Not exactly shocking news, James Annan reports on the recent paper investigating:
how much of the decline in sea ice was plausibly due to various natural phenomena like the Atlantic Multidecadal Oscillation and Arctic Oscillation. The answer…maybe a little, but not a lot.
We could only attribute as much as 30% [of the Arctic ice loss] to the AMO [Atlantic multi-decadal oscillation],” he said. “Which implies that the rest is due to something else, and this is most likely going to be man-made global change.”
Previous studies had indicated that around half of the loss was due to man-made climate change and that the other half was due to natural variability.
Looking across all his simulations, Day found that the 30% figure was an upper limit – the AMO could have contributed as little as 5% to the overall loss of Arctic ice in recent decades.