Journal article

Changes in Atmospheric Blocking Circulations Linked with Winter Arctic Warming: A New Perspective

Dehai Luo, Xiaodan Chen, Aiguo Dai, Ian Simmonds

JOURNAL OF CLIMATE | AMER METEOROLOGICAL SOC | Published : 2018

Abstract

Winter atmospheric blocking circulations such as Ural blocking (UB) have been recognized to play an important role in recent winter Eurasian cooling. Observational analyses performed here reveal that the winter warming in the Barents-Kara Seas (BKS) related to the recent decline of sea ice concentration (SIC) has been accompanied by a large increase in the mean duration of the UB events. A new energy dispersion index (EDI) is designed to help reveal the physics behind this association and show how the BKS warming can influence the mean duration of UB events. This EDI mainly reflects the role of the meridional potential vorticity (PV) gradient in the blocking persistence and it characterizes ..

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Grants

Awarded by National Natural Science Foundation of China


Awarded by Chinese Academy of Sciences Strategic Priority Research Program


Awarded by U.S. National Science Foundation


Awarded by U.S. Department of Energy's Office of Science


Awarded by U.S. National Oceanic and Atmospheric Administration


Awarded by Australian Research Council


Funding Acknowledgements

The first two authors acknowledge the support from the National Natural Science Foundation of China (Grant 41430533) and Chinese Academy of Sciences Strategic Priority Research Program (Grant XDA 19070403). Dai was partly supported by the U.S. National Science Foundation (Grant AGS-1353740), U.S. Department of Energy's Office of Science (Award DE-SC0012602), and the U.S. National Oceanic and Atmospheric Administration (Award NA15OAR4310086). Simmonds was funded, in part, by Australian Research Council Grant DP160101997. The authors thank three anonymous reviewers for their very helpful suggestions that greatly improved the paper.