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Effect of the climate shift around mid 1970s on the relationship between wintertime Ural blocking circulation and East Asian climate
Author(s) -
Wang Lin,
Chen Wen,
Zhou Wen,
Chan Johnny C. L.,
Barriopedro David,
Huang Ronghui
Publication year - 2010
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.1876
Subject(s) - climatology , east asia , blocking (statistics) , polar vortex , troposphere , stratosphere , environmental science , climate change , boreal , atmospheric sciences , atmospheric circulation , geography , geology , oceanography , statistics , mathematics , archaeology , china
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. Copyright © 2009 Royal Meteorological Society