激光雷达监测北京城区夏季边界层气溶胶

运用一种新型边界层气溶胶监测激光雷达,在北京丰台区进行了外场实验,探讨了大气边界层(PBL)内气溶胶消光系数与湿度、风速等气象条件的关系,并给出了消光系数的时空分布。实验结果表明,水平大气气溶胶消光系数与黑碳质量浓度、地面风速等近地气象因子均有较好的相关性;边界层气象因子直接影响气溶胶的时空扩散和分布;在近地面风速较小等条件下,北京城区气溶胶污染在凌晨和上午较下午和前半夜严重。

Urban Planetary Boundary Layer Aerosol Monitoring by Lidar at Beijing

Beijing outfield experiments have been conducted with a new planetary boundary layer(PBL) aerosol monitoring lidar in the summer.The relations of black carbon mass concentration and near ground wind speed to aerosol extinction coefficient are analyzed,and the space-time distributions of aerosol extinction coefficient are also presented in this paper.The results indicate that: the correlations of black carbon mass concentration and near ground wind speed to aerosol extinction coefficient are good;the near ground weather conditions can affect the space-time diffusion and distribution of aerosol;the aerosol pollution during wee hours and morning is serious than in the afternoon and late at night.The results can be referenced for environment management.