GEOSCAN, résultats de la recherche


TitreModelling and mapping climate change impacts on permafrost at high spatial resolution for an Arctic region with complex terrain
AuteurZhang, Y; Wang, X; Fraser, R; Olthof, I; Chen, W; McLennan, D; Ponomarenko, S; Wu, W
SourceThe Cryosphere vol. 7, 2013 p. 1121-1137, (Accès ouvert)
Séries alt.Secteur des sciences de la Terre, Contribution externe 20120211
ÉditeurCopernicus GmbH
Documentpublication en série
Mediapapier; en ligne; numérique
SNRC117A/11; 117A/12; 117A/13; 117A/14; 117B/09; 117B/10; 117C/01; 117C/08; 117D/03; 117D/04; 117D/05
Lat/Long OENS-141.0000 -138.0000 69.7500 68.5000
Sujetspergélisol; congélation du sol; glace fossile; températures au sol; modèles; établissement de modèles; climat arctique; climat; télédétection; changement climatique; géologie des dépôts meubles/géomorphologie; géophysique; Nature et environnement; Cénozoïque; Quaternaire
Illustrationslocation maps; images; plots; tables
ProgrammeScience de la télédétection spatiale, Caractérisation de la surface terrestre
Diffusé2013 07 18
Résumé(disponible en anglais seulement)
Most spatial modelling of climate change impacts on permafrost has been conducted at half-degree latitude/longitude or coarser spatial resolution. At such coarse resolution, topographic effects on insolation cannot be considered accurately and the results are not suitable for land-use planning and ecological assessment. Here we mapped climate change impacts on permafrost from 1968 to 2100 at 10 m resolution using a process-based model for Ivvavik National Park, an Arctic region with complex terrain in northern Yukon, Canada. Soil and drainage conditions were defined based on ecosystem types, which were mapped using SPOT imagery. Leaf area indices were mapped using Landsat imagery and the ecosystem map. Climate distribution was estimated based on elevation and station observations, and the effects of topography on insolation were calculated based on slope, aspect and viewshed. To reduce computation time, we clustered climate distribution and topographic effects on insolation into discrete types. The modelled active-layer thickness and permafrost distribution were comparable with field observations and other studies. The map portrayed large variations in active-layer thickness, with ecosystem types being the most important controlling variable, followed by climate, including topographic effects on insolation. The results show deepening in active-layer thickness and progressive degradation of permafrost, although permafrost will persist in most of the park during the 21st century. This study also shows that ground conditions and climate scenarios are the major sources of uncertainty for high-resolution permafrost mapping.