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- W2174996858 abstract "Abstract High‐resolution maps of potential frozen ground distribution in South America have been produced for the present day (0 ka) and the Last Glacial Maximum (21 ka). Surface air temperature outputs from global climate models (GCMs) of the recent Paleoclimate Model Intercomparison Project were used for the reconstructions, and then downscaled from regional to local scales, with the help of a 1 arc‐minute digital elevation model. Their validity was examined using fieldwork‐based evidence and knowledge. The downscaled map for the present day successfully reproduces the presence of permafrost in the Andes, a task at which original coarse‐resolution GCM output maps failed. The map also shows close correspondence with instrumental observations. Similarly, the downscaled distribution of 21 ka frozen ground shows overall consistency with geomorphological and/or palaeoenvironmental reconstructions. Areal coverage of potential permafrost for all of South America is estimated at 139 000 km 2 for today and 435 000 km 2 for 21 ka, mostly along the Andean mountain ranges. Regional inspections, however, show divergence from field‐observed features, attributed to microclimatic effects and past permafrost conditions. For southern Patagonia, and especially the eastern lowlands, the diagnosed lower limit for permafrost is about 1000 m asl, whereas field evidence at lower altitudes indicates the presence of either permafrost or deep seasonal frost. Copyright © 2015 John Wiley & Sons, Ltd." @default.
- W2174996858 created "2016-06-24" @default.
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- W2174996858 date "2015-11-16" @default.
- W2174996858 modified "2023-10-16" @default.
- W2174996858 title "Late Quaternary Permafrost Distributions Downscaled for South America: Examinations of GCM-based Maps with Observations" @default.
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- W2174996858 doi "https://doi.org/10.1002/ppp.1863" @default.
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