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Remote Sens. 2016, 8(3), 218;

InSAR Detection and Field Evidence for Thermokarst after a Tundra Wildfire, Using ALOS-PALSAR

International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
National Institute for Environmental Studies, Tsukuba 305-8506, Japan
Earth System Science Programme, Faculty of Science, Chinese University of Hong Kong, Hong Kong, China
Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
The Remote Sensing Technology Center of Japan, Tsukuba 305-0032, Japan
Author to whom correspondence should be addressed.
Academic Editors: Zhong Lu and Prasad S. Thenkabail
Received: 22 December 2015 / Revised: 20 February 2016 / Accepted: 1 March 2016 / Published: 8 March 2016
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Thermokarst is the process of ground subsidence caused by either the thawing of ice-rich permafrost or the melting of massive ground ice. The consequences of permafrost degradation associated with thermokarst for surface ecology, landscape evolution, and hydrological processes have been of great scientific interest and social concern. Part of a tundra patch affected by wildfire in northern Alaska (27.5 km2) was investigated here, using remote sensing and in situ surveys to quantify and understand permafrost thaw dynamics after surface disturbances. A two-pass differential InSAR technique using L-band ALOS-PALSAR has been shown capable of capturing thermokarst subsidence triggered by a tundra fire at a spatial resolution of tens of meters, with supporting evidence from field data and optical satellite images. We have introduced a calibration procedure, comparing burned and unburned areas for InSAR subsidence signals, to remove the noise due to seasonal surface movement. In the first year after the fire, an average subsidence rate of 6.2 cm/year (vertical) was measured. Subsidence in the burned area continued over the following two years, with decreased rates. The mean rate of subsidence observed in our interferograms (from 24 July 2008 to 14 September 2010) was 3.3 cm/year, a value comparable to that estimated from field surveys at two plots on average (2.2 cm/year) for the six years after the fire. These results suggest that this InSAR-measured ground subsidence is caused by the development of thermokarst, a thawing process supported by surface change observations from high-resolution optical images and in situ ground level surveys. View Full-Text
Keywords: fire; PALSAR; InSAR; subsidence; thermokarst; ALOS; tundra; L-band; Anaktuvuk fire; PALSAR; InSAR; subsidence; thermokarst; ALOS; tundra; L-band; Anaktuvuk

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Iwahana, G.; Uchida, M.; Liu, L.; Gong, W.; Meyer, F.J.; Guritz, R.; Yamanokuchi, T.; Hinzman, L. InSAR Detection and Field Evidence for Thermokarst after a Tundra Wildfire, Using ALOS-PALSAR. Remote Sens. 2016, 8, 218.

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