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Analysis is performed of low-frequency oscillation (LFO) and its relation to monsoon by means of ECMWF nu-merical prediction data in the period 1 June to 30 September 1984,indicating that remarkable local LFO exists in thevertical meridional and equatorial zonal circulations.And preliminary discussion is made of the origin of the LFO of theEast-Asian summer monsoon meridional circulation in the LFO of the mid and upper troposphere vertical motionaround 30°S.The LFOs in the meridional circulations of both hemispheres are linked together by the LFO of themeridional circulation.Finally the possible relation between the tropical monsoon LFO and Meiyu (plum rain).
Analysis is performed on low-frequency oscillation (LFO) and its relation to monsoon by means of ECMWF nu-merge prediction data in the period 1 June to 30 September 1984, indicating that the remarkable local LFO exists in thevertical meridional and equatorial zonal circulations. And preliminary discussion is made of the origin of the LFO of the East-Asian summer monsoon meridional circulation in the LFO of the mid and upper troposphere vertical motion of 30 ° S. The LFOs in the meridional circulations of both hemispheres are linked together by the LFO of themeridional .Finally the possible relation between the tropical monsoon LFO and Meiyu (plum rain).