Abstract
The recent decline in the Arctic sea ice has coincided with more cold winters in Eurasia. It has been hypothesized that the Arctic sea ice loss is causing more mid-latitude cold extremes and cold winters, yet there is lack of consensus in modeling studies on the impact of Arctic sea ice loss. Here we conducted modeling experiments with Community Atmosphere Model Version 5 (CAM5) to investigate the sensitivity and linearity of Eurasian winter temperature response to the Atlantic sector and Pacific sector of the Arctic sea ice loss. Our experiments indicate that the Arctic sea ice reduction can significantly affect the atmospheric circulation by strengthening the Siberian High, exciting the stationary Rossby wave train, and weakening the polar jet stream, which in turn induce the cooling in Eurasia. The temperature decreases by more than 1°C in response to the ice loss in the Atlantic sector and the cooling is less and more shifts southward in response to the ice loss in the Pacific sector. More interestingly, sea ice loss in the Atlantic and Pacific sectors together barely induces cold temperatures in Eurasia, suggesting the nonlinearity of the atmospheric response to the Arctic sea ice loss.
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Acknowledgements
The authors are grateful to Sun Lantao for the discussion, and three anonymous reviewers for the valuable suggestions and comments.
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Foundation item: The Chinese Polar Environment Comprehensive Investigation and Evaluation Programmes under contract No. CHINARE2016-04-04; the Public Science and Technology Research Funds Projects of Ocean under contract No. 201505013; the National Natural Science Foundation of China (NSFC) under contract No. 41576029.
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Sui, C., Zhang, Z., Yu, L. et al. Sensitivity and nonlinearity of Eurasian winter temperature response to recent Arctic sea ice loss. Acta Oceanol. Sin. 36, 52–58 (2017). https://doi.org/10.1007/s13131-017-1018-y
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DOI: https://doi.org/10.1007/s13131-017-1018-y