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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ftdoajarticles:oai:doaj.org/article:2219559d6884402988fbb91769f4de33 2023-05-15T16:21:38+02:00 Impact of supraglacial deposits of tephra from Grímsvötn volcano, Iceland, on glacier ablation REBECCA MÖLLER MARCO MÖLLER PETER A. KUKLA CHRISTOPH SCHNEIDER 2016-10-01T00:00:00Z https://doi.org/10.1017/jog.2016.82 https://doaj.org/article/2219559d6884402988fbb91769f4de33 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143016000824/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2016.82 0022-1430 1727-5652 https://doaj.org/article/2219559d6884402988fbb91769f4de33 Journal of Glaciology, Vol 62, Pp 933-943 (2016) glacier ablation glacier modelling volcanic tephra volcanoes/ice and snow interactions Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2016 ftdoajarticles https://doi.org/10.1017/jog.2016.82 2023-03-12T01:30:59Z 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. Article in Journal/Newspaper glacier Iceland Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 62 235 933 943 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
glacier ablation glacier modelling volcanic tephra volcanoes/ice and snow interactions Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
glacier ablation glacier modelling volcanic tephra volcanoes/ice and snow interactions Environmental sciences GE1-350 Meteorology. Climatology QC851-999 REBECCA MÖLLER MARCO MÖLLER PETER A. KUKLA CHRISTOPH SCHNEIDER 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 Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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 |
Article in Journal/Newspaper |
author |
REBECCA MÖLLER MARCO MÖLLER PETER A. KUKLA CHRISTOPH SCHNEIDER |
author_facet |
REBECCA MÖLLER MARCO MÖLLER PETER A. KUKLA CHRISTOPH SCHNEIDER |
author_sort |
REBECCA MÖLLER |
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 |
Cambridge University Press |
publishDate |
2016 |
url |
https://doi.org/10.1017/jog.2016.82 https://doaj.org/article/2219559d6884402988fbb91769f4de33 |
genre |
glacier Iceland Journal of Glaciology |
genre_facet |
glacier Iceland Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 62, Pp 933-943 (2016) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143016000824/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2016.82 0022-1430 1727-5652 https://doaj.org/article/2219559d6884402988fbb91769f4de33 |
op_doi |
https://doi.org/10.1017/jog.2016.82 |
container_title |
Journal of Glaciology |
container_volume |
62 |
container_issue |
235 |
container_start_page |
933 |
op_container_end_page |
943 |
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1766009638289932288 |