Abstract:
:Successive cold winters of severely low temperatures in recent years have had critical social and economic impacts on the mid-latitude continents in the Northern Hemisphere. Although these cold winters are thought to be partly driven by dramatic losses of Arctic sea-ice, the mechanism that links sea-ice loss to cold winters remains a subject of debate. Here, by conducting observational analyses and model experiments, we show how Arctic sea-ice loss and cold winters in extra-polar regions are dynamically connected through the polar stratosphere. We find that decreased sea-ice cover during early winter months (November-December), especially over the Barents-Kara seas, enhances the upward propagation of planetary-scale waves with wavenumbers of 1 and 2, subsequently weakening the stratospheric polar vortex in mid-winter (January-February). The weakened polar vortex preferentially induces a negative phase of Arctic Oscillation at the surface, resulting in low temperatures in mid-latitudes.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Kim BM,Son SW,Min SK,Jeong JH,Kim SJ,Zhang X,Shim T,Yoon JHdoi
10.1038/ncomms5646subject
Has Abstractpub_date
2014-09-02 00:00:00pages
4646issn
2041-1723pii
ncomms5646journal_volume
5pub_type
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