云覆盖对流边界层顶部湍流结构参数的研究

应用飞机探测资料分析研究云覆盖对流边界层顶部温度和湿度湍流结构，在考虑对流边界层顶部夹卷过程的基础上得到计算温度和湿度结构参数的公式。应用实际观测资料分析了云覆盖对流边界层顶部的湍流特征．资料分析表明，云外晴空区温度和湿度结构函数值明显高于云内的值．云顶边界清晰，通过界面温度和湿度具有明显的跃变特征．应用观测资料检验了温度和湿度结构参数计算公式，计算结果与观测结果符合较好．

STUDY OF TURBULENT STRUCTURE PARAMETERS AT TOP OF CLOUD COVERED CONVECTIVE BOUNDARY LAYER

The turbulent structure of the temperature and humidity at the top of cloud covered convective boundary layer was analyzed by using foe data of aircraft detection. Based on consideration of entrainment process at the top of convective boundary layer the formulas for calculating the temperature and humidity structure parameters were obtained. By using the observational data the turbulent properties at the top of cloud covered convective boundary layer were analyzed. The analyses results showed that the temperature and humidity structure function values in clear air outside of cloud were much higher than those in cloud. The boundary of cloud top was very distinct and there were clear jump properties of temperature and humidity through interface of cloud. The formulas for calculating temperature and humidity structure parameterswere checked with observational data. The calculahon results with formulas were consistent well with observational one.