Interdecadal change of atmospheric stationary waves and North China drought
Dai Xin-Gang (戴新刚)ab, Fu Cong-Bin (符淙斌)a, Wang Ping (汪萍)a
a Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; b College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
Abstract The inderdecadal change of atmospheric stationary waves (ATW) has been investigated for the two periods 1956--77 and 1978--99. The trough of ATW in the middle and low layer of the troposphere over the Asian continent has experienced a significant weakening during the past two decades, which exerts a great influence on the North China climate. The ATW in 200 hPa has also exhibited some changes since 1977, as a stationary ridge appeared over the northwestern China while a stationary trough appeared above North China. This leads to an increasing of the upward motion above northwestern China and a decreasing above North China. A west--east section of the stationary waves at 40$^\circ$N shows that the ATW above North China tilted westward for the period 1956--77, but was almost upright during 1978--99. The composite analysis confirms that the climate mean ATW pattern after 1977 is similar to the dry pattern for North China, while the rainy pattern is similar to that before 1977. In consequence, the North China drought is partly due to the interdecadal change of the ATW over boreal Asia in the recent two decades.
Received: 21 October 2004
Revised: 26 November 2004
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 49875024) and China Postdoctoral Science Foundation (No 2004035074) and K. C. Wong Education Foundation, Hong Kong.
Cite this article:
Dai Xin-Gang (戴新刚), Fu Cong-Bin (符淙斌), Wang Ping (汪萍) Interdecadal change of atmospheric stationary waves and North China drought 2005 Chinese Physics 14 850
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