A stratospheric pathway linking a colder Siberia to Barents-Kara Sea sea ice loss

Previous studies have extensively investigated the impact of Arctic sea ice anomalies on the midlatitude circulation and associated surface climate in winter. However, there is an ongoing scientific debate regarding whether and how sea ice retreat results in the observed cold anomaly over the adjace...

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Published in:	Science advances 2018-07, Vol.4 (7), p.eaat6025-eaat6025
Main Authors:	Zhang, Pengfei, Wu, Yutian, Simpson, Isla R, Smith, Karen L, Zhang, Xiangdong, De, Bithi, Callaghan, Patrick
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Language:	eng
Subjects:	Atmospheric Science Climatology SciAdv r-articles
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title	A stratospheric pathway linking a colder Siberia to Barents-Kara Sea sea ice loss
format	Article
creator	Zhang, Pengfei Wu, Yutian Simpson, Isla R Smith, Karen L Zhang, Xiangdong De, Bithi Callaghan, Patrick
subjects	Atmospheric Science Climatology SciAdv r-articles
ispartof	Science advances, 2018-07, Vol.4 (7), p.eaat6025-eaat6025
description	Previous studies have extensively investigated the impact of Arctic sea ice anomalies on the midlatitude circulation and associated surface climate in winter. However, there is an ongoing scientific debate regarding whether and how sea ice retreat results in the observed cold anomaly over the adjacent continents. We present a robust "cold Siberia" pattern in the winter following sea ice loss over the Barents-Kara seas in late autumn in an advanced atmospheric general circulation model, with a well-resolved stratosphere. Additional targeted experiments reveal that the stratospheric response to sea ice forcing is crucial in the development of cold conditions over Siberia, indicating the dominant role of the stratospheric pathway compared with the direct response within the troposphere. In particular, the downward influence of the stratospheric circulation anomaly significantly intensifies the ridge near the Ural Mountains and the trough over East Asia. The persistently intensified ridge and trough favor more frequent cold air outbreaks and colder winters over Siberia. This finding has important implications for improving seasonal climate prediction of midlatitude cold events. The results also suggest that the model performance in representing the stratosphere-troposphere coupling could be an important source of the discrepancy between recent studies.
language	eng
source	American Association for the Advancement of Science; Open Access: PubMed Central; Scholars Portal Open Access Journals
identifier	ISSN: 2375-2548
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