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As summer sea ice shrinks, the ice edge-the perimeter of the ice pack that remains-will retreat farther north. Meanwhile, the satellites that observe the ice can see almost as far north as the North Pole-but not quite. Historically, National Snow and Ice Data Center (NSIDC) scientists have handled the data gap over the North Pole by assuming it was ice-filled. Now, scientists and data managers at institutions such as the NSIDC are looking for ways to cope with a situation that was once unexpected, open water at the North Pole. [Source: NASA Earth Observatory]
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