Status and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.)
International audience In the context of a general retreat of glaciers in the dry Andes, this study focuses on the state and recent evolution of debris-covered glaciers and permafrost-related landforms, especially rock glaciers, in the semiarid to semihumid Laguna Negra catchment, a part of the Ande...
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ftccsdartic:oai:HAL:halsde-00574550v1 2023-07-23T04:21:20+02:00 Status and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.) Bodin, Xavier Rojas, F. Brenning, A. Instituto de Geografia Pontificia Universidad Católica de Chile (UC) Department of Geography and Environmental Management Waterloo University of Waterloo Waterloo 2010 https://hal.science/halsde-00574550 en eng HAL CCSD Elsevier halsde-00574550 https://hal.science/halsde-00574550 ISSN: 0169-555X Geomorphology https://hal.science/halsde-00574550 Geomorphology, 2010, 118, pp.453-464 Rock glacier Debris-covered glacier Thermokarst Downwasting Mountain permafrost Ground temperature monitoring [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2010 ftccsdartic 2023-07-01T22:40:42Z International audience In the context of a general retreat of glaciers in the dry Andes, this study focuses on the state and recent evolution of debris-covered glaciers and permafrost-related landforms, especially rock glaciers, in the semiarid to semihumid Laguna Negra catchment, a part of the Andes of central Chile at 33.5°S, that is a key contributor of drinking water for the city of Santiago. We conducted catchment-scale geomorphological mapping, diachronic analysis of 1955 and 1996 orthophotographs and digital elevation models (DEMs), and the analysis of ground temperatures and their sensitivity to climate variation. Rock glaciers dominate spatially and in terms of water storage over glaciers (area ratio: 1.7:1; ratio of water equivalents: 1.5:1). An intense downwasting has affected both debris-covered and exposed glacier components in the Punta Negra subcatchment, a process that is associated with the growth of numerous thermokarst depressions. The altitudinal transect of ground temperature suggest that permafrost is widespread above ∼4000 m asl, although it can also occur at lower elevations on sheltered footslopes and within rock glaciers. The sensitivity analysis indicates that the near-surface ground thermal regime at high altitudes is strongly influenced by the snow cover disappearance date, which may therefore constitute an important control on the effect of climatic warming. Article in Journal/Newspaper permafrost Thermokarst Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Rock glacier Debris-covered glacier Thermokarst Downwasting Mountain permafrost Ground temperature monitoring [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
Rock glacier Debris-covered glacier Thermokarst Downwasting Mountain permafrost Ground temperature monitoring [SDE.MCG]Environmental Sciences/Global Changes Bodin, Xavier Rojas, F. Brenning, A. Status and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.) |
topic_facet |
Rock glacier Debris-covered glacier Thermokarst Downwasting Mountain permafrost Ground temperature monitoring [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience In the context of a general retreat of glaciers in the dry Andes, this study focuses on the state and recent evolution of debris-covered glaciers and permafrost-related landforms, especially rock glaciers, in the semiarid to semihumid Laguna Negra catchment, a part of the Andes of central Chile at 33.5°S, that is a key contributor of drinking water for the city of Santiago. We conducted catchment-scale geomorphological mapping, diachronic analysis of 1955 and 1996 orthophotographs and digital elevation models (DEMs), and the analysis of ground temperatures and their sensitivity to climate variation. Rock glaciers dominate spatially and in terms of water storage over glaciers (area ratio: 1.7:1; ratio of water equivalents: 1.5:1). An intense downwasting has affected both debris-covered and exposed glacier components in the Punta Negra subcatchment, a process that is associated with the growth of numerous thermokarst depressions. The altitudinal transect of ground temperature suggest that permafrost is widespread above ∼4000 m asl, although it can also occur at lower elevations on sheltered footslopes and within rock glaciers. The sensitivity analysis indicates that the near-surface ground thermal regime at high altitudes is strongly influenced by the snow cover disappearance date, which may therefore constitute an important control on the effect of climatic warming. |
author2 |
Instituto de Geografia Pontificia Universidad Católica de Chile (UC) Department of Geography and Environmental Management Waterloo University of Waterloo Waterloo |
format |
Article in Journal/Newspaper |
author |
Bodin, Xavier Rojas, F. Brenning, A. |
author_facet |
Bodin, Xavier Rojas, F. Brenning, A. |
author_sort |
Bodin, Xavier |
title |
Status and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.) |
title_short |
Status and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.) |
title_full |
Status and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.) |
title_fullStr |
Status and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.) |
title_full_unstemmed |
Status and evolution of the cryosphere in the Andes of Santiago (Chile, 33.5°S.) |
title_sort |
status and evolution of the cryosphere in the andes of santiago (chile, 33.5°s.) |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.science/halsde-00574550 |
genre |
permafrost Thermokarst |
genre_facet |
permafrost Thermokarst |
op_source |
ISSN: 0169-555X Geomorphology https://hal.science/halsde-00574550 Geomorphology, 2010, 118, pp.453-464 |
op_relation |
halsde-00574550 https://hal.science/halsde-00574550 |
_version_ |
1772186790766051328 |