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The Weakening of the Asian Monsoon Circulation after the End of 1970's

Wang Huijun Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029  
The transition of the global atmospheric circulation in the end of 1970/s can clearly be detected in the atmospheric temperature, wind velocity, and so on. Wavelet analysis reveals that the temporal scale of this change is larger than 20 years. Studies in this work indicate that the trend of the transition over the mid- latitude Asia is opposite to that of global average for some variables at the middle troposphere. Another finding of this research is that the African-Asian monsoon circulation is weaker and the trade wind over the tropical eastern Pacific is weaker as well after this transition. Such a signal may be found in the summer precipitation over China as well.
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