低层大气紫外DIAL遥感中粒子和分子消光效应的研究
Investigation of particle and molecular extinction effects in remote sensing by ultraviolet DIAL in the lower atmosphere
摘要：
本文通过忽略大气气溶胶的空间不均匀性和考虑折射对大气温度和气压的依赖性，对几种紫外波段的紫外可见光在近地面水平遥感中的粒子和分子消光效应进行了理论研究。由于该地区氧气等气态大气成分的衰减较弱，在计算中只考虑了臭氧的影响。结果对估算UV-DIAL中大波长间隔引起的气体浓度测量系统误差有重要意义，并以表格的形式列出了200 ~ 400 nm波长范围内几种波长的总衰减（km ~（-1））。结果表明，在紫外波段，气溶胶的衰减随波长的变化非常平稳，因此，即使在较大的波长间隔下，气溶胶散射引起的系统误差也可以忽略。在低层大气紫外波段激光雷达遥感中，只有气溶胶消光效应占主导地位。在大高度，气溶胶浓度较低;分子散射是重要的，特别是波长大于310纳米。
英文摘要：
This study presents theoretical investigation of the effects of particle and molecular extinction in horizontal remote sensing near the ground for several visibilities at UV wavelengths by neglecting the spatial inhomogeneity of aerosol in the atmosphere and taking into account the dependence of refracting on air temperature and pressure. Due to weak attenuation of oxygen and other gaseous atmospheric constituents in this region, we have only considered the effect of ozone in calculation. The results are important to estimate systematic errors in measuring gas concentration introduced by large wavelength separation in UV-DIAL. The total attenuation (km-1) at wavelengths is listed in the form of a table from 200 to 400 nm for several values of visibilities. It is found the aerosol attenuation in UV region varies quite smoothly with wavelength and therefore systematic error caused by aerosol scattering is negligible in remote sensing by UV-DIAL even with large wavelength separation. Moreover, it has been found that only aerosol extinction is dominant in lidar remote sensing in the lower atmosphere in UV region. In large altitude that aerosol concentration is lower; the molecular scattering is important especially for wavelengths larger than 310 nm.
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