‘Everyone should be concerned’: Antarctic sea ice reaches lowest levels ever recorded
https://www.theguardian.com/world/2023/mar/04/everyone-should-be-concerned-antarctic-sea-ice-reaches-lowest-levels-ever-recorded
Excerpt: For 44 years, satellites have helped scientists track how much ice is floating on the ocean around Antarctica’s 18,000km coastline. The continent’s fringing waters witness a massive shift each year, with sea ice peaking at about 18m sq km each September before dropping to just above 2m sq km by February. But across those four decades of satellite observations, there has never been less ice around the continent than there was last week. ...Hobbs and other scientists said the new record – the third time it’s been broken in six years – has started a scramble for answers among polar scientists. The fate of Antarctica – especially the ice on land – is important because the continent holds enough ice to raise sea levels by many metres if it was to melt. While melting sea ice does not directly raise sea levels because it is already floating on water, several scientists told the Guardian of knock-on effects that can. ...Sea ice helps to buffer the effect of storms on ice attached to the coast. If it starts to disappear for longer, the increased wave action can weaken those floating ice shelves that themselves stabilise the massive ice sheets and glaciers behind them on the land....