OBSERVING RESULTS OF THE ATMOSPHERIC MIXED LAYER IN BEIJING AREA AND THE EVALUATION OF THEORETICAL MODELS

In the present study the data of wind and temperature profiles and sensible heat flux observed in Beijing in July and December of 1986,together with the results of water tank experiments for comparison,are used to test the prediction models of the atmospheric mixed layer with zero order and first order assumption,respectively.The results show that the entrainment rates in summer and winter used in the zero order model are 0.15 and 0.10,respectively,while its value in the first order model ranges between 0.15 and 0.19 with a lower rate at the initial stage of mixed layer development.Emphasis in the study is also placed on the relationship between the entrainmert rate and the development of the mixed layer.