利用紫外Mie散射激光雷达探测澳门地区沙尘暴事件

Ultraviolet Mie Lidar Observations of Aerosol Extinction in a Dust Storm Case over Macao

研制了一台工作波长为355nm的紫外高能Mie散射激光雷达,并利用该激光雷达在2010年一次沙尘暴事件期间对澳门上空的大气进行了探测,得到了澳门地区不同时刻的气溶胶消光系数垂直廓线。利用Fernald方法反演得到的气溶胶近地面消光系数随时间的变化与当地气象数据具有较好的一致性,气溶胶消光系数与当地可吸入颗粒物浓度的相关性达到了0.93。气溶胶垂直廓线显示,在沙尘暴来临期间存在明显的沙尘气溶胶凝集层。通过气溶胶轨迹倒推,分析了沙尘气溶胶的来源及路径。观测结果表明,该激光雷达可以在特殊天气条件下对澳门地区气溶胶进行有效探测,这将有助于深化对澳门上空气溶胶特性的研究。

Atmospheric aerosol over Macao was monitored by using a 355 nm Mie scattering lidar during the dust event on March 22nd,2010.Vertical profiles of aerosol extinction coefficients were obtained and correlated with local PM10 concentration.The near-surface aerosol extinction coefficients have good agreement with PM10 concentration values.The aerosol extinction vertical profiles showed that there were distinct layers of dust aerosol concentration.The source and tracks of dust aerosol were analyzed by back-trajectory simulation.Observations showed that this lidar could run well even in dust storm episode,and it would help to further the study on aerosol properties over Macao.