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

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Wang, Lin and Chen, Wen and Zhou, Wen and Chan, Johnny C. L. and Barriopedro Cepero, David and Huang, Ronghui (2010) Effect of the climate shift around mid 1970s on the relationship between wintertime Ural blocking circulation and East Asian climate. International journal of climatology, 30 (1). pp. 153-158. ISSN 0899-8418

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Official URL: http://dx.doi.org/10.1002/joc.1876




Abstract

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.


Item Type:Article
Additional Information:

© 2009 Royal Meteorological Society. This work is supported jointly by the National Natural Science Foundation of China (Grant 40775035) and City University of Hong Kong (Grants 7002136 and 9610021).

Uncontrolled Keywords:Weather regimes; Monsoon; Stratosphere; Troposphere; Atlantic; Pacific; Impact; Waves; SST
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
Sciences > Physics > Atmospheric physics
ID Code:24422
Deposited On:31 Jan 2014 13:34
Last Modified:10 Dec 2018 15:05

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