Topographic Asymmetry Across the Arctic

Abstract

AbstractAspect‐dependent differences in steepness provide insight into the fate and formation of permafrost‐affected landscapes, but the circum‐Arctic distribution of topographic asymmetry remains unknown. The maps derived here add nuance to the notion that periglacial conditions promote steeper north‐facing slopes. Only 20% of the area exhibits elevated north–south asymmetry, chiefly in rugged terrain. Across all moderate‐relief landscapes, there is a bell‐shaped trend with temperature. Steeper south‐facing slopes are common in very cold and cool regions. In between, steeper north‐facing slopes predominate. Despite multiple caveats, the bell‐shaped trend with temperature suggests controls that vary with climatic factors, including permafrost conditions. The bell‐shaped trend and observations of permafrost degradation further indicate that certain asymmetric transition‐zone landscapes are predisposed to enhanced geomorphic activity in a warming climate.