上海城市对大气边界层若干影响的初步分析

The Impact of the City on some Features of Boundary Layer in Shanghai

本文根据上海城市气候特征与大气污染防治课题组提供的上海城、郊同步观测的小球测风、低空探空和平衡球等资料,对上海城郊近地层和边界层内的湍强、R_i数、摩擦速度、下垫面粗糙度、风速廓线以及扩散参数等进行计算,并且采用城郊对比法进行分析和探讨.结果表明,上海城市对边界层动力和热力特征影响甚大,城市这个人为因素对边界层的影响不容忽视.

By using the synchronous observed balanced and sounding balloon data in urban and rural area provided by Shanghai's urban climate and air pollution research group, the turbulence intensity, Richardson number, friction velocity and roughness coefficient of under lying surface, wind profile and air diffusion parameter are calculated.And by comparing the results in urban area with that in rural area, the impacts of the city on these features of boundary layer are analysed and discussed.The conclusion indicates that the impact of the city on the dynamic and thermal features of boundary layer is significant and cannot be ignored.