Thermal conductivity of supraglacial volcanic deposits in Iceland
Supraglacial deposits of tephra or volcaniclastics have the potential to cause significant anomalies of glacier ablation and runoff. The intensity of these anomalies is governed by the thermal resistivity of the covering layer and hence the thermal conductivity of the deposited grains. This study co...
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Humboldt-Universität zu Berlin
2020
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fthuberlin:oai:edoc.hu-berlin.de:18452/27661 2023-12-03T10:22:23+01:00 Thermal conductivity of supraglacial volcanic deposits in Iceland Möller, Rebecca Römer, Wolfgang Möller, Marco Wollenberg, Uwe Lehmkuhl, Frank Schneider, Christoph Kukla, Peter 2020-02-18 application/pdf http://edoc.hu-berlin.de/18452/27661 https://nbn-resolving.org/urn:nbn:de:kobv:11-110-18452/27661-3 https://doi.org/10.1007/s00531-020-01820-0 https://doi.org/10.18452/26973 eng eng Humboldt-Universität zu Berlin 1437-3254 http://edoc.hu-berlin.de/18452/27661 urn:nbn:de:kobv:11-110-18452/27661-3 doi:10.1007/s00531-020-01820-0 http://dx.doi.org/10.18452/26973 1437-3262 (CC BY 4.0) Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Volcanic tephra Thermal conductivity Major element oxides Iceland Modeling 550 Geowissenschaften ddc:550 article doc-type:article publishedVersion 2020 fthuberlin https://doi.org/10.1007/s00531-020-01820-010.18452/26973 2023-11-05T23:35:42Z Supraglacial deposits of tephra or volcaniclastics have the potential to cause significant anomalies of glacier ablation and runoff. The intensity of these anomalies is governed by the thermal resistivity of the covering layer and hence the thermal conductivity of the deposited grains. This study concentrates on causal and quantitative relationships between density, geochemical composition and thermal conductivity of volcanic materials based on the analysis of 43 samples from locations across Iceland. Thermal conductivity is primarily influenced by density, whereas geochemical composition has been proved to be of subsidiary importance. Four different multiple regression models were calibrated that calculate the grain thermal conductivity of a volcanic material based on rock properties and geochemical composition. In a subsequent step, the bulk thermal conductivity of the respective deposit is calculated as a function of porosity and degree of water saturation. Examples using volcanic material from the Eyjafjallajökull 2010 and Grímsvötn 2011 eruptions confirm that the presented calculation scheme can be executed using only limited geochemical data as input. This facilitates an easy application of the modeling scheme immediately after a volcanic eruption. Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 Peer Reviewed Article in Journal/Newspaper Eyjafjallajökull glacier Iceland Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server |
institution |
Open Polar |
collection |
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server |
op_collection_id |
fthuberlin |
language |
English |
topic |
Volcanic tephra Thermal conductivity Major element oxides Iceland Modeling 550 Geowissenschaften ddc:550 |
spellingShingle |
Volcanic tephra Thermal conductivity Major element oxides Iceland Modeling 550 Geowissenschaften ddc:550 Möller, Rebecca Römer, Wolfgang Möller, Marco Wollenberg, Uwe Lehmkuhl, Frank Schneider, Christoph Kukla, Peter Thermal conductivity of supraglacial volcanic deposits in Iceland |
topic_facet |
Volcanic tephra Thermal conductivity Major element oxides Iceland Modeling 550 Geowissenschaften ddc:550 |
description |
Supraglacial deposits of tephra or volcaniclastics have the potential to cause significant anomalies of glacier ablation and runoff. The intensity of these anomalies is governed by the thermal resistivity of the covering layer and hence the thermal conductivity of the deposited grains. This study concentrates on causal and quantitative relationships between density, geochemical composition and thermal conductivity of volcanic materials based on the analysis of 43 samples from locations across Iceland. Thermal conductivity is primarily influenced by density, whereas geochemical composition has been proved to be of subsidiary importance. Four different multiple regression models were calibrated that calculate the grain thermal conductivity of a volcanic material based on rock properties and geochemical composition. In a subsequent step, the bulk thermal conductivity of the respective deposit is calculated as a function of porosity and degree of water saturation. Examples using volcanic material from the Eyjafjallajökull 2010 and Grímsvötn 2011 eruptions confirm that the presented calculation scheme can be executed using only limited geochemical data as input. This facilitates an easy application of the modeling scheme immediately after a volcanic eruption. Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 Peer Reviewed |
format |
Article in Journal/Newspaper |
author |
Möller, Rebecca Römer, Wolfgang Möller, Marco Wollenberg, Uwe Lehmkuhl, Frank Schneider, Christoph Kukla, Peter |
author_facet |
Möller, Rebecca Römer, Wolfgang Möller, Marco Wollenberg, Uwe Lehmkuhl, Frank Schneider, Christoph Kukla, Peter |
author_sort |
Möller, Rebecca |
title |
Thermal conductivity of supraglacial volcanic deposits in Iceland |
title_short |
Thermal conductivity of supraglacial volcanic deposits in Iceland |
title_full |
Thermal conductivity of supraglacial volcanic deposits in Iceland |
title_fullStr |
Thermal conductivity of supraglacial volcanic deposits in Iceland |
title_full_unstemmed |
Thermal conductivity of supraglacial volcanic deposits in Iceland |
title_sort |
thermal conductivity of supraglacial volcanic deposits in iceland |
publisher |
Humboldt-Universität zu Berlin |
publishDate |
2020 |
url |
http://edoc.hu-berlin.de/18452/27661 https://nbn-resolving.org/urn:nbn:de:kobv:11-110-18452/27661-3 https://doi.org/10.1007/s00531-020-01820-0 https://doi.org/10.18452/26973 |
genre |
Eyjafjallajökull glacier Iceland |
genre_facet |
Eyjafjallajökull glacier Iceland |
op_relation |
1437-3254 http://edoc.hu-berlin.de/18452/27661 urn:nbn:de:kobv:11-110-18452/27661-3 doi:10.1007/s00531-020-01820-0 http://dx.doi.org/10.18452/26973 1437-3262 |
op_rights |
(CC BY 4.0) Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1007/s00531-020-01820-010.18452/26973 |
_version_ |
1784270304610091008 |