Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska.
© The Author(s), 2020. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial re-use, distribution, and...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/11343 2023-05-15T16:20:26+02:00 Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska. Amundson, Jason M. Kienholz, Christian Hager, Alexander O. Jackson, Rebecca H. Motyka, Roman J. Nash, Jonathan D. Sutherland, David A. 2020-05-14 http://hdl.handle.net/11122/11343 en eng Cambridge University Press Amundson JM, Kienholz C, Hager AO, Jackson RH, Motyka RJ, Nash JD, Sutherland DA (2020). Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska. Journal of Glaciology 66(258), 577–590. https://doi.org/10.1017/jog.2020.29 1727-5652 http://hdl.handle.net/11122/11343 Journal of Glaciology Journal of Glaciology Calving ice/ocean interactions icebergs Article 2020 ftunivalaska https://doi.org/10.1017/jog.2020.29 2023-02-23T21:37:40Z © The Author(s), 2020. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is included and the original work is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use. Supplementary material. The supplementary material for this article can be found at https://doi.org/10.1017/jog.2020.29 Ice mélange has been postulated to impact glacier and fjord dynamics through a variety of mechanical and thermodynamic couplings. However, observations of these interactions are very limited. Here, we report on glaciological and oceanographic data that were collected from 2016 to 2017 at LeConte Glacier and Bay, Alaska, and serendipitously captured the formation, flow and break-up of ephemeral ice mélange. Sea ice formed overnight in mid-February. Over the subsequent week, the sea ice and icebergs were compacted by the advancing glacier terminus, after which the ice mélange flowed quasi-statically. The presence of ice mélange coincided with the lowest glacier velocities and frontal ablation rates in our record. In early April, increasing glacier runoff and the formation of a sub-ice-mélange plume began to melt and pull apart the ice mélange. The plume, outgoing tides and large calving events contributed to its break-up, which took place over a week and occurred in pulses. Unlike observations from elsewhere, the loss of ice mélange integrity did not coincide with the onset of seasonal glacier retreat. Our observations provide a challenge to ice mélange models aimed at quantifying the mechanical and thermodynamic couplings between ice mélange, glaciers and fjords. This work was supported by the US NSF awards OPP-1503910, OPP-1504191, OPP-1504288, OPP-1504521 and DMR-1506307. The ... Article in Journal/Newspaper glacier glaciers Journal of Glaciology Sea ice Alaska University of Alaska: ScholarWorks@UA Journal of Glaciology 66 258 577 590 |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
topic |
Calving ice/ocean interactions icebergs |
spellingShingle |
Calving ice/ocean interactions icebergs Amundson, Jason M. Kienholz, Christian Hager, Alexander O. Jackson, Rebecca H. Motyka, Roman J. Nash, Jonathan D. Sutherland, David A. Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska. |
topic_facet |
Calving ice/ocean interactions icebergs |
description |
© The Author(s), 2020. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is included and the original work is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use. Supplementary material. The supplementary material for this article can be found at https://doi.org/10.1017/jog.2020.29 Ice mélange has been postulated to impact glacier and fjord dynamics through a variety of mechanical and thermodynamic couplings. However, observations of these interactions are very limited. Here, we report on glaciological and oceanographic data that were collected from 2016 to 2017 at LeConte Glacier and Bay, Alaska, and serendipitously captured the formation, flow and break-up of ephemeral ice mélange. Sea ice formed overnight in mid-February. Over the subsequent week, the sea ice and icebergs were compacted by the advancing glacier terminus, after which the ice mélange flowed quasi-statically. The presence of ice mélange coincided with the lowest glacier velocities and frontal ablation rates in our record. In early April, increasing glacier runoff and the formation of a sub-ice-mélange plume began to melt and pull apart the ice mélange. The plume, outgoing tides and large calving events contributed to its break-up, which took place over a week and occurred in pulses. Unlike observations from elsewhere, the loss of ice mélange integrity did not coincide with the onset of seasonal glacier retreat. Our observations provide a challenge to ice mélange models aimed at quantifying the mechanical and thermodynamic couplings between ice mélange, glaciers and fjords. This work was supported by the US NSF awards OPP-1503910, OPP-1504191, OPP-1504288, OPP-1504521 and DMR-1506307. The ... |
format |
Article in Journal/Newspaper |
author |
Amundson, Jason M. Kienholz, Christian Hager, Alexander O. Jackson, Rebecca H. Motyka, Roman J. Nash, Jonathan D. Sutherland, David A. |
author_facet |
Amundson, Jason M. Kienholz, Christian Hager, Alexander O. Jackson, Rebecca H. Motyka, Roman J. Nash, Jonathan D. Sutherland, David A. |
author_sort |
Amundson, Jason M. |
title |
Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska. |
title_short |
Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska. |
title_full |
Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska. |
title_fullStr |
Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska. |
title_full_unstemmed |
Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska. |
title_sort |
formation, flow and break-up of ephemeral ice mélange at leconte glacier and bay, alaska. |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
http://hdl.handle.net/11122/11343 |
genre |
glacier glaciers Journal of Glaciology Sea ice Alaska |
genre_facet |
glacier glaciers Journal of Glaciology Sea ice Alaska |
op_source |
Journal of Glaciology |
op_relation |
Amundson JM, Kienholz C, Hager AO, Jackson RH, Motyka RJ, Nash JD, Sutherland DA (2020). Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska. Journal of Glaciology 66(258), 577–590. https://doi.org/10.1017/jog.2020.29 1727-5652 http://hdl.handle.net/11122/11343 Journal of Glaciology |
op_doi |
https://doi.org/10.1017/jog.2020.29 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
258 |
container_start_page |
577 |
op_container_end_page |
590 |
_version_ |
1766008349225123840 |