Effect of the climate shift around mid 1970s on the relationship between wintertime Ural blocking circulation and East Asian climate

Blocking variability over the Ural Mountain region in the boreal winter and its relationship with the East Asian winter climate is investigated. The climate shift around mid 1970s has been shown to exert a significant influence on the blocking pattern. In contrast with the years before 1976/1977, th...

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Bibliographic Details
Published in:International Journal of Climatology
Main Authors: Wang, Lin, Chen, Wen, Zhou, Wen, Chan, Johnny C. L., Barriopedro Cepero, David, Huang, Ronghui
Format: Article in Journal/Newspaper
Language:English
Published: John WiIley & Sons LTD 2010
Subjects:
Astrofísica
Astronomía
Física atmosférica
North Atlantic
Online Access:https://eprints.ucm.es/id/eprint/24422/
https://eprints.ucm.es/id/eprint/24422/1/barriopedro14libre.pdf
https://doi.org/10.1002/joc.1876
Description
Summary:Blocking variability over the Ural Mountain region in the boreal winter and its relationship with the East Asian winter climate is investigated. The climate shift around mid 1970s has been shown to exert a significant influence on the blocking pattern. In contrast with the years before 1976/1977, the Ural blocking signal after 1976/1977 is found to propagate less into the stratosphere and more eastward in the troposphere to East Asia, which therefore exerts more influence on the East Asian winter climate. This enhanced Ural blocking-East Asian climate relationship amplifies the impact of Ural blocking on East Asia and, with the background of decreasing Ural blocking, contributes to the higher frequency of warm winters in this region. Further analyses suggest that the NAM-related stratospheric polar vortex strength and its modulation on the propagation of atmospheric stationary waves can account for this change, with the key area being located in the North Atlantic region.

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