A NUMERICAL EXPERIMENT OF DYNAMIC EFFECT OF QINGHAI-XIZANG PLATEAU ON SUMMER ATMOSPHERIC LOW FREQUENCY VARIATION

In this paper a numerical experiment is presented of the plateau's dynamic effect in terms of a two-layer spectral model, and the focus is put on the large-scale orography-excited ALFV with the summer flow pattern as background.together with its propagation and distribution of some features. The main results are as follows: (1) With the summer flow pattern as background the Plateau can excite ALFV, which is characterized by strong regionality. (2) ALFV of this kind has a baroclinic (equivalent barotropic) structure on the south (north) side of the topography. (3) Its propagation is marked by dispersion of quasi-stationary Rossby waves over a spherical surface.