Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile
Glaciers and rock glaciers play an important role in the hydrology of the semi-arid northern Chile. Several studies show that glaciers have rapidly lost mass in response to climate change during the last decades. The response of rock glaciers to climate change in this region is, however, less known....
Published in: | The Cryosphere |
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Language: | English |
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2022
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Online Access: | https://research-portal.st-andrews.ac.uk/en/researchoutput/glacier-and-rock-glacier-changes-since-the-1950s-in-the-la-laguna-catchment-chile(d1461d5e-5880-4636-8bfe-052d9a1bb852).html https://doi.org/10.5194/tc-16-647-2022 https://research-repository.st-andrews.ac.uk/bitstream/10023/25024/1/Robson_2022_TC_Glacier_rock_glacier_changes_CC.pdf |
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ftunstandrewcris:oai:research-portal.st-andrews.ac.uk:publications/d1461d5e-5880-4636-8bfe-052d9a1bb852 2024-06-23T07:53:40+00:00 Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile Robson, Benjamin Aubrey MacDonell, Shelley Ayala, Álvaro Bolch, Tobias Nielsen, Pål Ringkjøb Vivero, Sebastián 2022-02-21 application/pdf https://research-portal.st-andrews.ac.uk/en/researchoutput/glacier-and-rock-glacier-changes-since-the-1950s-in-the-la-laguna-catchment-chile(d1461d5e-5880-4636-8bfe-052d9a1bb852).html https://doi.org/10.5194/tc-16-647-2022 https://research-repository.st-andrews.ac.uk/bitstream/10023/25024/1/Robson_2022_TC_Glacier_rock_glacier_changes_CC.pdf eng eng https://research-portal.st-andrews.ac.uk/en/researchoutput/glacier-and-rock-glacier-changes-since-the-1950s-in-the-la-laguna-catchment-chile(d1461d5e-5880-4636-8bfe-052d9a1bb852).html info:eu-repo/semantics/openAccess Robson , B A , MacDonell , S , Ayala , Á , Bolch , T , Nielsen , P R & Vivero , S 2022 , ' Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile ' , Cryosphere , vol. 16 , no. 2 , pp. 647-665 . https://doi.org/10.5194/tc-16-647-2022 article 2022 ftunstandrewcris https://doi.org/10.5194/tc-16-647-2022 2024-06-13T01:20:25Z Glaciers and rock glaciers play an important role in the hydrology of the semi-arid northern Chile. Several studies show that glaciers have rapidly lost mass in response to climate change during the last decades. The response of rock glaciers to climate change in this region is, however, less known. In this study we use a combination of historical aerial photography, stereo satellite imagery, airborne lidar, and the Shuttle Radar Topography Mission (SRTM) DEM to report glacier changes for the Tapado Glacier-rock glacier complex from the 1950s to 2020 and to report mass balances for the glacier component of the complex, Tapado Glacier. Furthermore, we examine high-resolution elevation changes and surface velocities between 2012 and 2020 for 35 rock glaciers in the La Laguna catchment. Our results show how Tapado Glacier has shrunk by -25.2 +/- 4.6 % between 1956 and 2020, while the mass balance of Tapado Glacier has become steadily more negative, from being approximately in balance between 1956 and 1978 (-0.04 +/- 0.08 m w.e. a(-1)) to showing increased losses between 2015 and 2020 (-0.32 +/- 0.08 m w.e. a(-1)). Climatological (re-)analyses reveal a general increase in air temperature, decrease in humidity, and variable precipitation since the 1980s in the region. In particular, the severe droughts starting in 2010 resulted in a negative mass balance of -0.54 +/- 0.10 m w.e. a(-1) between 2012 and 2015. The rock glaciers within the La Laguna catchment show heterogenous changes, with some sections of landforms exhibiting pronounced elevation changes and surface velocities exceeding that of Tapado Glacier. This could be indicative of high ice contents within the landforms and also highlights the importance of considering how landforms can transition from more glacial landforms to more periglacial features under permafrost conditions. As such, we believe high-resolution (sub-metre) elevation changes and surface velocities are a useful first step for identifying ice-rich landforms. Article in Journal/Newspaper Ice permafrost University of St Andrews: Research Portal The Cryosphere 16 2 647 665 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
