Impact of supraglacial deposits of tephra from Grímsvötn volcano, Iceland, on glacier ablation
Supraglacial deposits are known for their influence on glacier ablation. The magnitude of this influence depends on the thickness and the type of the deposited material. The effects of thin layers of atmospheric black carbon and of thick moraine debris have been intensively studied. Studies related...
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ftdatacite:10.18452/18159 2023-05-15T16:21:38+02:00 Impact of supraglacial deposits of tephra from Grímsvötn volcano, Iceland, on glacier ablation Möller, Marco Möller, Rebecca Kukla, Peter Schneider, Christoph 2016 https://dx.doi.org/10.18452/18159 https://edoc.hu-berlin.de/handle/18452/18830 en eng Humboldt-Universität zu Berlin Attribution-NonCommercial-ShareAlike 4.0 International http://creativecommons.org/licenses/by-nc-sa/4.0 CC-BY-NC-SA glacier ablation glacier modelling volcanic tephra volcanoes/ice and snow interactions 914 Geografie Europas und Reisen in Europa Text article article-journal ScholarlyArticle 2016 ftdatacite https://doi.org/10.18452/18159 2021-11-05T12:55:41Z Supraglacial deposits are known for their influence on glacier ablation. The magnitude of this influence depends on the thickness and the type of the deposited material. The effects of thin layers of atmospheric black carbon and of thick moraine debris have been intensively studied. Studies related to regional-scale deposits of volcanic tephra with thicknesses varying between millimetres and metres and thus over several orders of magnitude are scarce. We present results of a field experiment in which we investigated the influence of supraglacial deposits of tephra from Grímsvötn volcano on bare-ice ablation at Svínafelsjökull, Iceland. We observed that the effective thickness at which ablation is maximized ranges from 1.0 to 2.0 mm. At ∼10 mm a critical thickness is reached where sub-tephra ablation equals bare-ice ablation. We calibrated two empirical ablation models and a semi-physics-based ablation model that all account for varying tephra-layer thicknesses. A comparison of the three models indicates that for tephra deposits in the lower-millimetre scale the temperature/radiation-index model performs best, but that a semi-physics-based approach could be expected to yield superior results for tephra deposits of the order of decimetres. Text glacier Iceland DataCite Metadata Store (German National Library of Science and Technology) |
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English |
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glacier ablation glacier modelling volcanic tephra volcanoes/ice and snow interactions 914 Geografie Europas und Reisen in Europa |
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glacier ablation glacier modelling volcanic tephra volcanoes/ice and snow interactions 914 Geografie Europas und Reisen in Europa Möller, Marco Möller, Rebecca Kukla, Peter Schneider, Christoph Impact of supraglacial deposits of tephra from Grímsvötn volcano, Iceland, on glacier ablation |
topic_facet |
glacier ablation glacier modelling volcanic tephra volcanoes/ice and snow interactions 914 Geografie Europas und Reisen in Europa |
description |
Supraglacial deposits are known for their influence on glacier ablation. The magnitude of this influence depends on the thickness and the type of the deposited material. The effects of thin layers of atmospheric black carbon and of thick moraine debris have been intensively studied. Studies related to regional-scale deposits of volcanic tephra with thicknesses varying between millimetres and metres and thus over several orders of magnitude are scarce. We present results of a field experiment in which we investigated the influence of supraglacial deposits of tephra from Grímsvötn volcano on bare-ice ablation at Svínafelsjökull, Iceland. We observed that the effective thickness at which ablation is maximized ranges from 1.0 to 2.0 mm. At ∼10 mm a critical thickness is reached where sub-tephra ablation equals bare-ice ablation. We calibrated two empirical ablation models and a semi-physics-based ablation model that all account for varying tephra-layer thicknesses. A comparison of the three models indicates that for tephra deposits in the lower-millimetre scale the temperature/radiation-index model performs best, but that a semi-physics-based approach could be expected to yield superior results for tephra deposits of the order of decimetres. |
format |
Text |
author |
Möller, Marco Möller, Rebecca Kukla, Peter Schneider, Christoph |
author_facet |
Möller, Marco Möller, Rebecca Kukla, Peter Schneider, Christoph |
author_sort |
Möller, Marco |
title |
Impact of supraglacial deposits of tephra from Grímsvötn volcano, Iceland, on glacier ablation |
title_short |
Impact of supraglacial deposits of tephra from Grímsvötn volcano, Iceland, on glacier ablation |
title_full |
Impact of supraglacial deposits of tephra from Grímsvötn volcano, Iceland, on glacier ablation |
title_fullStr |
Impact of supraglacial deposits of tephra from Grímsvötn volcano, Iceland, on glacier ablation |
title_full_unstemmed |
Impact of supraglacial deposits of tephra from Grímsvötn volcano, Iceland, on glacier ablation |
title_sort |
impact of supraglacial deposits of tephra from grímsvötn volcano, iceland, on glacier ablation |
publisher |
Humboldt-Universität zu Berlin |
publishDate |
2016 |
url |
https://dx.doi.org/10.18452/18159 https://edoc.hu-berlin.de/handle/18452/18830 |
genre |
glacier Iceland |
genre_facet |
glacier Iceland |
op_rights |
Attribution-NonCommercial-ShareAlike 4.0 International http://creativecommons.org/licenses/by-nc-sa/4.0 |
op_rightsnorm |
CC-BY-NC-SA |
op_doi |
https://doi.org/10.18452/18159 |
_version_ |
1766009637546491904 |