Utility of 222Rn as a passive tracer of subglacial distributed system drainage
The authors acknowledge the following funding sources: U.S. National Science Foundation Arctic Natural Sciences Program (ANS-1256669); Woods Hole Oceanographic Institution Arctic Research Initiative, Ocean Ventures Fund, and Ocean Climate Change Institute; United Kingdom Natural Environment Research...
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/12598 2024-09-15T18:02:29+00:00 Utility of 222Rn as a passive tracer of subglacial distributed system drainage Linhoff, Benjamin S. Charette, Matthew A. Nienow, Peter W. Wadham, Jemma L. Tedstone, Andrew J. Cowton, Tom University of St Andrews.Geography & Sustainable Development University of St Andrews.Bell-Edwards Geographic Data Institute 2018-01-23 9 1754458 application/pdf https://hdl.handle.net/10023/12598 https://doi.org/10.1016/j.epsl.2016.12.039 http://www.sciencedirect.com/science/article/pii/S0012821X1630752X#appd002 eng eng Earth and Planetary Science Letters 248656090 d9618470-7913-4625-a640-3458bfde28dd 85009948870 000395600900017 Linhoff , B S , Charette , M A , Nienow , P W , Wadham , J L , Tedstone , A J & Cowton , T 2017 , ' Utility of 222 Rn as a passive tracer of subglacial distributed system drainage ' , Earth and Planetary Science Letters , vol. 462 , pp. 180-188 . https://doi.org/10.1016/j.epsl.2016.12.039 0012-821X ORCID: /0000-0003-1668-7372/work/60427790 https://hdl.handle.net/10023/12598 doi:10.1016/j.epsl.2016.12.039 http://www.sciencedirect.com/science/article/pii/S0012821X1630752X#appd002 Copyright 2017, Elsevier B.V. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1016/j.epsl.2016.12.039 Radon Greenland Glacier Proglacial river Meltwater GE Environmental Sciences DAS GE Journal article 2018 ftstandrewserep https://doi.org/10.1016/j.epsl.2016.12.039 2024-08-21T00:01:29Z The authors acknowledge the following funding sources: U.S. National Science Foundation Arctic Natural Sciences Program (ANS-1256669); Woods Hole Oceanographic Institution Arctic Research Initiative, Ocean Ventures Fund, and Ocean Climate Change Institute; United Kingdom Natural Environment Research Council studentship (NE/152830X/1); the Carnegie Trust, Edinburgh University Development Trust. Data presented in this study is archived at: www.aoncadis.org/dataset/GrIS_RADON.html. Water flow beneath the Greenland Ice Sheet (GrIS) has been shown to include slow-inefficient (distributed) and fast-efficient (channelized) drainage systems, in response to meltwater delivery to the bed via both moulins and surface lake drainage. This partitioning between channelized and distributed drainage systems is difficult to quantify yet it plays an important role in bulk meltwater chemistry and glacial velocity, and thus subglacial erosion. Radon-222, which is continuously produced via the decay of 226Ra, accumulates in meltwater that has interacted with rock and sediment. Hence, elevated concentrations of 222Rn should be indicative of meltwater that has flowed through a distributed drainage system network. In the spring and summer of 2011 and 2012, we made hourly 222Rn measurements in the proglacial river of a large outlet glacier of the GrIS (Leverett Glacier, SW Greenland). Radon-222 activities were highest in the early melt season (10-15 dpm L-1), decreasing by a factor of 2-5 (3-5 dpm L-1) following the onset of widespread surface melt. Using a 222Rn mass balance model, we estimate that, on average, greater than 90% of the river 222Rn was sourced from distributed system meltwater. The distributed system 222Rn flux varied on diurnal, weekly, and seasonal time scales with highest fluxes generally occurring on the falling limb of the hydrograph and during expansion of the channelized drainage system. Using laboratory based estimates of distributed system 222Rn, the distributed system water flux generally ranged between 1-5% ... Article in Journal/Newspaper Climate change glacier Greenland Ice Sheet Leverett Glacier University of St Andrews: Digital Research Repository Earth and Planetary Science Letters 462 180 188 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Radon Greenland Glacier Proglacial river Meltwater GE Environmental Sciences DAS GE |
spellingShingle |
Radon Greenland Glacier Proglacial river Meltwater GE Environmental Sciences DAS GE Linhoff, Benjamin S. Charette, Matthew A. Nienow, Peter W. Wadham, Jemma L. Tedstone, Andrew J. Cowton, Tom Utility of 222Rn as a passive tracer of subglacial distributed system drainage |
