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

© 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).
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.
National Natural Science Foundation of China
City University of Hong Kong
Depto. de Física de la Tierra y Astrofísica
Fac. de Ciencias Físicas
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