利用激光雷达资料分析兰州远郊气溶胶光学特性  

Analyses on Atmospheric Aerosol Optical Properties with Lidar Data in Lanzhou Suburb

作　　者：周碧[1] 张镭[1] 曹贤洁[1] 韩霄[1] 张武[1] 冯广泓[1] 

机构地区：[1]半干旱气候变化教育部重点实验室/兰州大学大气科学学院,甘肃兰州730000

出　　处：《高原气象》2011年第4期1011-1017,共7页Plateau Meteorology

基　　金：国家自然科学基金项目(41075104);国家重点基础研究发展规划项目(2010CB428604)共同资助

摘　　要：利用2007年1～4月兰州大学半干旱气候与环境观测站激光雷达资料,反演了晴空无云典型日和沙尘过程大气气溶胶消光系数和光学厚度。结果表明,兰州远郊榆中地区,1km以下大气气溶胶消光系数较大,为0.01～0.1km-1;平均气溶胶光学厚度<0.5,光学厚度日变化呈双峰型,峰值分别出现在12:00和20:00。采暖期与非采暖期气溶胶光学厚度有显著差异。而对沙尘天气,6km以下气溶胶消光系数较大,为0.1～1km-1;气溶胶光学厚度>1,最强时可达3.5;沙尘强度较大时,激光雷达对气溶胶有效观测<2km,消光系数反演出现截断现象;沙尘气溶胶光学厚度与PM10地面浓度有良好的相关性;激光雷达反演的光学厚度与太阳光度计光学厚度的相关系数为0.86。Based on the lidar from the Semi-Arid Climate and Environment Observatory of Lanzhou University（SACOL）,the data from January to April 2007 with clear sky and dust storm weather were selected to retrieve aerosol extinction coefficient（AEC） and aerosol optical depth（AOD）.The results show that the AEC has high value in the low layer under 1 km,which is 0.01～0.1 km-1;the average AOD is below 0.5,the daily AOD has two peaks appearing at 12：00 and 20：00,respectively.The difference between heating and non-heating season is obvious.In dust storm,The AEC has high value under 6 km,with 0.1～1 km-1;the AOD is larger than 1;the peak value is 3.5;the lidar valid observation has below 2 km with the retrieve of AEC showing segments phenomena in strong dust storm process,and the AOD has good relation with PM10 surface concentration.The AOD correlation coefficient between lidar and sun photometer is 0.86.

关 键 词：兰州远郊 激光雷达 太阳光度计 气溶胶 消光系数 光学厚度 

分 类 号：P402[天文地球—大气物理学与大气环境]