topic_facet |
Radon Greenland Glacier Proglacial river Meltwater GE Environmental Sciences DAS GE |
description |
The authors acknowledge the following funding sources: U.S. National Science Foundation Arctic Natural Sciences Program (ANS-1256669); Woods Hole Oceanographic Institution Arctic Research Initiative, Ocean Ventures Fund, and Ocean Climate Change Institute; United Kingdom Natural Environment Research Council studentship (NE/152830X/1); the Carnegie Trust, Edinburgh University Development Trust. Data presented in this study is archived at: www.aoncadis.org/dataset/GrIS_RADON.html. Water flow beneath the Greenland Ice Sheet (GrIS) has been shown to include slow-inefficient (distributed) and fast-efficient (channelized) drainage systems, in response to meltwater delivery to the bed via both moulins and surface lake drainage. This partitioning between channelized and distributed drainage systems is difficult to quantify yet it plays an important role in bulk meltwater chemistry and glacial velocity, and thus subglacial erosion. Radon-222, which is continuously produced via the decay of 226Ra, accumulates in meltwater that has interacted with rock and sediment. Hence, elevated concentrations of 222Rn should be indicative of meltwater that has flowed through a distributed drainage system network. In the spring and summer of 2011 and 2012, we made hourly 222Rn measurements in the proglacial river of a large outlet glacier of the GrIS (Leverett Glacier, SW Greenland). Radon-222 activities were highest in the early melt season (10-15 dpm L-1), decreasing by a factor of 2-5 (3-5 dpm L-1) following the onset of widespread surface melt. Using a 222Rn mass balance model, we estimate that, on average, greater than 90% of the river 222Rn was sourced from distributed system meltwater. The distributed system 222Rn flux varied on diurnal, weekly, and seasonal time scales with highest fluxes generally occurring on the falling limb of the hydrograph and during expansion of the channelized drainage system. Using laboratory based estimates of distributed system 222Rn, the distributed system water flux generally ranged between 1-5% ... |
author2 |
University of St Andrews.Geography & Sustainable Development University of St Andrews.Bell-Edwards Geographic Data Institute |
format |
Article in Journal/Newspaper |
author |
Linhoff, Benjamin S. Charette, Matthew A. Nienow, Peter W. Wadham, Jemma L. Tedstone, Andrew J. Cowton, Tom |
author_facet |
Linhoff, Benjamin S. Charette, Matthew A. Nienow, Peter W. Wadham, Jemma L. Tedstone, Andrew J. Cowton, Tom |
author_sort |
Linhoff, Benjamin S. |
title |
Utility of 222Rn as a passive tracer of subglacial distributed system drainage |
title_short |
Utility of 222Rn as a passive tracer of subglacial distributed system drainage |
title_full |
Utility of 222Rn as a passive tracer of subglacial distributed system drainage |
title_fullStr |
Utility of 222Rn as a passive tracer of subglacial distributed system drainage |
title_full_unstemmed |
Utility of 222Rn as a passive tracer of subglacial distributed system drainage |
title_sort |
utility of 222rn as a passive tracer of subglacial distributed system drainage |
publishDate |
2018 |
url |
https://hdl.handle.net/10023/12598 https://doi.org/10.1016/j.epsl.2016.12.039 http://www.sciencedirect.com/science/article/pii/S0012821X1630752X#appd002 |
genre |
Climate change glacier Greenland Ice Sheet Leverett Glacier |
genre_facet |
Climate change glacier Greenland Ice Sheet Leverett Glacier |
op_relation |
Earth and Planetary Science Letters 248656090 d9618470-7913-4625-a640-3458bfde28dd 85009948870 000395600900017 Linhoff , B S , Charette , M A , Nienow , P W , Wadham , J L , Tedstone , A J & Cowton , T 2017 , ' Utility of 222 Rn as a passive tracer of subglacial distributed system drainage ' , Earth and Planetary Science Letters , vol. 462 , pp. 180-188 . https://doi.org/10.1016/j.epsl.2016.12.039 0012-821X ORCID: /0000-0003-1668-7372/work/60427790 https://hdl.handle.net/10023/12598 doi:10.1016/j.epsl.2016.12.039 http://www.sciencedirect.com/science/article/pii/S0012821X1630752X#appd002 |
op_rights |
Copyright 2017, Elsevier B.V. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1016/j.epsl.2016.12.039 |
op_doi |
https://doi.org/10.1016/j.epsl.2016.12.039 |
container_title |
Earth and Planetary Science Letters |
container_volume |
462 |
container_start_page |
180 |
op_container_end_page |
188 |
_version_ |
1810439941047451648 |