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.
Key words Asian monsoon circulation - Weakening - Transition
This research was supported by the key project of Chinese Academy of Sciences under Contract KZCX2-203 and the key program of the National Natural Science Foundation of China under Contract 49894170.
Advances in Atmospheric Sciences
This research was supported by the key project of Chinese Academy of Sciences under Contract，the key program of the National Natural Science Foundation of China under Contract
Asian monsoon circulation