Journal article
Changes in atmospheric blocking circulations linked with winter Arctic warming: A new perspective
D Luo, X Chen, A Dai, I 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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Awarded by National Oceanic and Atmospheric Administration
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.