Roger Andersen, senior mathematician at the University of Washington's Polar Science Center, calibrates receiving equipment to collect air sample data from a Dropsonde sensor aboard a Coast Guard HC-130 Hercules airplane above the Beaufort Sea north Alask

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Roger Andersen, senior mathematician at the University of Washington's Polar Science Center, calibrates receiving equipment to collect air sample data from a Dropsonde sensor aboard a Coast Guard HC-130 Hercules airplane above the Beaufort Sea north Alaska, Tuesday, July 16, 2013. The Dropsonde sensor collects temperature, humidity and wind readings as it travels from 10,000 feet to sea level.

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