Based on diagnostic results,a numerical study is made of the processes of Australian cold air activityaffecting East Asian summer monsoon by using Kuo-Qian P-σ incorporated coordinate five-layer primitiveequation spherical band model.Analysis is done of the response to the Southern Hemisphere circulationwith and without cold air activity in Australia of the flow,rainfall and diabatic heating fields in the monsoonarea of Asia,especially,East Asia,with special attention to the intensification and northward march of themonsoon due to the activity.It is found that the processes for the effect transmission are very analogous tothe meridional propagation of quasi-40-day oscillation,together with the meridional wind disturbance showingsouth-north travel and the flow/rainfall fields exhibitirg corresponding movement in this direction,only witha 12-day lag.
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