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In this paper the Lorenz’s moist low-order spectral model~([1]) is further improved by introducinga parameterization for cumulus convection into it. Numerical experiments by this improved model mani-fest quasi-three week oscillations both in the location of the simulated subtropical high at upper tropo-sphere along cast-west direction and in the simulated vertical velocities and precipitation over South Asia,which is similar to those in the real atmosphere. The results of the experiments and the computationsof parameters of energetics show that introducing moist processes is a necessary condition for stimulat-ing and maintaining the low-frequency oscillations, and that moist convection can also obviously shortenoscillation periods, which is generally in agreement with the conclusions in another paper~([2]) of theauthors.
In this paper the Lorenz’s moist low-order spectral model ~ ([1]) is further improved by introducinga parameterization for cumulus convection into it. Numerical experiments by this improved model mani-fest quasi-three week oscillations both in the location of the simulated subtropical high at upper tropo-sphere along cast-west direction and in the simulated vertical velocities and precipitation over South Asia, which are similar to those in the real atmosphere. The results of the experiments and the computations of parameters of energetics show that introducing humidity processes is a necessary condition for stimulat-ing and maintaining the low-frequency oscillations, and that moist convection can also obviously shortenoscillation periods, which is generally in agreement with the conclusions in another paper ~ ([2]) of theauthors.