RT Journal Article T1 Effect of the climate shift around mid 1970s on the relationship between wintertime Ural blocking circulationand East Asian climate A1 Wang, Lin A1 Chen, Wen A1 Zhou, Wen A1 Chan, Johnny C. L. A1 Barriopedro Cepero, David A1 Huang, Ronghui AB 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. PB John WiIley & Sons LTD SN 0899-8418 YR 2010 FD 2010-01 LK https://hdl.handle.net/20.500.14352/44122 UL https://hdl.handle.net/20.500.14352/44122 LA eng NO © 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). NO National Natural Science Foundation of China NO City University of Hong Kong DS Docta Complutense RD 4 abr 2025