Antarctic Sea Ice Enters 'Shock' Decline as Ocean Heat Breaks Through - ScienceAlert

A new analysis finds Antarctic sea ice has entered a rapid, 'shock' decline as ocean heat begins penetrating the Southern Ocean, overturning decades of apparent resistance to warming. The abrupt post‑2015 drop in seasonal ice appears linked to ocean warming breaking through and amplifying previously identified interacting physical drivers. That rapid loss is already reshaping ecosystems—favoring salps over krill—and raising near‑term risks for krill‑dependent predators, fisheries, carbon cycling, and coastal ice stability.