激光雷达斜程探测的对流层气溶胶空间分布

Spatial distribution of aerosol in troposphere measured by lidar at slant range

介绍了一台以直接探测方式工作的用于大气气溶胶测量的小型Mie散射激光雷达系统。利用该系统对苏州城区上空的大气气溶胶进行了连续的斜程探测,并通过相应的数据处理方法,得到了气溶胶消光系数分布随时间的演变图。探测结果表明:在对流活动比较复杂的12km以下高度范围内,气溶胶的消光系数分布极不稳定,不同日期乃至不同时刻都发生很大的变化。同是晴朗天气,气溶胶消光系数分布相差1个数量级左右。这些结果不仅全面直观地反映了大气空间气溶胶消光系数的垂直分布情况,而且清楚地显示了这一分布随时间的整体变化趋势,对于实时的大气环境监测具有重要意义。

A Mie scattering lidar working with direct detection was introduced for measuring the atmospheric aerosols. The extinction coefficient of atmospheric aerosol at Suzhou was continuously measured, and some vertical distributions of aerosolxtinction coefficient and their time evolving figures were obtained by corresponding data processing means. Some classical measurement results were given. These results show that, the distribution of the aerosol extinction coefficient is extremely unstable below 12 km, at which the convective activity is more complex, showing great changes on different dates and even at different times of one day. Detection results confirm that, in the same sunny weather, the distribution of aerosol extinction coefficient differs about one order of magnitude. The results not only obviously reflect the distribution of aerosol′ extinction coefficient of some longitudinal cross section in atmosphere space, but also display the integral changing tendency of this distribution with time. And it will be significant for real-time monitoring of atmospheric environment in future.