Abstract
Climatology Winters have been more severe in Siberia over the past decade, even while loss of sea ice indicates dramatic warming of the Arctic. One hypothesis proposed to explain this apparent paradox is that Arctic sea ice loss forces a change in atmospheric circulation patterns that leads to colder Siberian winters. Using comprehensive atmospheric circulation models, Zhang et al. demonstrate that late autumn sea ice loss in the Barents-Kara Seas should result in a colder climate in Siberia the following winter. Their experiments also suggest that changes in the stratosphere, particularly shifts in and weakening of the stratospheric polar vortex owing to a reduction in sea ice, contribute substantially to the severity of winters in Siberia. Sci. Adv. 10.1126/sciadv.aat6025 (2018).
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