Melting ice is an emblem of climate change. For sea ice, the Arctic has been grabbing most of the headlines for its truly alarming rate of decline. But recently Antarctica has followed suit.
Around ten years ago everything changed. After decades of stability and within just a few years, an ocean area nearly the size of Greenland suddenly became sea-ice free. At first, scientists thought this could be a blip, but now it is described as a step change, with large ocean areas remaining ice free ever since.
This has dramatic consequences for the marine life of Antarctica. The ice decline was so sudden it challenged most existing computer models of the Southern Ocean and its ecosystems. Models tend not to predict step changes very well. Likewise, due to the sheer seismic suddenness of ice loss, the boots-on-the-ground fieldworkers could not scramble fast enough to document how the loss of sea ice was affecting the plants and animals living here.
