ON SOME FUNDAMENTAL PROBLEMS OF DYNAMICS OF SMALL SCALE PROCESSES IN THE ATMOSPHERE

In the present paper,the properties of the solutions of the linearized equations of the small scale processes are analysed by the frequency method.It is indicated that there are two basic types of dynamical processes which correspond to those of the sound and the gravitational waves.In general,the rapid sound wave does not correspond to the meteorologically significant phenomena and.the existance of that wave will distort the actual changes connected with the meteorologically significant motion.Therefore,it is necessaiy to filter the sound wave from the equations of small scale motion.It is indicated that the static departure(static unequilibrium) is important for the development of small scale processes,such as the convection,so that it is not permitted to use the static approximation to filter the internal sound Wave.In this paper,for filtering the sound wave tliree methods are introduced,namely,1) applicationof imcompressiblibity;2) the solution in power series of the small parameter's,the Froude number,and 3) application of the balance equation for the small scale process.The error introduced by each of these methods is also analysed.