Research on Relations between Atmospheric Mixing Layer Heights and Fine Particle Concentrations with Lidar Measurements

• Published in: Beijing da xue xue bao Vol. 58; no. 3; pp. 412 - 420
• Main Authors: Sang, Yueyang, Chu, Yiqi, Liu, Zhe, Ren, Jingjing, Tian, Xiaoqing, Wang, Qixi, Li, Chengcai
• Format: Journal Article
• Language: Chinese
• Published: Beijing Acta Scientiarum Naturalium Universitatis Pekinenis 01.01.2022
• Subjects: Diurnal variations; Lidar; Weather; Wind
• ISSN: 0479-8023
• DOI: 10.13209/j.0479-8023.2022.022

Based on the observations of a micro-pulse lidar in Beijing, the MLH is retrieved by using the artificial assistance algorithm during the day from 2016 to 2019. Then the seasonal and diurnal variations of MLH and its relationship with PM2.5 mass concentration are analyzed. The results show that the MLH shows obvious seasonal and diurnal changes, and the daily averaged MLH is significantly higher in spring than that in other seasons. The daily maximum MLH height in every year occurs in May of the year. The variation trend of the MLH is opposite to the concentration of PM2.5 from 08:00 am to 03:00 pm. Through linear fitting of the data, it is shown that the negative correlation is stronger when the ventilation index and wind speed are induced. When considering the influence of wind direction, the MLH has a stronger negative correlation with PM2.5 in the case of southwesterly wind. In addition, after weather classification, the correlation between PM2.5 and the MLH in each same weather group can be significantly