Abstract

We studied the specific features of aerosol microstructure in the near-surface layer and in the vertical column of the atmosphere after smoke from fires enters the atmosphere. The aerosol microstructure parameters were determined by solving the inverse problem for spectral measurements of the aerosol extinction coefficient by the path method and aerosol optical depth by the sun photometry method in a clean atmosphere and during its pollution by smoke near Tomsk. The geometric cross section, volume concentration, and mean radius of submicron and coarse aerosol particles were calculated. The coarse fraction is typically predominant in the total volume of aerosol under the background conditions. The submicron fraction of aerosol particles becomes dominant after air is polluted by smoke. As a result, the particle radius averaged over the total ensemble decreases in the smoke-polluted atmosphere. Also, the character of regression interrelations between the microstructure parameters of different aerosol fractions and the spectral characteristics of aerosol extinction significantly change after the atmosphere is polluted by smoke.

中文翻译：

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根据近地表层和垂直大气柱中光谱消光特性的反演，森林火灾烟雾影响下气溶胶微观结构的变化

摘要

我们研究了大火烟雾进入大气后，近表层和大气垂直柱中气溶胶微观结构的具体特征。通过在清洁的大气中以及在托木斯克附近被烟污染的过程中，通过路径法解决气溶胶消光系数的光谱测量问题以及通过太阳光度法解决气溶胶光学深度的光谱问题，从而解决了气溶胶微结构参数的问题。计算了亚微米颗粒和粗颗粒颗粒的几何横截面，体积浓度以及平均半径。在背景条件下，粗颗粒通常占气雾剂总体积的主要部分。空气被烟雾污染后，气溶胶颗粒的亚微米级成分占主导地位。结果是，在烟尘污染的大气中，整个集合的平均粒子半径减小。此外，在大气被烟雾污染后，不同气溶胶组分的微观结构参数与气溶胶消光光谱特征之间的回归相关性特征也发生了显着变化。