Pluri-decadal (1955–2014) evolution of glacier–rock glacier transitional landforms in the central Andes of Chile (30–33° S)
Three glacier–rock glacier transitional landforms in the central Andes of Chile are investigated over the last decades in order to highlight and question the significance of their landscape and flow dynamics. Historical (1955–2000) aerial photos and contemporary (> 2000) Geoeye satellite images w...
Published in: | Earth Surface Dynamics |
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Language: | English |
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Copernicus Publications
2017
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00009116 2023-05-15T17:58:12+02:00 Pluri-decadal (1955–2014) evolution of glacier–rock glacier transitional landforms in the central Andes of Chile (30–33° S) Monnier, Sébastien Kinnard, Christophe 2017-08 electronic https://doi.org/10.5194/esurf-5-493-2017 https://noa.gwlb.de/receive/cop_mods_00009116 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00009073/esurf-5-493-2017.pdf https://esurf.copernicus.org/articles/5/493/2017/esurf-5-493-2017.pdf eng eng Copernicus Publications Earth Surface Dynamics -- http://www.earth-surf-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2736054 -- 2196-632X https://doi.org/10.5194/esurf-5-493-2017 https://noa.gwlb.de/receive/cop_mods_00009116 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00009073/esurf-5-493-2017.pdf https://esurf.copernicus.org/articles/5/493/2017/esurf-5-493-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/esurf-5-493-2017 2022-02-08T22:57:42Z Three glacier–rock glacier transitional landforms in the central Andes of Chile are investigated over the last decades in order to highlight and question the significance of their landscape and flow dynamics. Historical (1955–2000) aerial photos and contemporary (> 2000) Geoeye satellite images were used together with common processing operations, including imagery orthorectification, digital elevation model generation, and image feature tracking. At each site, the rock glacier morphology area, thermokarst area, elevation changes, and horizontal surface displacements were mapped. The evolution of the landforms over the study period is remarkable, with rapid landscape changes, particularly an expansion of rock glacier morphology areas. Elevation changes were heterogeneous, especially in debris-covered glacier areas with large heaving or lowering up to more than ±1 m yr−1. The use of image feature tracking highlighted spatially coherent flow vector patterns over rock glacier areas and, at two of the three sites, their expansion over the studied period; debris-covered glacier areas are characterized by a lack of movement detection and/or chaotic displacement patterns reflecting thermokarst degradation; mean landform displacement speeds ranged between 0.50 and 1.10 m yr−1 and exhibited a decreasing trend over the studied period. One important highlight of this study is that, especially in persisting cold conditions, rock glaciers can develop upward at the expense of debris-covered glaciers. Two of the studied landforms initially (prior to the study period) developed from an alternation between glacial advances and rock glacier development phases. The other landform is a small debris-covered glacier having evolved into a rock glacier over the last half-century. Based on these results it is proposed that morphological and dynamical interactions between glaciers and permafrost and their resulting hybrid landscapes may enhance the resilience of the mountain cryosphere against climate change. Article in Journal/Newspaper permafrost Thermokarst Niedersächsisches Online-Archiv NOA Earth Surface Dynamics 5 3 493 509 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Monnier, Sébastien Kinnard, Christophe Pluri-decadal (1955–2014) evolution of glacier–rock glacier transitional landforms in the central Andes of Chile (30–33° S) |
topic_facet |
article Verlagsveröffentlichung |
description |
Three glacier–rock glacier transitional landforms in the central Andes of Chile are investigated over the last decades in order to highlight and question the significance of their landscape and flow dynamics. Historical (1955–2000) aerial photos and contemporary (> 2000) Geoeye satellite images were used together with common processing operations, including imagery orthorectification, digital elevation model generation, and image feature tracking. At each site, the rock glacier morphology area, thermokarst area, elevation changes, and horizontal surface displacements were mapped. The evolution of the landforms over the study period is remarkable, with rapid landscape changes, particularly an expansion of rock glacier morphology areas. Elevation changes were heterogeneous, especially in debris-covered glacier areas with large heaving or lowering up to more than ±1 m yr−1. The use of image feature tracking highlighted spatially coherent flow vector patterns over rock glacier areas and, at two of the three sites, their expansion over the studied period; debris-covered glacier areas are characterized by a lack of movement detection and/or chaotic displacement patterns reflecting thermokarst degradation; mean landform displacement speeds ranged between 0.50 and 1.10 m yr−1 and exhibited a decreasing trend over the studied period. One important highlight of this study is that, especially in persisting cold conditions, rock glaciers can develop upward at the expense of debris-covered glaciers. Two of the studied landforms initially (prior to the study period) developed from an alternation between glacial advances and rock glacier development phases. The other landform is a small debris-covered glacier having evolved into a rock glacier over the last half-century. Based on these results it is proposed that morphological and dynamical interactions between glaciers and permafrost and their resulting hybrid landscapes may enhance the resilience of the mountain cryosphere against climate change. |
format |
Article in Journal/Newspaper |
author |
Monnier, Sébastien Kinnard, Christophe |
author_facet |
Monnier, Sébastien Kinnard, Christophe |
author_sort |
Monnier, Sébastien |
title |
Pluri-decadal (1955–2014) evolution of glacier–rock glacier transitional landforms in the central Andes of Chile (30–33° S) |
title_short |
Pluri-decadal (1955–2014) evolution of glacier–rock glacier transitional landforms in the central Andes of Chile (30–33° S) |
title_full |
Pluri-decadal (1955–2014) evolution of glacier–rock glacier transitional landforms in the central Andes of Chile (30–33° S) |
title_fullStr |
Pluri-decadal (1955–2014) evolution of glacier–rock glacier transitional landforms in the central Andes of Chile (30–33° S) |
title_full_unstemmed |
Pluri-decadal (1955–2014) evolution of glacier–rock glacier transitional landforms in the central Andes of Chile (30–33° S) |
title_sort |
pluri-decadal (1955–2014) evolution of glacier–rock glacier transitional landforms in the central andes of chile (30–33° s) |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/esurf-5-493-2017 https://noa.gwlb.de/receive/cop_mods_00009116 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00009073/esurf-5-493-2017.pdf https://esurf.copernicus.org/articles/5/493/2017/esurf-5-493-2017.pdf |
genre |
permafrost Thermokarst |
genre_facet |
permafrost Thermokarst |
op_relation |
Earth Surface Dynamics -- http://www.earth-surf-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2736054 -- 2196-632X https://doi.org/10.5194/esurf-5-493-2017 https://noa.gwlb.de/receive/cop_mods_00009116 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00009073/esurf-5-493-2017.pdf https://esurf.copernicus.org/articles/5/493/2017/esurf-5-493-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/esurf-5-493-2017 |
container_title |
Earth Surface Dynamics |
container_volume |
5 |
container_issue |
3 |
container_start_page |
493 |
op_container_end_page |
509 |
_version_ |
1766166749768581120 |