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- H13X-1411: Near Daily Ice Cover Records from 100,000 Lakes Using Optical Satellite Imagery
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Board 1411‚ Hall EFG (Poster Hall)NOLA CC
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Audrey Thellman, University of California Santa Barbara (First Author, Presenting Author)
Tamlin Pavelsky, University of North Carolina at Chapel Hill
Xiao Yang, Southern Methodist University
As global temperatures climb, lake ice is declining. Evidence of lake ice loss comes from hundreds of valuable lake ice records where researchers, volunteers, or other people estimate when the lake is fully frozen or when the lake is ice-free. We can use photos of lake ice taken from space (satellite imagery) to estimate lake ice cover. Using satellite imagery, we can increase our the number of lake ice observations from hundreds of lakes to 100,000s of lakes globally. To estimate lake ice cover, we combine several proven lake ice models and data from multiple satellites (e.g. MODIS, Landsat) to automatically predict lake ice on the near daily timestep for 100,000s of sufficiently large lakes (> 1km2) . We applied several filters on the resulting ice cover records: first, only assuming ice cover when temperatures are freezing, and second, only including ice cover data from when the satellite images have enough light. The resulting records were compared to the ice records taken by observers. The new dataset provides ice cover over the entire lake and estimates daily ice cover instead of ice duration derived from the breakup and freeze-up dates, on a global scale.
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