In the Arctic, sea ice is at its sixth-lowest extent since records began
to an end in Antarctica, while summer is wrapping up at the other end of the globe. During this time, sea ice in the south reaches its highest yearly extent, whereas in the north it drops to its annual minimum.than expected in the early parts of the southern winter. As a result, despite a spurt in early September, when the sea ice grew more than twice as rapidly as is usual, the ice now falls far short of the average maximum observed at this time of year.
The same long-term trend has not been in evidence around Antarctica. Its apron of sea ice had been stable until 2014; at times it even increased. This difference between the two poles puzzled scientists. “Climate models have all shown that Antarctic ice should be shrinking just like in the Arctic in response to anthropogenic warming,” says Professor Julienne Stroeve of the NSIDC.
But it is hard to imagine that this year’s low maximum in Antarctic sea ice, coming as it does after three record low minimums, can be explained entirely by natural variability. One recent paper suggests that, having previously been controlled in large part by the winds, the sea ice is now coming under the thrall of steadily warming waters below the surface.
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