基于DOAS技术的气溶胶粒谱分布反演方法研究

Determination of the Retrieval Arithmetic of Aerosol Size Distribution Measured by DOAS

大气气溶胶不仅对全球的气候变化产生重大影响,其本身也是一种污染物,另外它在许多污染气体的化学反应中起重要作用。因此,实时监测大气气溶胶已成为环境领域的重要研究方向。差分吸收光谱技术是一种基于痕量气体"指纹"特性反演其浓度的光学遥感方法,同时该方法也可用于大气气溶胶消光系数的测量。文章介绍了利用闪烁差分吸收光谱系统监测大气气溶胶粒谱分布的方法,重点阐述了基于蒙特卡罗方法的粒谱分布反演算法,监测结果通过与PM10、能见度及Angstrom波长指数的对比证实了该方法的可行性,为近地面大气气溶胶监测提供了新的手段,同时也扩展了差分吸收光谱技术的应用范围,该方法对大气化学的研究有着重要的意义。

Atmospheric aerosol is not only an important factor for the change in global climate, but also a polluting matter. Moreover, aerosol plays a main role in chemical reaction of polluting gases. Determination of aerosol has become an important research in the study of atmospheric environment. Differential optical absorption spectroscopy （DOAS） is a very useful technique that allows quantitative measurement of atmospheric trace gas concentrations based on their fingerprint absorption. It also can be used to retrieve aerosol extinction coefficient. In the present work, the method of determination of aerosol size distribution measured by flash DOAS is described, and the arithmetic based on Monte-Carlo is the emphasis. By comparison with the concentration of PM10, visibility and Angstrom wavelength exponent, a good correlation can be found. Application of DOAS in aerosol field not only provides a novel method for aerosol detection, but also extends the field of application of DOAS teehnology. Especially, aerosol DOAS plays an important role in the study of atmospheric chemistry.