激光雷达观测的武汉上空对流边界层高度与夹卷层厚度

基于地基偏振激光雷达2011年1月至2017年12月对武汉中心城区的观测资料，研究了超大城市对流边界层高度与夹卷层厚度的变化特征.采用Fernald方法进行数据反演获得了1min时间分辨率、30m空间分辨率的后散比剖面，通过方差法确定了对流边界层高度和夹卷层厚度.结果表明，武汉上空对流边界层高度和夹卷层厚度具有明显的季节变化特征.对流边界层顶的均值最大处在春季为1.14km，夏季为1.25km，秋季为1.06km，冬季为0.74km；夹卷层厚度均值最大处在春季为0.40km，夏季为0.51km，秋季为0.34km，冬季为0.26km.这些特征与武汉地区地表温度的周年变化特征具有很强的相关性. 

Convective Boundary Layer and Entrainment Zone Thickness over Wuhan (30.5°N, 114.4°E) Observed by Lidar

Variations of the Convective Boundary Layer (CBL) height and Entrainment Zone Thickness (EZT) have been studied based on 532-nm polarization lidar measurements between January 2011 and December 2017 at Wuhan (30.5°N, 114.4°E), China. The 1-min backscatter ratio R profiles are retrieved using the backward iteration Fernald method. The hourly CBL height and EZT are determined with the variance method. The results indicate that the CBL height and the EZT over Wuhan have obvious seasonal variation. The average value of the maximum CBL height is 1.14, 1.25, 1.06, and 0.74 km in spring, summer, autumn and winter respectively, while the average EZT is 0.4, 0.51, 0.34, and 0.26 km in spring, summer, autumn and winter respectively. These characteristics have a clear-cut positive correlation with the land surface temperature in Wuhan.