After Hitting Record-High Extent In 2014, Antarctic Sea Ice Area Record Low In 2017
Floating ice off the southern continent steadily increased from 1979 and hit a record high in 2014. But three years later, the annual average extent of Antarctic sea ice hit its lowest mark, wiping out three-and-a-half decades of gains — and then some, a NASA study of satellite data shows. In recent years, “things have been crazy,” said Mark Serreze, director of the National Snow and Ice Data Center. In an email, he called the plummeting ice levels “a white-knuckle ride.”
Serreze and other outside experts said they don’t know if this is a natural blip that will go away or more long-term global warming that is finally catching up with the South Pole. Antarctica hasn’t showed as much consistent warming as its northern Arctic cousin. “But the fact that a change this big can happen in such a short time should be viewed as an indication that the Earth has the potential for significant and rapid change,” University of Colorado ice scientist Waleed Abdalati said in an email.
At the polar regions, ice levels grow during the winter and shrink in the summer. Around Antarctica, sea ice averaged 4.9 million square miles (12.8 million square kilometers) in 2014. By 2017, it was a record low of 4.1 million square miles (10.7 million square kilometers, according to the study in Monday’s Proceedings of the National Academy of Sciences.
The difference covers an area bigger than the size of Mexico. Losing that much in just three years “is pretty incredible” and faster than anything scientists have seen before, said study author Claire Parkinson, a NASA climate scientist. Antarctic sea ice increased slightly in 2018, but still was the second lowest since 1979. Even though ice is growing this time of year in Antarctica, levels in May and June this year were the lowest on record, eclipsing 2017, according to the ice data center.
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