Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet
We present in situ firn temperatures from the extreme 2012 melt season in the southwestern lower accumulation area of the Greenland ice sheet. The upper 2.5 m of snow and firn was temperate during the melt season, when vertical meltwater percolation was inefficient due to a ~5.5 m thick ice layer un...
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International Glaciological Society
2016
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ftunivzuerich:oai:www.zora.uzh.ch:126149 2024-09-30T14:22:48+00:00 Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet Charalampidis, Charalampos van As, Dirk Colgan, William T Fausto, Robert S Macferrin, Michael Machguth, Horst 2016 application/pdf https://www.zora.uzh.ch/id/eprint/126149/ https://www.zora.uzh.ch/id/eprint/126149/1/charalampidis_AG_2016.pdf https://doi.org/10.5167/uzh-126149 https://doi.org/10.1017/aog.2016.2 eng eng International Glaciological Society https://www.zora.uzh.ch/id/eprint/126149/1/charalampidis_AG_2016.pdf doi:10.5167/uzh-126149 doi:10.1017/aog.2016.2 urn:issn:0260-3055 info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ Charalampidis, Charalampos; van As, Dirk; Colgan, William T; Fausto, Robert S; Macferrin, Michael; Machguth, Horst (2016). Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet. Annals of Glaciology, 57(72):1-10. Institute of Geography 910 Geography & travel Journal Article PeerReviewed info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftunivzuerich https://doi.org/10.5167/uzh-12614910.1017/aog.2016.2 2024-09-18T00:49:48Z We present in situ firn temperatures from the extreme 2012 melt season in the southwestern lower accumulation area of the Greenland ice sheet. The upper 2.5 m of snow and firn was temperate during the melt season, when vertical meltwater percolation was inefficient due to a ~5.5 m thick ice layer underlying the temperate firn. Meltwater percolation and refreezing beneath 2.5 m depth only occurred after the melt season. Deviations from temperatures predicted by pure conductivity suggest that meltwater refroze in discrete bands at depths of 2.0–2.5, 5.0–6.0 and 8.0–9.0 m. While we find no indication of meltwater percolation below 9 m depth or complete filling of pore volume above, firn at 10 and 15 m depth was respectively 4.2–4.5°C and 1.7°C higher than in a conductivity-only simulation. Even though meltwater percolation in 2012 was inefficient, firn between 2 and 15 m depth the following winter was on average 4.7°C warmer due to meltwater refreezing. Our observations also suggest that the 2012 firn conditions were preconditioned by two warm summers and ice layer formation in 2010 and 2011. Overall, firn temperatures during the years 2009–13 increased by 0.6°C. Article in Journal/Newspaper Annals of Glaciology Greenland Ice Sheet University of Zurich (UZH): ZORA (Zurich Open Repository and Archive Greenland |
institution |
Open Polar |
collection |
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive |
op_collection_id |
ftunivzuerich |
language |
English |
topic |
Institute of Geography 910 Geography & travel |
spellingShingle |
Institute of Geography 910 Geography & travel Charalampidis, Charalampos van As, Dirk Colgan, William T Fausto, Robert S Macferrin, Michael Machguth, Horst Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet |
topic_facet |
Institute of Geography 910 Geography & travel |
description |
We present in situ firn temperatures from the extreme 2012 melt season in the southwestern lower accumulation area of the Greenland ice sheet. The upper 2.5 m of snow and firn was temperate during the melt season, when vertical meltwater percolation was inefficient due to a ~5.5 m thick ice layer underlying the temperate firn. Meltwater percolation and refreezing beneath 2.5 m depth only occurred after the melt season. Deviations from temperatures predicted by pure conductivity suggest that meltwater refroze in discrete bands at depths of 2.0–2.5, 5.0–6.0 and 8.0–9.0 m. While we find no indication of meltwater percolation below 9 m depth or complete filling of pore volume above, firn at 10 and 15 m depth was respectively 4.2–4.5°C and 1.7°C higher than in a conductivity-only simulation. Even though meltwater percolation in 2012 was inefficient, firn between 2 and 15 m depth the following winter was on average 4.7°C warmer due to meltwater refreezing. Our observations also suggest that the 2012 firn conditions were preconditioned by two warm summers and ice layer formation in 2010 and 2011. Overall, firn temperatures during the years 2009–13 increased by 0.6°C. |
format |
Article in Journal/Newspaper |
author |
Charalampidis, Charalampos van As, Dirk Colgan, William T Fausto, Robert S Macferrin, Michael Machguth, Horst |
author_facet |
Charalampidis, Charalampos van As, Dirk Colgan, William T Fausto, Robert S Macferrin, Michael Machguth, Horst |
author_sort |
Charalampidis, Charalampos |
title |
Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet |
title_short |
Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet |
title_full |
Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet |
title_fullStr |
Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet |
title_full_unstemmed |
Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet |
title_sort |
thermal tracing of retained meltwater in the lower accumulation area of the southwestern greenland ice sheet |
publisher |
International Glaciological Society |
publishDate |
2016 |
url |
https://www.zora.uzh.ch/id/eprint/126149/ https://www.zora.uzh.ch/id/eprint/126149/1/charalampidis_AG_2016.pdf https://doi.org/10.5167/uzh-126149 https://doi.org/10.1017/aog.2016.2 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology Greenland Ice Sheet |
genre_facet |
Annals of Glaciology Greenland Ice Sheet |
op_source |
Charalampidis, Charalampos; van As, Dirk; Colgan, William T; Fausto, Robert S; Macferrin, Michael; Machguth, Horst (2016). Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet. Annals of Glaciology, 57(72):1-10. |
op_relation |
https://www.zora.uzh.ch/id/eprint/126149/1/charalampidis_AG_2016.pdf doi:10.5167/uzh-126149 doi:10.1017/aog.2016.2 urn:issn:0260-3055 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons: Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5167/uzh-12614910.1017/aog.2016.2 |
_version_ |
1811635617430241280 |