利用偏振测量和阴影隐藏确定大气气溶胶的特征

E. Zubko, M. Zheltobryukhov, E. Chornaya, Konstantin A. Shmirko, Vladimir V. Lisitsa, Andrey N. Pavlov, A. Kochergin, Gennady Kornienko, G. Videen
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引用次数: 0

摘要

非偏振太阳光会被获得部分线性偏振的气溶胶散射。通过垂直向上瞄准地面探测器,可以记录太阳照射下的气溶胶的偏振响应。当太阳落山时,天空的一部分会被遮挡,这时就可以测量未被遮挡区域气溶胶的偏振响应。这为随时间扫描大气柱的不同部分提供了一种方法。通过将测量到的极坐标响应与模型团聚碎片颗粒的极坐标响应进行比较,我们可以对大气柱不同部分的气溶胶的大小和化学成分进行限制。我们在 2021 年 4 月至 2022 年 12 月的 24 个不同时间段内进行了一次调查,其中包括在乌苏里斯克天体物理观测站对黄昏时分的大气偏振进行的约 600 次测量。我们发现,大多数测量结果都与水冰颗粒或尘埃相对应。不过,在某些情况下,有机碳在测量结果中占主导地位。这些时间段与该地区火场增加的时间相吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterizing atmospheric aerosols using polarimetry and shadow hiding
Unpolarized sunlight is scattered by aerosols acquiring partial linear polarization. By aiming a ground-based detector vertically upward, it can record the polarimetric response of aerosols that are illuminated by the Sun. As the Sun sets, a portion of the sky is shadowed and the polarimetric response of the aerosols in the unshadowed region can be measured. This provides a means of scanning different portions of the atmospheric column with time. By comparing the measured polarimetric response with that of model agglomerated debris particles we can place constraints on the sizes and chemical composition of the aerosols in different portions of this column. We conducted a survey over 24 different epochs from April 2021 to December 2022, consisting of approximately 600 measurements of polarization of the atmosphere in twilight at the Ussuriysk Astrophysical Observatory. We found that most of the measurements correspond with water-ice particles or dust. However, on some occasions organic carbon dominated the measurements. These epochs correspond with increased fire seats in the region.
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