Mapping the Thaw

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Scientists have been tracking seasonal freeze-thaw patterns for 30 years. This map, produced from data collected by NASA’s Soil Moisture Active Passive satellite, “shows the freeze-thaw status of areas north of 45 degrees latitude on March 5, 2015, as spring approached. Frozen land is blue; thawed land is pink. The measurement is possible because frozen water forms crystalline structures that can be detected by satellites.” NASA Earth Observatory.

Author: Jonathan Crowe

I blog about maps at The Map Room, review books for AE: The Canadian Science Fiction Review, and edit a fanzine called Ecdysis.