Basal freeze-on generates complex ice-sheet stratigraphy

Large, plume-like internal ice-layer-structures have been observed in radar images from both Antarctica and Greenland, rising from the ice-sheet base to up to half of the ice thickness. Their origins are not yet understood. Here, we simulate their genesis by basal freeze-on using numerical ice-flow...

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Published in:Nature Communications
Main Authors: Leysinger Vieli, G. J.-M. C., Martín, C., Hindmarsh, R. C. A., Lüthi, M. P.
Format: Text
Language:English
Published: Nature Publishing Group UK 2018
Subjects:
Article
Greenland
Antarc*
Antarctica
ice core
Ice Sheet
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6220257/
https://doi.org/10.1038/s41467-018-07083-3
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spelling ftpubmed:oai:pubmedcentral.nih.gov:6220257 2023-05-15T13:33:55+02:00 Basal freeze-on generates complex ice-sheet stratigraphy Leysinger Vieli, G. J.-M. C. Martín, C. Hindmarsh, R. C. A. Lüthi, M. P. 2018-11-07 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6220257/ https://doi.org/10.1038/s41467-018-07083-3 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6220257/ http://dx.doi.org/10.1038/s41467-018-07083-3 © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2018 ftpubmed https://doi.org/10.1038/s41467-018-07083-3 2018-11-11T01:30:01Z Large, plume-like internal ice-layer-structures have been observed in radar images from both Antarctica and Greenland, rising from the ice-sheet base to up to half of the ice thickness. Their origins are not yet understood. Here, we simulate their genesis by basal freeze-on using numerical ice-flow modelling and analyse the transient evolution of the emerging ice-plume and the surrounding ice-layer structure as a function of both freeze-on rate and ice flux. We find good agreement between radar observations, modelled ice-plume geometry and internal layer structure, and further show that plume height relates primarily to ice-flux and only secondarily to freeze-on. An in-depth analysis, performed for Northern Greenland of observed spatial plume distribution related to ice flow, basal topography and water availability supports our findings regarding ice flux and suggests freeze-on is controlled by ascending subglacial water flow. Our results imply that widespread basal freeze-on strongly affects ice stratigraphy and consequently ice-core interpretations. Text Antarc* Antarctica Greenland ice core Ice Sheet PubMed Central (PMC) Greenland Nature Communications 9 1
institution Open Polar
collection PubMed Central (PMC)
op_collection_id ftpubmed
language English
topic Article
spellingShingle Article
Leysinger Vieli, G. J.-M. C.
Martín, C.
Hindmarsh, R. C. A.
Lüthi, M. P.
Basal freeze-on generates complex ice-sheet stratigraphy
topic_facet Article
description Large, plume-like internal ice-layer-structures have been observed in radar images from both Antarctica and Greenland, rising from the ice-sheet base to up to half of the ice thickness. Their origins are not yet understood. Here, we simulate their genesis by basal freeze-on using numerical ice-flow modelling and analyse the transient evolution of the emerging ice-plume and the surrounding ice-layer structure as a function of both freeze-on rate and ice flux. We find good agreement between radar observations, modelled ice-plume geometry and internal layer structure, and further show that plume height relates primarily to ice-flux and only secondarily to freeze-on. An in-depth analysis, performed for Northern Greenland of observed spatial plume distribution related to ice flow, basal topography and water availability supports our findings regarding ice flux and suggests freeze-on is controlled by ascending subglacial water flow. Our results imply that widespread basal freeze-on strongly affects ice stratigraphy and consequently ice-core interpretations.
format Text
author Leysinger Vieli, G. J.-M. C.
Martín, C.
Hindmarsh, R. C. A.
Lüthi, M. P.
author_facet Leysinger Vieli, G. J.-M. C.
Martín, C.
Hindmarsh, R. C. A.
Lüthi, M. P.
author_sort Leysinger Vieli, G. J.-M. C.
title Basal freeze-on generates complex ice-sheet stratigraphy
title_short Basal freeze-on generates complex ice-sheet stratigraphy
title_full Basal freeze-on generates complex ice-sheet stratigraphy
title_fullStr Basal freeze-on generates complex ice-sheet stratigraphy
title_full_unstemmed Basal freeze-on generates complex ice-sheet stratigraphy
title_sort basal freeze-on generates complex ice-sheet stratigraphy
publisher Nature Publishing Group UK
publishDate 2018
url http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6220257/
https://doi.org/10.1038/s41467-018-07083-3
geographic Greenland
geographic_facet Greenland
genre Antarc*
Antarctica
Greenland
ice core
Ice Sheet
genre_facet Antarc*
Antarctica
Greenland
ice core
Ice Sheet
op_relation http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6220257/
http://dx.doi.org/10.1038/s41467-018-07083-3
op_rights © The Author(s) 2018
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
op_rightsnorm CC-BY
op_doi https://doi.org/10.1038/s41467-018-07083-3
container_title Nature Communications
container_volume 9
container_issue 1
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