利用激光雷达太阳光度计等多种遥感手段立体监测一次沙尘事件

Stereo Monitoring of a Dust Case Using Lidar and Sunphotometer

利用位于北京以及河北香河的两台地基Mie散射激光雷达、星载激光雷达、太阳光度计以及颗粒物监测仪等一系列仪器对发生在2008年5月底的一次沙尘事件进行立体监测并分析。结果表明,这起较严重的沙尘是由蒙古国输送而来,影响范围很广,持续时间较长,有三次明显的峰值,对应三次沙尘的来袭;沙尘的每次来袭都对应有先升温后降温的现象,并伴随有相对湿度的急剧下降;沙尘入侵前北京香河两地以细粒子为主,入侵后代之以粗粒子为主。

A dust case over North China（May 2008） was monitored and studied by a synergy of ground-based lidar（located in Beijing and Xianghe site）,satellite lidar,sunphotometer and particle monitoring instrument.The result show that,（a） the heavy dust transported from Mongolia impacts a large area in North China and lasts for a long time,（b） there are three peak aerosol loadings during this period,and the temperature rising up and dropping down again as well as rapid decrease of relative humidity were observed response to each peak,（c） the predominant aerosol is fine/coarse aerosol before/after dust intrusion in Beijing and Xianghe.