AN ANNULUS EXPERIMENTAL SIMULATION OF THE INFLUENCE OF THE CHINGHAI-TIBETAN PLATEAU ON THE WIND FIELD OVER ITS ADJACENT REGIONS IN WINTER

In this paper, the winter circulation over Tibetan Plateau and its adjacent regions is simulated in a rotating annulus. The main results are as follows: In winter, the formation and the intensity of the major trough over Eastern-Asia is not only related to the Continent-Ocean distribution and the dynamical role of the Plateau, but also to the thermodynamic effect of the Plateau which is also very important.The atmosphere over the plateau and its adjacent regions is a cold source in winter, The meridional vertical circulation to the south and north of the plateau is directly related to the cooling effect over the plateau.Besides, we find that a cooling modle plateau may give rise to minor troughs moving eastward on the southern branch current to the south of the plateau.By comparing the experimental results of a nonheating and noncooling model plateau,a cooling model plateau and a partly heating model plateau, some dynamic and the thermodynamic roles of the plateau are revealed.