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. Quantifying ground-ice volume on a regional scale is necessary to assess thevulnerability of permafrost landscapes to thaw-induced disturbance like terrain subsidence and toquantify potential carbon release. Ice wedges (IWs) are a ubiquitousground-ice landform in the Arctic. Their high spatial variability makesgeneralizing their potential role in landscape change problematic. IWs formpolygonal networks that are visible on satellite imagery from surfacetroughs. This study provides a first approximation of IW ice volume for theFosheim Peninsula, Ellesmere Island, a continuous permafrost areacharacterized by polar desert conditions and extensive ground ice. We performbasic GIS analyses on high-resolution satellite imagery to delineate IWtroughs and estimate the associated IW ice volume using a 3-D subsurfacemodel. We demonstrate the potential of two semi-automated IW troughdelineation methods, one newly developed and one marginally used in previousstudies, to increase the time efficiency of this process compared to manualdelineation. Our methods yield acceptable IW ice volume estimates, validatingthe value of GIS to estimate IW volume on much larger scales. We estimatethat IWs are potentially present on 50 % of the Fosheim Peninsula (∼3000 km2), where 3.81 % of the top 5.9 m of permafrost could beIW ice.

An estimate of ice wedge volume for a High Arctic polar desert environment, Fosheim Peninsula, Ellesmere Island