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ire-induced permafrost degradation is well documented in boreal forests, but the role of fires in initiating thermokarst development in Arctic tundra is less well understood. Here we show that Arctic tundra fires may induce widespread thaw subsidence of permafrost terrain in the first seven years following the disturbance. Quantitative analysis of airborne LiDAR data acquired two and seven years post-fire, detected permafrost thaw subsidence across 34% of the burned tundra area studied, compared to less than 1% in similar undisturbed, ice-rich tundra terrain units. The variability in thermokarst development appears to be influenced by the interaction of tundra fire burn severity and near-surface, ground-ice content....
The 2007 Anaktuvuk River Fire was an order of magnitude larger than the average fire sizein the historic record for northern Alaska and indices of severity were substantially higherthan for other recorded tundra burns. An interdisciplinary team assessed fire effectsincluding burn severity, potential plant community shifts, and effects on permafrost andactive layers. Observers monumented, photographed, and measured 24 burned and 17unburned reference transects, starting the year after the fire, and spanning the range ofvegetation types and burn severities. Three independent ocular estimates of burn severityat varying scales were made, two ground-based indices and one aerial index. Remotelysensed data and indices were...
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