
Image caption
Sea ice concentration on March 21,2021—the day of the winter maximum extent. The gold line shows the median extent based on data from 1981-2020. Map by NOAA Climate.gov, based on data from NSIDC.
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Sea ice concentration on March 21,2021—the day of the winter maximum extent. The gold line shows the median extent based on data from 1981-2020. Map by NOAA Climate.gov, based on data from NSIDC.