Axel Schweiger, principal scientist and chair at the University of Washington's Polar Science Center, prepares one of five Dropsonde sensors for deployment while aboard a Coast Guard HC-130 Hercules airplane above the Beaufort Sea north of Alaska, Tuesday, July 16, 2013. The Dropsonde sensors collect temperature, humidity and wind readings as they travel from 10,000 feet to sea level. (U.S. Coast Guard photo by Petty Officer 1st Class Sara Mooers)
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