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A glitch in satellite sensors caused scientists to underestimate the extent of Arctic sea ice by 500,000 square kilometers (193,000 square miles), a California- size area, the U.S. National Snow and Ice Data Center said.
The error, due to a problem called “sensor drift,” began in early January and caused a slowly growing underestimation of
sea ice extent until mid-February. That’s when “puzzled readers” alerted the NSIDC about data showing ice-covered areas
as stretches of open ocean, the Boulder, Colorado-based group said on its Web site.
Original article here..
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