The Oscillation Characteristics of Radiational Parameters over the Zhangye Region During the Summer of 1984

A multi–spectral method is used to study medium-short and very-short range oscillation characteristics of radiation parameters observed in the Zhangye region of China in the summer of 1984. Medium-short range oscillation are defined as a sort of the variation occurring on the time scale of 3—5 days: the very-short range oscillations occur over the periods of approximately 30—80 minutes. The quasi-three days oscillation is also found in the thermal boundary layer. These oscillations propagate from west to east within the height range of about 400 hPa. The amplitudes of the very-short range oscillations of the radiation parameters over the Zhangye region vary with a period of 3—5 days, However, there are certain relationships among all sorts of the scales of the oscillations in the atmosphere. The quasi-three day oscillation may be a response to the thermal disturbance on the Qinghai–Xizang Plateau. There seems no distinct relationship between the very-short range oscillation and synoptic systems, but the oscillations appear to vary with the thermal state near the surface and prevalent cloud type