Permafrost distribution modelling in the semi-arid Chilean Andes
International audience Mountain permafrost and rock glaciers in the dry Andes are of growing interest due to the increase in mining industry and infrastructure development in this remote area. Empirical models of mountain permafrost distribution based on rock glacier activity status and temperature...
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fttriple:oai:gotriple.eu:10670/1.mc0p6c 2023-05-15T17:55:24+02:00 Permafrost distribution modelling in the semi-arid Chilean Andes Azócar, Guillermo Brenning, Alexander Bodin, Xavier Department of Geography and Environmental Management Waterloo University of Waterloo Waterloo Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 2017-01-01 https://doi.org/10.5194/tc-11-877-2017 https://hal-sde.archives-ouvertes.fr/hal-01880562 en eng HAL CCSD Copernicus hal-01880562 doi:10.5194/tc-11-877-2017 10670/1.mc0p6c https://hal-sde.archives-ouvertes.fr/hal-01880562 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere The Cryosphere, Copernicus 2017, 11 (2), pp.877 - 890. ⟨10.5194/tc-11-877-2017⟩ geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2017 fttriple https://doi.org/10.5194/tc-11-877-2017 2023-01-22T18:03:07Z International audience Mountain permafrost and rock glaciers in the dry Andes are of growing interest due to the increase in mining industry and infrastructure development in this remote area. Empirical models of mountain permafrost distribution based on rock glacier activity status and temperature data have been established as a tool for regional-scale assessments of its distribution; this kind of model approach has never been applied for a large portion of the Andes. In the present study, this methodology is applied to map permafrost favourability throughout the semi-arid Andes of central Chile (29–32°S), excluding areas of exposed bedrock. After spatially modelling of the mean annual air temperature distribution from scarce temperature records (116 station years) using a linear mixed-effects model, a generalized additive model was built to model the activity status of 3524 rock glaciers. A permafrost favourability index (PFI) was obtained by adjusting model predictions for conceptual differences between permafrost and rock glacier distribution. The results indicate that the model has an acceptable performance (median AUROC: 0.76). Conditions highly favourable to permafrost presence (PFI ≥ 0.75) are predicted for 1051km2 of mountain terrain, or 2.7% of the total area of the watersheds studied. Favourable conditions are expected to occur in 2636km2, or 6.8% of the area. Substantial portions of the Elqui and Huasco watersheds are considered to be favourable for permafrost presence (11.8% each), while in the Limarí and Choapa watersheds permafrost is expected to be mostly limited to specific sub-watersheds. In the future, local ground-truth observations will be required to confirm permafrost presence in favourable areas and to monitor permafrost evolution under the influence of climate change. Article in Journal/Newspaper permafrost The Cryosphere Unknown The Cryosphere 11 2 877 890 |
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geo envir Azócar, Guillermo Brenning, Alexander Bodin, Xavier Permafrost distribution modelling in the semi-arid Chilean Andes |
topic_facet |
geo envir |
description |
International audience Mountain permafrost and rock glaciers in the dry Andes are of growing interest due to the increase in mining industry and infrastructure development in this remote area. Empirical models of mountain permafrost distribution based on rock glacier activity status and temperature data have been established as a tool for regional-scale assessments of its distribution; this kind of model approach has never been applied for a large portion of the Andes. In the present study, this methodology is applied to map permafrost favourability throughout the semi-arid Andes of central Chile (29–32°S), excluding areas of exposed bedrock. After spatially modelling of the mean annual air temperature distribution from scarce temperature records (116 station years) using a linear mixed-effects model, a generalized additive model was built to model the activity status of 3524 rock glaciers. A permafrost favourability index (PFI) was obtained by adjusting model predictions for conceptual differences between permafrost and rock glacier distribution. The results indicate that the model has an acceptable performance (median AUROC: 0.76). Conditions highly favourable to permafrost presence (PFI ≥ 0.75) are predicted for 1051km2 of mountain terrain, or 2.7% of the total area of the watersheds studied. Favourable conditions are expected to occur in 2636km2, or 6.8% of the area. Substantial portions of the Elqui and Huasco watersheds are considered to be favourable for permafrost presence (11.8% each), while in the Limarí and Choapa watersheds permafrost is expected to be mostly limited to specific sub-watersheds. In the future, local ground-truth observations will be required to confirm permafrost presence in favourable areas and to monitor permafrost evolution under the influence of climate change. |
author2 |
Department of Geography and Environmental Management Waterloo University of Waterloo Waterloo Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Azócar, Guillermo Brenning, Alexander Bodin, Xavier |
author_facet |
Azócar, Guillermo Brenning, Alexander Bodin, Xavier |
author_sort |
Azócar, Guillermo |
title |
Permafrost distribution modelling in the semi-arid Chilean Andes |
title_short |
Permafrost distribution modelling in the semi-arid Chilean Andes |
title_full |
Permafrost distribution modelling in the semi-arid Chilean Andes |
title_fullStr |
Permafrost distribution modelling in the semi-arid Chilean Andes |
title_full_unstemmed |
Permafrost distribution modelling in the semi-arid Chilean Andes |
title_sort |
permafrost distribution modelling in the semi-arid chilean andes |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-877-2017 https://hal-sde.archives-ouvertes.fr/hal-01880562 |
genre |
permafrost The Cryosphere |
genre_facet |
permafrost The Cryosphere |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere The Cryosphere, Copernicus 2017, 11 (2), pp.877 - 890. ⟨10.5194/tc-11-877-2017⟩ |
op_relation |
hal-01880562 doi:10.5194/tc-11-877-2017 10670/1.mc0p6c https://hal-sde.archives-ouvertes.fr/hal-01880562 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-11-877-2017 |
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The Cryosphere |
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11 |
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2 |
container_start_page |
877 |
op_container_end_page |
890 |
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