光子学报, 2018, 47 (3): 0301001, 网络出版: 2018-02-01
CCD激光雷达探测白天近地面气溶胶消光系数
Measurement of Extinction Coefficient of Near-surface Aerosol by CCD Lidar in the Daytime
大气光学 气溶胶探测 CCD激光雷达 白天探测 消光系数 Atmospheric optics Aerosol detection CCD lidar Daytime detection Extinction Coefficient
摘要
利用CCD激光雷达系统对合肥西郊近地面气溶胶消光系数进行了昼夜连续测量, 弥补了传统后向散射激光雷达近地面盲区和重叠区域的数据空白.比较夜间Mie散射气溶胶激光雷达和CCD激光雷达获得的气溶胶消光系数, 验证了CCD激光雷达系统的可靠性.CCD激光雷达系统的白天检测是可行的, 并获得了10~180 m高度的大气气溶胶消光系数, 空间分辨率最高可达1 cm.两种气溶胶消光系数分布表明, 气溶胶消光系数在垂直方向上不是单调递减, 且在一天中剧烈变化.CCD激光雷达检测到的气溶胶消光系数的时空演化图表明, 随着天色变黑, 整体气溶胶具有降低的趋势.CCD激光雷达的气溶胶消光系数曲线的日间检测是可以实现的.
Abstract
Atmospheric aerosol extinction coefficient vertical profiles of near-surface in Hefei western suburb were measured by a CCD lidar system in the day and night, which could fill the gap of the traditional Mie-scattering lidar system especially in the blind area and overlapped region. By comparison of the aerosol extinction coefficient retrieved by Mie-scattering aerosol lidar and CCD lidar at night, the reliability of the CCD lidar system was verified, and the daytime detection of the CCD lidar system was feasible. Profiles of atmospheric aerosol extinction coefficient for 10-180 m altitude were obtained with high spatial resolution, of which the highest resolution was up to 1 cm. Two cases of aerosol extinction coefficient profiles showed that the aerosol extinction coefficient was not monotone decreasing in vertical direction, at the same time, changed violently in the day. The spatio-temporal evolution of aerosol extinction coefficient retrieved by CCD lidar showed that the overall aerosol had a tendency to reduce as the day getting dark. The daytime detection of aerosol extinction coefficient profile by using CCD lidar is credible and fulfilled.
孙培育, 苑克娥, 杨杰, 胡顺星. CCD激光雷达探测白天近地面气溶胶消光系数[J]. 光子学报, 2018, 47(3): 0301001. SUN Pei-yu, YUAN Ke-e, YANG Jie, HU Shun-xing. Measurement of Extinction Coefficient of Near-surface Aerosol by CCD Lidar in the Daytime[J]. ACTA PHOTONICA SINICA, 2018, 47(3): 0301001.