description |
Glaciers and rock glaciers play an important role in the hydrology of the semi-arid northern Chile. Several studies show that glaciers have rapidly lost mass in response to climate change during the last decades. The response of rock glaciers to climate change in this region is, however, less known. In this study we use a combination of historical aerial photography, stereo satellite imagery, airborne lidar, and the Shuttle Radar Topography Mission (SRTM) DEM to report glacier changes for the Tapado Glacier-rock glacier complex from the 1950s to 2020 and to report mass balances for the glacier component of the complex, Tapado Glacier. Furthermore, we examine high-resolution elevation changes and surface velocities between 2012 and 2020 for 35 rock glaciers in the La Laguna catchment. Our results show how Tapado Glacier has shrunk by -25.2 +/- 4.6 % between 1956 and 2020, while the mass balance of Tapado Glacier has become steadily more negative, from being approximately in balance between 1956 and 1978 (-0.04 +/- 0.08 m w.e. a(-1)) to showing increased losses between 2015 and 2020 (-0.32 +/- 0.08 m w.e. a(-1)). Climatological (re-)analyses reveal a general increase in air temperature, decrease in humidity, and variable precipitation since the 1980s in the region. In particular, the severe droughts starting in 2010 resulted in a negative mass balance of -0.54 +/- 0.10 m w.e. a(-1) between 2012 and 2015. The rock glaciers within the La Laguna catchment show heterogenous changes, with some sections of landforms exhibiting pronounced elevation changes and surface velocities exceeding that of Tapado Glacier. This could be indicative of high ice contents within the landforms and also highlights the importance of considering how landforms can transition from more glacial landforms to more periglacial features under permafrost conditions. As such, we believe high-resolution (sub-metre) elevation changes and surface velocities are a useful first step for identifying ice-rich landforms. |
format |
Article in Journal/Newspaper |
author |
Robson, Benjamin Aubrey MacDonell, Shelley Ayala, Álvaro Bolch, Tobias Nielsen, Pål Ringkjøb Vivero, Sebastián |
spellingShingle |
Robson, Benjamin Aubrey MacDonell, Shelley Ayala, Álvaro Bolch, Tobias Nielsen, Pål Ringkjøb Vivero, Sebastián Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile |
author_facet |
Robson, Benjamin Aubrey MacDonell, Shelley Ayala, Álvaro Bolch, Tobias Nielsen, Pål Ringkjøb Vivero, Sebastián |
author_sort |
Robson, Benjamin Aubrey |
title |
Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile |
title_short |
Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile |
title_full |
Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile |
title_fullStr |
Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile |
title_full_unstemmed |
Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile |
title_sort |
glacier and rock glacier changes since the 1950s in the la laguna catchment, chile |
publishDate |
2022 |
url |
https://research-portal.st-andrews.ac.uk/en/researchoutput/glacier-and-rock-glacier-changes-since-the-1950s-in-the-la-laguna-catchment-chile(d1461d5e-5880-4636-8bfe-052d9a1bb852).html https://doi.org/10.5194/tc-16-647-2022 https://research-repository.st-andrews.ac.uk/bitstream/10023/25024/1/Robson_2022_TC_Glacier_rock_glacier_changes_CC.pdf |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Robson , B A , MacDonell , S , Ayala , Á , Bolch , T , Nielsen , P R & Vivero , S 2022 , ' Glacier and rock glacier changes since the 1950s in the La Laguna catchment, Chile ' , Cryosphere , vol. 16 , no. 2 , pp. 647-665 . https://doi.org/10.5194/tc-16-647-2022 |
op_relation |
https://research-portal.st-andrews.ac.uk/en/researchoutput/glacier-and-rock-glacier-changes-since-the-1950s-in-the-la-laguna-catchment-chile(d1461d5e-5880-4636-8bfe-052d9a1bb852).html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-16-647-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
2 |
container_start_page |
647 |
op_container_end_page |
665 |
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1802645426701074432 |