Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements
Accurate description of snow and firn processes is necessary for estimating the fraction of glacier surface melt that contributes to runoff. Most processes in snow and firn are to a great extent controlled by the temperature therein and in the absence of liquid water, the temperature evolution is do...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00001463 2023-05-15T16:22:13+02:00 Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements Marchenko, Sergey Cheng, Gong Lötstedt, Per Pohjola, Veijo Pettersson, Rickard van Pelt, Ward Reijmer, Carleen 2019-07 electronic https://doi.org/10.5194/tc-13-1843-2019 https://noa.gwlb.de/receive/cop_mods_00001463 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00001424/tc-13-1843-2019.pdf https://tc.copernicus.org/articles/13/1843/2019/tc-13-1843-2019.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-1843-2019 https://noa.gwlb.de/receive/cop_mods_00001463 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00001424/tc-13-1843-2019.pdf https://tc.copernicus.org/articles/13/1843/2019/tc-13-1843-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/tc-13-1843-2019 2022-02-08T23:01:51Z Accurate description of snow and firn processes is necessary for estimating the fraction of glacier surface melt that contributes to runoff. Most processes in snow and firn are to a great extent controlled by the temperature therein and in the absence of liquid water, the temperature evolution is dominated by the conductive heat exchange. The latter is controlled by the effective thermal conductivity k. Here we reconstruct the effective thermal conductivity of firn at Lomonosovfonna, Svalbard, using an optimization routine minimizing the misfit between simulated and measured subsurface temperatures and densities. The optimized k* values in the range from 0.2 to 1.6 W (m K)−1 increase downwards and over time. The results are supported by uncertainty quantification experiments, according to which k* is most sensitive to systematic errors in empirical temperature values and their estimated depths, particularly in the lower part of the vertical profile. Compared to commonly used density-based parameterizations, our k values are consistently larger, suggesting a faster conductive heat exchange in firn. Article in Journal/Newspaper glacier Svalbard The Cryosphere Niedersächsisches Online-Archiv NOA Lomonosovfonna ENVELOPE(17.663,17.663,78.774,78.774) Svalbard The Cryosphere 13 7 1843 1859 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Marchenko, Sergey Cheng, Gong Lötstedt, Per Pohjola, Veijo Pettersson, Rickard van Pelt, Ward Reijmer, Carleen Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements |
topic_facet |
article Verlagsveröffentlichung |
description |
Accurate description of snow and firn processes is necessary for estimating the fraction of glacier surface melt that contributes to runoff. Most processes in snow and firn are to a great extent controlled by the temperature therein and in the absence of liquid water, the temperature evolution is dominated by the conductive heat exchange. The latter is controlled by the effective thermal conductivity k. Here we reconstruct the effective thermal conductivity of firn at Lomonosovfonna, Svalbard, using an optimization routine minimizing the misfit between simulated and measured subsurface temperatures and densities. The optimized k* values in the range from 0.2 to 1.6 W (m K)−1 increase downwards and over time. The results are supported by uncertainty quantification experiments, according to which k* is most sensitive to systematic errors in empirical temperature values and their estimated depths, particularly in the lower part of the vertical profile. Compared to commonly used density-based parameterizations, our k values are consistently larger, suggesting a faster conductive heat exchange in firn. |
format |
Article in Journal/Newspaper |
author |
Marchenko, Sergey Cheng, Gong Lötstedt, Per Pohjola, Veijo Pettersson, Rickard van Pelt, Ward Reijmer, Carleen |
author_facet |
Marchenko, Sergey Cheng, Gong Lötstedt, Per Pohjola, Veijo Pettersson, Rickard van Pelt, Ward Reijmer, Carleen |
author_sort |
Marchenko, Sergey |
title |
Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements |
title_short |
Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements |
title_full |
Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements |
title_fullStr |
Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements |
title_full_unstemmed |
Thermal conductivity of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements |
title_sort |
thermal conductivity of firn at lomonosovfonna, svalbard, derived from subsurface temperature measurements |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-1843-2019 https://noa.gwlb.de/receive/cop_mods_00001463 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00001424/tc-13-1843-2019.pdf https://tc.copernicus.org/articles/13/1843/2019/tc-13-1843-2019.pdf |
long_lat |
ENVELOPE(17.663,17.663,78.774,78.774) |
geographic |
Lomonosovfonna Svalbard |
geographic_facet |
Lomonosovfonna Svalbard |
genre |
glacier Svalbard The Cryosphere |
genre_facet |
glacier Svalbard The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-1843-2019 https://noa.gwlb.de/receive/cop_mods_00001463 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00001424/tc-13-1843-2019.pdf https://tc.copernicus.org/articles/13/1843/2019/tc-13-1843-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-13-1843-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
7 |
container_start_page |
1843 |
op_container_end_page |
1859 |
_version_ |
1766010193789845504 |