Journal
PERMAFROST AND PERIGLACIAL PROCESSES
Volume 25, Issue 3, Pages 151-161Publisher
WILEY
DOI: 10.1002/ppp.1810
Keywords
permafrost; ground ice; polygonal networks; GIS; remote sensing; Arctic
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Funding
- German Federal Ministry of Science and Education [01DM12011]
- joint Russian-German project Polygons in Tundra Wetlands: State and Dynamics under Climate Variability in Polar Regions (German Research Foundation (DFG) [HE3622-16-1]
- DFG [UL426/1-1]
- NSF OPP (National Science Foundation Office for Polar Programs) [0732735]
- NASA [NNX08AJ37G]
- European Research Council (ERC) Starting Grant [338335]
- German National Academic Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [0732735] Funding Source: National Science Foundation
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Wedge-ice volume (WIV) is a key factor in assessing the response of ice-rich permafrost landscapes to thaw and in quantifying deep permafrost soil carbon inventories. Here, we present a method for calculating WIV in late Pleistocene Yedoma deposits and Holocene thermokarst basin deposits at four study areas in Siberia and Alaska. Ice-wedge polygons and thermokarst mound (baydzherakh) patterns were mapped on different landscape units using very high-resolution (0.5 m/pixel) satellite imagery (WorldView-1 and GeoEye-1). In a geographic information system (GIS) environment, Thiessen polygons were automatically created to reconstruct relict ice-wedge polygonal networks, and field and published data on ice-wedge dimensions were used to generate three-dimensional subsurface models that distinguish between epi- and syngenetic ice-wedge geometry. The results reveal significant variations in WIV between the study sites and within certain terrain units. Calculated maximum WIV ranges from 31.4 to 63.2 vol% for Yedoma deposits and from 6.6 to 13.2 vol% for thermokarst basin deposits. Copyright (C) 2014 John Wiley & Sons, Ltd.
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