北京地区大气混合层的探测与预测模式的检验

THE OBSERVING RESULTS OF ATMOSPHERIC MIXED LAYER IN BEIJING DISTRICT AND THE ASSESSMENT OF THEORETICAL MODELS

本文使用1986年7月和12月北京地区低空探空和湍流感热通量的实测资料,并对照室内水槽模拟实验的结果,对于大气混合层的零阶和一阶预测模式进行了检验。文中着重探讨了混合层顶卷夹层的卷夹系数与混合层发展之间的关系。

Using the data of observed temperature and wind profile, and surface sensible heat flux in July and December 1986 in Beijing District, comparing with the results from water tank simulation experiment, the theoretical models for predicting the development of convective mixed-layer are assessed. It isobtained that the entrainment coefficient used in zero order jump model (slab model) are 0.15 and 0.10 in Summer and Winter, respectively, and 0.20 for the laboratory experiment. With regards to the first-order jump model the entrainment coefficient becomes stable with the value between 0.15 - 0.19 except in the initial convective developing stage of the mix-layer.