawkings, J.R. Tedstone, A.J. Wadham, J.L. Box, J.E. Beaton, A.D. |
spellingShingle |
Kohler, T.J. Žárský, J.D. Yde, J.C. Lamarche-Gagnon, G. Hawkings, J.R. Tedstone, A.J. Wadham, J.L. Box, J.E. Beaton, A.D. Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet |
author_facet |
Kohler, T.J. Žárský, J.D. Yde, J.C. Lamarche-Gagnon, G. Hawkings, J.R. Tedstone, A.J. Wadham, J.L. Box, J.E. Beaton, A.D. |
author_sort |
Kohler, T.J. |
title |
Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet |
title_short |
Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet |
title_full |
Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet |
title_fullStr |
Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet |
title_full_unstemmed |
Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet |
title_sort |
carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the greenland ice sheet |
publishDate |
2017 |
url |
https://eprints.soton.ac.uk/413334/ https://eprints.soton.ac.uk/413334/1/Kohler_et_al_2017_Geophysical_Research_Letters.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
https://eprints.soton.ac.uk/413334/1/Kohler_et_al_2017_Geophysical_Research_Letters.pdf Kohler, T.J., Žárský, J.D., Yde, J.C., Lamarche-Gagnon, G., Hawkings, J.R., Tedstone, A.J., Wadham, J.L., Box, J.E. and Beaton, A.D. (2017) Carbon dating reveals a seasonal progression in the source of particulate organic carbon exported from the Greenland Ice Sheet. Geophysical Research Letters, 44 (12), 6209–6217. (doi:10.1002/2017GL073219 <http://dx.doi.org/10.1002/2017GL073219>). |
op_doi |
https://doi.org/10.1002/2017GL073219 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
12 |
container_start_page |
6209 |
op_container_end_page |
6217 |
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1772814919386791936 |