A NUMERICAL SIMULATION OF D1URNA1 VARIATIONS OF METEOROLOGICAL FIELDS IN SUMMER

The influences of the Tibetan Plateau and the Rocky Mountains on diurnal variations of the meteorological fields in July are investigated by use of a five-layer global atmospheric general circulation model which includes various physical processes, including diurnal variation of solar radiation and real topography. In this paper, a brief description of the model is given first and then we emphatically discuss the results by comparatively analysing the influences of the Tibetan Plateau and the Rocky Mountains on diurnal changes of temperature, the geopotential height, the horizontal and the vertical flows, as well as the vertical circulations in summer. The comparative analyses show that there are very prominent diurnal variations of temperature, geopotential height, wind fields and vertical circulations in the mountainous regions, the amplitudes of their variations are proportional to the scales of topography.