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Two distinctive influences of Arctic warming on cold winters over North America and East Asia

Cited 102 time in scopus
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Title
Two distinctive influences of Arctic warming on cold winters over North America and East Asia
Other Titles
북미와 동아시아 한파를 유발시키는 두가지 구별되는 북극온난화 패턴과 그 영향
Authors
Kug, Jong-Seong
Son, Seok-Woo
Chris Folland
Min, Seung-Ki
Kim, Baek-Min
장연수
Jeong, Jee-Hoon
Keywords
Arctic Sea-ice Loss; Arctic Warming; Cold Winter
Issue Date
2015
Citation
Kug, Jong-Seong, et al. 2015. "Two distinctive influences of Arctic warming on cold winters over North America and East Asia". NATURE GEOSCIENCE, 8(10): 759-762.
Abstract
Arctic warming has sparked a growing interest because of its possible impacts on mid-latitude climate1-5. A number of unusually harsh cold winters have occurred in many parts of East Asia and North America in the past few years2,6,7, and observational and modelling studies have suggested that atmospheric variability linked to Arctic warming might have played a central role13,4,8-11. Here we identify two distinct influences of Arctic warming which may lead to cold winters over East Asia or North America, based on observational analyses and extensive climate model results. We find that severe winters across East Asia are associated with anomalous warmth in the Barents-Kara Sea region, whereas severe winters over North America are related to anomalous warmth in the East Siberian-Chukchi Sea region. Each regional warming over the Arctic Ocean is accompanied by the local development of an anomalous anticyclone and the downstream development of a mid-latitude trough. The resulting northerly flow of cold air provides favourable conditions for severe winters in East Asia or North America. These links between Arctic and mid-latitude weather are also robustly found in idealized climate model experiments and CMIP5 multi-model simulations. We suggest that our results may help improve seasonal prediction of winter weather and extreme events in these regions.
URI
http://repository.kopri.re.kr/handle/201206/7357
DOI
http://dx.doi.org/10.1038/ngeo2517
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