PLEA Network

13 September 2023, The Conversation: Devastatingly low Antarctic sea ice may be the ‘new abnormal’, study warns. For most of us, Antarctic sea ice is an abstraction – something far away we may have seen on a documentary. But the radiant white sheets of ice floating on the seas around the snowy continent are a crucial component of Earth’s climate processes. Sea ice insulates the ocean, reflects heat, drives currents, supports ecosystems and protects ice shelves. It also has an annual seasonal cycle – some of the ice melts, then freezes again. Every year, the cycle of freeze and melt around Antarctica has been extremely reliable. Until recently. In a new study published today in Communications Earth & Environment, we have found a preliminary indication that Antarctic sea ice may have entered a new state of diminished coverage. A sudden, dramatic loss. For many years, while the Arctic lost sea ice, the Antarctic did not. Then, in the spring of 2016, Antarctic sea-ice coverage dropped dramatically. Over two years, the Antarctic lost as much sea ice as the Arctic had lost in three decades. Since then, Antarctic sea ice has been below average almost constantly. This past Southern Hemisphere summer, Antarctic sea ice was the lowest it has ever been, with dire consequences. In late 2022 we saw the heartbreaking loss of 10,000 emperor penguin chicks, when the sea ice they lived on melted before they had grown their waterproof feathers. On February 19 2023, Antarctic sea ice set a new record minimum of 1.77 million square kilometres, 36% below the 1979–2022 average for the summer minimum. Read more here