Study of boundary height layer evolution patterns in different climate zones based on LIDAR observations

The planetary boundary layer (PBL) is crucial for environmental pollution and climate change. LIDAR, with its high spatiotemporal resolution, has a strong advantage in automatically and continuously acquiring the planetary boundary layer height (PBLH). In this study, LIDAR was used in simultaneous observations of three stations in different climatic zones, Jinhua, Hefei and Lanzhou, to establish a multi-site boundary layer height inversion method, which was used to invert, statistically and analytically analyze the planetary boundary layer height. The results show that the planetary boundary layer heights over Jinhua, Hefei, and Lanzhou are characterized by different seasonal and diurnal variations. The planetary boundary layer heights over Jinhua and Hefei are lower than those over Lanzhou in spring, summer and fall. The time when the boundary layer height over Lanzhou starts to increase and decrease coincides well with the time of sunrise and sunset, while the boundary layer height over Hefei does not increase significantly until several hours after sunrise. The monthly mean diurnal mixed layer heights over Jinhua, Hefei and Lanzhou are highest in September, August and June, respectively, and the corresponding monthly mean maximum mixed layer heights are in September, August and July, respectively. The study demonstrates that the spatial and temporal distribution pattern of PBLH reflects the local climate characteristics, which can provide important data for air pollution control, weather forecasting and climate prediction.