基于转动拉曼-米激光雷达拟合大气边界层内气溶胶光学厚度与PM_(2.5)

Fitting Aerosol Optical Depth and PM_(2.5) in Atmospheric Boundary Layer by Using a Rotational Raman-Mie Lidar

提出一种利用转动拉曼-米散射激光雷达米弹性散射信号与转动拉曼散射信号比值来拟合大气边界层1km以内气溶胶光学厚度与PM2.5值的方法.该方法消除了几何因子对近地面探测过渡区所带来的误差,而且消除了近地面大气湿度的影响,能够获得高精度的气溶胶后向散射系数,并在此基础上推导了气溶胶光学厚度(AOD)的计算方法,最后利用实验室转动拉曼-米激光雷达系统测量的2013年北京地区气溶胶数据,拟合获得了2013年北京地区冬夏两季AOD-PM2.5经验公式.

A method was presented for fitting aerosol optical depth and PM2. 5 within 1 km of atmospheric boundary layer by using the ratio of Mie elastic scattering signal and Raman scattering signal of the rotational Raman-Mie lidar. It can eliminate the error brought by the geometric form factor and effects of atmospheric humidity and can obtain a high accuracy of aerosol scattering coefficients. And then an arithmetic was derived for the aerosol optical depth （AOD）. Finally, the aerosol data that measured by the rotational Raman-Mie lidar system in laboratory for Beijing area in 2013, were used to get the experience formulas of AOD-PM2.5 for winter and summer in 2013 Beijing area.