基于激光雷达的京津冀地区大气边界层高度特征研究

Characteristics of Boundary Layer Height in Jing-Jin-Ji Area Based on Lidar

大气边界层高度对大气颗粒物污染具有重要的影响。为研究京津冀区域的大气边界层高度变化特征,利用该地区多个站点的激光雷达数据,进行了统计研究,并将激光雷达观测值与美国国家气象局国家环境预报中心全球资料同化系统模式模拟结果进行了对比。观测数据表明,京津冀地区的大气边界层具有明显的日变化特征和季节变化特征:白天的大气边界层高度高于夜晚,且边界层高值出现在14:00左右;夏、冬季的大气边界层高度高于春、冬季;冬季大气边界层高度有降低趋势。此外,2014年11月多个站点由激光雷达测得的边界层高度的统计分析表明,京津冀地区大气边界层高度在300~900m之间,且东南方向较高。

The atmospheric boundary layer height has important influence on particulate air pollution. A statistical investigation of atmospheric boundary layer height based on a large amount of Lidar data from multiple sites is used to analysis the characteristic in the Jing-Jin-Ji area. The atmospheric boundary layer height retrieved from the Lidar data is compared with the national weather service national centers for environmental prediction global data assimilation system forecast model result. Statistical results show that the atmospheric boundary layer of the Jing- Jin-Ji area has obvious characteristics of diurnal and seasonal variations, and the atmospheric boundary layer height is higher in the daytime than at night, and the peak value of the atmospheric boundary layer height occurs at 14：00. The atmospheric boundary layer height during the summer and autumn is higher than spring and winter, the atmospheric boundary layer height in winter also has a decreasing tendency. In addition, the statistical result of November 2014 based on all Lidar sites of atmospheric boundary layer height shows that the boundary layer height of the Jing-Jin-Ji area is between 300~900 m and higher in the southeast.