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Antarctic sea ice has likely reached its maximum extent for the year, at 17.16 million square kilometers (6.63 million square miles) on September 19, according to scientists at the National Snow and Ice Data Center (NSIDC) at the University of Colorado Boulder (CU Boulder).
On Sept. 19 this year, for the first time ever since 1979, Antarctic sea ice extent exceeded 7.72 million square miles (20 million square kilometers), according to the National Snow and Ice Data Center. The ice extent stayed above this benchmark extent for several days.
The sea ice in the Southern Ocean around Antarctica sea ice probably reached its winter maximum extent on September 19, 2024. It was second smallest of the satellite record, only slightly above the extreme record low set in 2023.
In February 2023, Antarctic sea ice set a record minimum; there have now been three record-breaking low sea ice summers in seven years.
Antarctica's sea ice is now reforming as the continent moves deeper into the austral winter, but it's currently the smallest it has ever been for this time of year on record.
On September 10, 2023, sea ice in the Antarctic reached an annual maximum extent of 16.96 million square kilometers (6.55 million square miles), setting a record low maximum in the satellite record that began in 1979. This year’s maximum is 1.03 million square kilometers (398,000 square miles) below the previous record low set in 1986.
Antarctic sea ice has likely reached its maximum extent for the year, at 16.96 million square kilometers (6.55 million square miles) on September 10, according to scientists at the National Snow and Ice Data Center (NSIDC) at the University of Colorado Boulder.