期刊
ENVIRONMENTAL RESEARCH LETTERS
卷 8, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1748-9326/8/2/025007
关键词
multi-temporal image analysis; active-contouring; normalized difference index; COSI-Corr; permafrost degradation; thaw lakes; ice-wedge polygons; thermokarst; Kobuk Valley National Park
资金
- SwRI(R)'s Earth Observation Systems for Climate Change Impact Assessments (EOS CCIA) research initiative
Multi-temporal image analysis of very-high-resolution historical aerial and recent satellite imagery of the Ahnewetut Wetlands in Kobuk Valley National Park, Alaska, revealed the nature of thaw lake and polygonal terrain evolution over a 54-year period of record comprising two 27-year intervals (1951-1978, 1978-2005). Using active-contouring-based change detection, high-precision orthorectification and co-registration and the normalized difference index, surface area expansion and contraction of 22 shallow water bodies, ranging in size from 0.09 to 179 ha, and the transition of ice-wedge polygons from a low-to a high-centered morphology were quantified. Total surface area decreased by only 0.4% during the first time interval, but decreased by 5.5% during the second time interval. Twelve water bodies (ten lakes and two ponds) were relatively stable with net surface area decreases of <= 10%, including four lakes that gained area during both time intervals, whereas ten water bodies (five lakes and five ponds) had surface area losses in excess of 10%, including two ponds that drained completely. Polygonal terrain remained relatively stable during the first time interval, but transformation of polygons from low-to high-centered was significant during the second time interval.
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