Intermittent Turbulence and Temperature Burst in the Nocturnal Surface Layer
夜间近地面稳定边界层湍流间歇与增温

During clear nights,the turbulence in the surface layer shows the characteristics of intermittence.The intermittent turbulence results in sharp temperature decreases and subsequent increases. The quick increase of temperature represents that there is large divergence of the turbulent heat flux in the near surface layer and heat flux should not be considered as a constant in this situation. After analysing the variances of temperature and velocity at different levels, it is found that the turbulence is usually stimulated at higher levels and then transported to the atmosphere below even though the trigger factor might come from lower levels. Sometimes it is stimulated at lower levels and then transported to the upper atmosphere. The characteristics presents that the atmosphere is usually not in an equilibrium and care should be taken when we study the nocturnal boundary layer with the similarity theory.