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Permafrost Favorability Index Map (PFI) for the Chilean Semi-Arid Andes (2016)

Azócar, Guillermo ; Brenning, Alexander ; Bodin, Xavier

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In: Supplement to: Azócar, Guillermo; Brenning, Alexander; Bodin, Xavier (2016): Permafrost Distribution Modeling in the Semi-Arid Chilean Andes. The Cryosphere, 11, 877-890, https://doi.org/10.5194/tc-2016-100

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Publication Date: 2024-04-19

Description: The Permafrost Favorability Index (PFI) map for the Chilean Semi-Arid Andes (29°S-32°S) indicates where permafrost is likely to occur (resolution 30 m x 30 m). The predicted favorability of permafrost occurrence ranges between 0 and 1, where high PFI values indicate most favorable environmental conditions for permafrost existence and low values indicates that permafrost will be present in exceptional circumstances with favorable local conditions. Conditions highly favorable to permafrost presence (PFI 〉 0.75) are predicted for 1051 km² of mountain terrain, or 2.7 % of the total area of the watersheds studied. Favorable conditions are expected to occur in 2636 km², or 6.8% of the area. Especially the Elqui and Huasco watersheds in the northern half of the study area where a substantial surface portion (11.8 % each) was considered to be favorable for permafrost presence, while predicted favorable areas in the southern Limarí and Choapa watersheds are mostly limited to specific sub-watersheds.

Keywords: Chilean_Semi-Arid_Andes; Description; File name; File size; South America, Chile; Uniform resource locator/link to file

Type: Dataset

Format: text/tab-separated-values, 32 data points

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Permafrost distribution modelling in the semi-arid Chilean Andes (2017)

Azócar, Guillermo F. ; Brenning, Alexander ; Bodin, Xavier

Copernicus

In: The Cryosphere. 2017; 11(2): 877-890. Published 2017 Apr 06. doi: 10.5194/tc-11-877-2017.

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Publication Date: 2017-04-06

Description: 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 1051 km2 of mountain terrain, or 2.7 % of the total area of the watersheds studied. Favourable conditions are expected to occur in 2636 km2, 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.

Print ISSN: 1994-0416

Electronic ISSN: 1994-0424

Topics: Geography , Geosciences