Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier
There have been rapid increases in both the number and expansion of the proglacial lakes across High Mountain Asia. However, the relationship between proglacial lakes and glacier dynamics remains unclear in the Himalayan region. Here we present the surface elevation, flow-velocity changes, and progl...
Published in: | The Cryosphere |
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Copernicus Publications
2022
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Online Access: | https://doi.org/10.5194/tc-16-2643-2022 https://tc.copernicus.org/articles/16/2643/2022/tc-16-2643-2022.pdf https://doaj.org/article/7759be3a509947d98288ad81b5c46d58 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:7759be3a509947d98288ad81b5c46d58 2023-05-15T18:32:19+02:00 Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier Y. Sato K. Fujita H. Inoue A. Sakai Karma 2022-07-01 https://doi.org/10.5194/tc-16-2643-2022 https://tc.copernicus.org/articles/16/2643/2022/tc-16-2643-2022.pdf https://doaj.org/article/7759be3a509947d98288ad81b5c46d58 en eng Copernicus Publications doi:10.5194/tc-16-2643-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/2643/2022/tc-16-2643-2022.pdf https://doaj.org/article/7759be3a509947d98288ad81b5c46d58 undefined The Cryosphere, Vol 16, Pp 2643-2654 (2022) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/tc-16-2643-2022 2023-01-22T19:13:52Z There have been rapid increases in both the number and expansion of the proglacial lakes across High Mountain Asia. However, the relationship between proglacial lakes and glacier dynamics remains unclear in the Himalayan region. Here we present the surface elevation, flow-velocity changes, and proglacial lake expansion of Thorthormi and Lugge glaciers in the Lunana region, Bhutanese Himalaya, during the 2000–2018 period using photogrammetry and GPS survey data. The lake expansion and surface lowering rates and flow-velocity field of Lugge Glacier, a lake-terminating glacier, have remained approximately constant since 2000. Conversely, there have been accelerated proglacial lake expansion and a 2-fold increase in the thinning rate of Thorthormi Glacier since 2011, as well as a considerable speed-up in the flow-velocity field (>150 m a−1). We reveal that the lake formation and transition of Thorthormi Glacier from a land- to lake-terminating glacier have triggered glacier speed-up and rapid thinning via a positive (compressive) to negative (extensional) change in the emergence velocities. This study provides the first evidence of dynamic glacier changes that are associated with proglacial lake formation across the Himalayan region. Article in Journal/Newspaper The Cryosphere Unknown The Cryosphere 16 6 2643 2654 |
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English |
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geo envir Y. Sato K. Fujita H. Inoue A. Sakai Karma Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier |
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geo envir |
description |
There have been rapid increases in both the number and expansion of the proglacial lakes across High Mountain Asia. However, the relationship between proglacial lakes and glacier dynamics remains unclear in the Himalayan region. Here we present the surface elevation, flow-velocity changes, and proglacial lake expansion of Thorthormi and Lugge glaciers in the Lunana region, Bhutanese Himalaya, during the 2000–2018 period using photogrammetry and GPS survey data. The lake expansion and surface lowering rates and flow-velocity field of Lugge Glacier, a lake-terminating glacier, have remained approximately constant since 2000. Conversely, there have been accelerated proglacial lake expansion and a 2-fold increase in the thinning rate of Thorthormi Glacier since 2011, as well as a considerable speed-up in the flow-velocity field (>150 m a−1). We reveal that the lake formation and transition of Thorthormi Glacier from a land- to lake-terminating glacier have triggered glacier speed-up and rapid thinning via a positive (compressive) to negative (extensional) change in the emergence velocities. This study provides the first evidence of dynamic glacier changes that are associated with proglacial lake formation across the Himalayan region. |
format |
Article in Journal/Newspaper |
author |
Y. Sato K. Fujita H. Inoue A. Sakai Karma |
author_facet |
Y. Sato K. Fujita H. Inoue A. Sakai Karma |
author_sort |
Y. Sato |
title |
Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier |
title_short |
Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier |
title_full |
Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier |
title_fullStr |
Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier |
title_full_unstemmed |
Land- to lake-terminating transition triggers dynamic thinning of a Bhutanese glacier |
title_sort |
land- to lake-terminating transition triggers dynamic thinning of a bhutanese glacier |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/tc-16-2643-2022 https://tc.copernicus.org/articles/16/2643/2022/tc-16-2643-2022.pdf https://doaj.org/article/7759be3a509947d98288ad81b5c46d58 |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, Vol 16, Pp 2643-2654 (2022) |
op_relation |
doi:10.5194/tc-16-2643-2022 1994-0416 1994-0424 https://tc.copernicus.org/articles/16/2643/2022/tc-16-2643-2022.pdf https://doaj.org/article/7759be3a509947d98288ad81b5c46d58 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-16-2643-2022 |
container_title |
The Cryosphere |
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16 |
container_issue |
6 |
container_start_page |
2643 |
op_container_end_page |
2654 |
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