基于激光雷达探测的金华、合肥和兰州大气边界层高度及其统计分析

Statistics and Analysis of Planetary Boundary Layer Height Retrieved by Lidar over Jinhua,Hefei and Lanzhou

利用三个站点(金华、合肥和兰州)同时期的观测数据对边界层高度进行了反演、统计和分析。研究结果表明,三个站点的边界层高度具有明显的季节、日变化特征。除冬季外,金华和合肥的边界层高度要低于兰州。兰州的边界层高度的上升和下降时间与日出、日落时间有着良好的对应关系,合肥的边界层高度则在日出数小时后才出现明显上升。金华、合肥和兰州日间月平均边界层高度最高值分别出现在9月、8月和6月,月平均最大混合层高度出现的月份分别是9月、8月和7月。了解边界层高度的时空分布规律,可以为空气污染防治、天气预报以及气候预测等提供进一步的参考。

This paper utilizes the observed data at three sites,namely Jinhua,Hefei,and Lanzhou sites,for the same period to carry out planetary boundary layer height(PBLH) inversion,statistics,and analysis.The research results show that the PBLHs over Jinhua,Hefei,and Lanzhou have characteristics of seasonal and diurnal variation.The PBLHs over Jinhua and Hefei are lower than that over Lanzhou in spring,summer,and autumn.The starting time of the rise and fall of boundary layer height over Lanzhou is in well correspondence with the time of sunrise and sunset,whereas the height over Hefei does not increase significantly until a few hours after sunrise.Jinhua,Hefei and Lanzhou have the highest monthly mean diurnal PBLHs in September,August,and June,respectively,and the corresponding monthly mean maximum mixed layer heights are in September,August,and July,respectively.Studying the spatial and temporal distribution pattern of the PBLH can provide further reference for research of air pollution prevention and control,weather forecasting,and climate prediction.