The aerosol optical depth of the atmosphere obtained from spectral sun photometer measurements and the integral optical depth determined from standard actinometric observations of direct solar radiation are the parameters of the optical state of the atmosphere. The quantitative estimates of the integral transparency and aerosol optical depth of the atmosphere in Antarctica are presented, their long-term variability over the entire period of observations is analyzed. The comparison of obtained data with the estimates for other natural regions and conditions revealed that during the periods without the impact of volcanic eruptions, the levels of atmospheric aerosol turbidity in Antarctica over the recent decades are minimal on the planet and can be considered as global background characteristics.

中文翻译：

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南极米尔尼天文台大气整体和光谱透明度的长期变异性

从光谱太阳光度计测量获得的大气气溶胶光学深度和从直接太阳辐射的标准光度法观测确定的积分光学深度是大气光学状态的参数。给出了南极大气整体透明度和气溶胶光学深度的定量估计，并分析了它们在整个观测期间的长期变化。将获得的数据与其他自然区域和条件的估计值进行比较后发现，在不受火山喷发影响的时期内，南极洲近几十年来的大气气溶胶浊度水平极低，可以视为全球背景。特征。