New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure
The ice-cored Galena Creek Rock Glacier, Wyoming, USA, has been the subject of a number of studies that sought to determine the origin of its ice. We present new observations of the rock glacier's internal structure from ground-penetrating radar to constrain ice and debris distribution and accu...
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Online Access: | http://hdl.handle.net/10150/637075 https://doi.org/10.1017/jog.2019.67 |
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ftunivarizona:oai:repository.arizona.edu:10150/637075 2023-05-15T16:57:10+02:00 New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure Petersen, Eric Ivan Levy, Joseph S. Holt, John W. Stuurman, Cassie M. Univ Arizona, Lunar & Planetary Lab 2019-10-04 http://hdl.handle.net/10150/637075 https://doi.org/10.1017/jog.2019.67 en eng CAMBRIDGE UNIV PRESS Petersen EI, Levy JS, Holt JW, Stuurman CM (2020). New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure. Journal of Glaciology 66(255), 1–10. https:// doi.org/10.1017/jog.2019.67 0022-1430 doi:10.1017/jog.2019.67 http://hdl.handle.net/10150/637075 JOURNAL OF GLACIOLOGY S0022143019000674 Copyright © The Author(s) 2019. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/licenses/by/4.0/ CC-BY Journal of Glaciology 66 255 1 10 Accumulation debris-covered glaciers glacier geophysics supraglacial debris Article 2019 ftunivarizona https://doi.org/10.1017/jog.2019.67 2020-06-14T08:18:15Z The ice-cored Galena Creek Rock Glacier, Wyoming, USA, has been the subject of a number of studies that sought to determine the origin of its ice. We present new observations of the rock glacier's internal structure from ground-penetrating radar to constrain ice and debris distribution and accumulation. We imaged dipping reflectors in the center of the glacier that are weak and discontinuous, in contrast to strong reflectors toward the edge of the cirque beneath large debris-avalanche chutes. These reflectors form a network of concave-up, up-glacier dipping layers. We interpret these as englacial debris bands formed by large debris falls buried by subsequent ice and snow accumulation. They are discontinuous where ice outpaces debris accumulation, but with sufficient debris accumulation an interleaved pattern of ice and debris layers can form. We propose a model in which the ice in these interleaved layers is snowfall preserved by debris-facilitated accumulation. Large debris falls that occur in early spring bury sections of the snowpack, which are then preserved through summer and incorporated into the rock glacier body over time. This study highlights the importance of sequential accumulation of ice and debris for understanding the dynamics of rock glaciers and debris-covered glaciers. Open access journal This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. Article in Journal/Newspaper Journal of Glaciology The University of Arizona: UA Campus Repository Journal of Glaciology 66 255 1 10 |
institution |
Open Polar |
collection |
The University of Arizona: UA Campus Repository |
op_collection_id |
ftunivarizona |
language |
English |
topic |
Accumulation debris-covered glaciers glacier geophysics supraglacial debris |
spellingShingle |
Accumulation debris-covered glaciers glacier geophysics supraglacial debris Petersen, Eric Ivan Levy, Joseph S. Holt, John W. Stuurman, Cassie M. New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure |
topic_facet |
Accumulation debris-covered glaciers glacier geophysics supraglacial debris |
description |
The ice-cored Galena Creek Rock Glacier, Wyoming, USA, has been the subject of a number of studies that sought to determine the origin of its ice. We present new observations of the rock glacier's internal structure from ground-penetrating radar to constrain ice and debris distribution and accumulation. We imaged dipping reflectors in the center of the glacier that are weak and discontinuous, in contrast to strong reflectors toward the edge of the cirque beneath large debris-avalanche chutes. These reflectors form a network of concave-up, up-glacier dipping layers. We interpret these as englacial debris bands formed by large debris falls buried by subsequent ice and snow accumulation. They are discontinuous where ice outpaces debris accumulation, but with sufficient debris accumulation an interleaved pattern of ice and debris layers can form. We propose a model in which the ice in these interleaved layers is snowfall preserved by debris-facilitated accumulation. Large debris falls that occur in early spring bury sections of the snowpack, which are then preserved through summer and incorporated into the rock glacier body over time. This study highlights the importance of sequential accumulation of ice and debris for understanding the dynamics of rock glaciers and debris-covered glaciers. Open access journal This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. |
author2 |
Univ Arizona, Lunar & Planetary Lab |
format |
Article in Journal/Newspaper |
author |
Petersen, Eric Ivan Levy, Joseph S. Holt, John W. Stuurman, Cassie M. |
author_facet |
Petersen, Eric Ivan Levy, Joseph S. Holt, John W. Stuurman, Cassie M. |
author_sort |
Petersen, Eric Ivan |
title |
New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure |
title_short |
New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure |
title_full |
New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure |
title_fullStr |
New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure |
title_full_unstemmed |
New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure |
title_sort |
new insights into ice accumulation at galena creek rock glacier from radar imaging of its internal structure |
publisher |
CAMBRIDGE UNIV PRESS |
publishDate |
2019 |
url |
http://hdl.handle.net/10150/637075 https://doi.org/10.1017/jog.2019.67 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology 66 255 1 10 |
op_relation |
Petersen EI, Levy JS, Holt JW, Stuurman CM (2020). New insights into ice accumulation at Galena Creek Rock Glacier from radar imaging of its internal structure. Journal of Glaciology 66(255), 1–10. https:// doi.org/10.1017/jog.2019.67 0022-1430 doi:10.1017/jog.2019.67 http://hdl.handle.net/10150/637075 JOURNAL OF GLACIOLOGY S0022143019000674 |
op_rights |
Copyright © The Author(s) 2019. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/jog.2019.67 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
255 |
container_start_page |
1 |
op_container_end_page |
10 |
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1766048451840180224 |