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。

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.