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 similar to 5.5 m thick ic...
Published in: | Annals of Glaciology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2016
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Online Access: | https://orbit.dtu.dk/en/publications/a952f34e-2676-46d0-ad78-72cf06d09a93 https://doi.org/10.1017/aog.2016.2 https://backend.orbit.dtu.dk/ws/files/127063467/thermal_tracing_of_retained_meltwater_in_the_lower_accumulation_area_of_the_southwestern_greenland_ice_sheet.pdf https://backend.orbit.dtu.dk/ws/files/132273157/thermal_tracing_of_retained_meltwater_in_the_lower_accumulation_area_of_the_southwestern_greenland_ice_sheet.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/a952f34e-2676-46d0-ad78-72cf06d09a93 2024-09-15T17:39:58+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://orbit.dtu.dk/en/publications/a952f34e-2676-46d0-ad78-72cf06d09a93 https://doi.org/10.1017/aog.2016.2 https://backend.orbit.dtu.dk/ws/files/127063467/thermal_tracing_of_retained_meltwater_in_the_lower_accumulation_area_of_the_southwestern_greenland_ice_sheet.pdf https://backend.orbit.dtu.dk/ws/files/132273157/thermal_tracing_of_retained_meltwater_in_the_lower_accumulation_area_of_the_southwestern_greenland_ice_sheet.pdf eng eng https://orbit.dtu.dk/en/publications/a952f34e-2676-46d0-ad78-72cf06d09a93 info:eu-repo/semantics/openAccess Charalampidis , C , Van As , D , Colgan , W T , Fausto , R S , Macferrin , M & Machguth , H 2016 , ' Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet ' , Annals of Glaciology , vol. 57 , no. 72 , pp. 1-10 . https://doi.org/10.1017/aog.2016.2 Greenland ice sheet Accumulation area Firn Percolation Refreezing Superimposed ice article 2016 ftdtupubl https://doi.org/10.1017/aog.2016.2 2024-08-05T23:48:29Z 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 similar to 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 ºC and 1.7 ºC 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 degrees 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 ºC. Article in Journal/Newspaper Annals of Glaciology Greenland Ice Sheet Technical University of Denmark: DTU Orbit Annals of Glaciology 57 72 1 10 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Greenland ice sheet Accumulation area Firn Percolation Refreezing Superimposed ice |
spellingShingle |
Greenland ice sheet Accumulation area Firn Percolation Refreezing Superimposed ice 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 |
Greenland ice sheet Accumulation area Firn Percolation Refreezing Superimposed ice |
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 similar to 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 ºC and 1.7 ºC 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 degrees 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 ºC. |
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 |
publishDate |
2016 |
url |
https://orbit.dtu.dk/en/publications/a952f34e-2676-46d0-ad78-72cf06d09a93 https://doi.org/10.1017/aog.2016.2 https://backend.orbit.dtu.dk/ws/files/127063467/thermal_tracing_of_retained_meltwater_in_the_lower_accumulation_area_of_the_southwestern_greenland_ice_sheet.pdf https://backend.orbit.dtu.dk/ws/files/132273157/thermal_tracing_of_retained_meltwater_in_the_lower_accumulation_area_of_the_southwestern_greenland_ice_sheet.pdf |
genre |
Annals of Glaciology Greenland Ice Sheet |
genre_facet |
Annals of Glaciology Greenland Ice Sheet |
op_source |
Charalampidis , C , Van As , D , Colgan , W T , Fausto , R S , Macferrin , M & Machguth , H 2016 , ' Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet ' , Annals of Glaciology , vol. 57 , no. 72 , pp. 1-10 . https://doi.org/10.1017/aog.2016.2 |
op_relation |
https://orbit.dtu.dk/en/publications/a952f34e-2676-46d0-ad78-72cf06d09a93 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/aog.2016.2 |
container_title |
Annals of Glaciology |
container_volume |
57 |
container_issue |
72 |
container_start_page |
1 |
op_container_end_page |
10 |
_version_ |
1810483759139520512 |