The Effect of Oxygen on Organic Haze Properties
The Effect of Oxygen on Organic Haze Properties
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氧气对有机雾度特性的影响
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
M. Tolbert
中科院分区：
文献类型：
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作者：
M. Ugelow;D. Haan;S. Hörst;M. Tolbert
大气有机烟雾存在于许多行星体上，可能包括古老的地球和系外行星，并且可以极大地影响表面和大气特性。在这里，我们研究的物理和光学性质的有机烟雾产生的分子氮，甲烷，二氧化碳，和增加量的分子氧，并比较它们产生的烟雾没有添加氧气。随着分子氧以从0到200 ppmv的递增量被包括，所产生的雾度的质量负载非线性地降低。在200 ppmv分子氧的情况下，产生的颗粒的质量负载量与现代地球大气中的有机气溶胶的数量相当，这表明虽然不是厚厚的有机烟雾，但200 ppmv分子氧产生的烟雾颗粒仍然可以影响行星气候。此外，随着氧气量的增加而产生的雾变得越来越氧化，并且密度增加。对于用0、2和20 ppmv氧气产生的雾，密度分别为0.94、1.03和1.12 g cm-3。此外，用0，2，和20 ppmv的氧气产生的雾被发现有真实的折射率n = 1.58 ± 0.04，1.53 ± 0.03和1.67 ± 0.03，分别和虚折射率，0.002 ± 0.002和，分别。这些k值表明，在我们的实验误差范围内，用氧形成的颗粒没有吸收，并且在含氧气氛中可能导致光散射层。
Atmospheric organic hazes are present on many planetary bodies, possibly including the ancient Earth and exoplanets, and can greatly influence surface and atmospheric properties. Here we examine the physical and optical properties of organic hazes produced with molecular nitrogen, methane, carbon dioxide, and increasing amounts of molecular oxygen, and compare them to hazes produced without added oxygen. As molecular oxygen is included in increasing amounts from 0 to 200 ppmv, the mass loading of haze produced decreases nonlinearly. With 200 ppmv molecular oxygen, the mass loading of particles produced is on the order of the amount of organic aerosol in modern Earth’s atmosphere, suggesting that while not a thick organic haze, haze particles produced with 200 ppmv molecular oxygen could still influence planetary climates. Additionally, the hazes produced with increasing amounts of oxygen become increasingly oxidized and the densities increase. For hazes produced with 0, 2 and 20 ppmv oxygen, the densities were found to be 0.94, 1.03 and 1.12 g cm−3, respectively. Moreover, the hazes produced with 0, 2, and 20 ppmv oxygen are found to have real refractive indices of n = 1.58 ± 0.04, 1.53 ± 0.03 and 1.67 ± 0.03, respectively, and imaginary refractive indices of , 0.002 ± 0.002 and , respectively. These k values demonstrate that the particles formed with oxygen have no absorption within our experimental error, and could result in a light scattering layer in an oxygen-containing atmosphere.