This article discusses how floating Antarctic ice goes from record high to record lows.
The amount of ice circling Antarctica is suddenly plunging from a record high to record lows, baffling scientists.
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.
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.