Optical properties of secondary organic aerosols generated by photooxidation of aromatic hydrocarbons.
Optical properties of secondary organic aerosols generated by photooxidation of aromatic hydrocarbons.
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芳烃光氧化产生的二次有机气溶胶的光学性质
DOI：
10.1038/srep04922
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发表时间：
2014-05-12
影响因子：
4.6
通讯作者：
Wang D
中科院分区：
文献类型：
--
作者：
Li K;Wang W;Ge M;Li J;Wang D
折射率（RI）是影响气溶胶光学特性的基本特征，而气溶胶光学特性可能是影响直接辐射强迫的一些最重要因素。本研究探讨了苯、甲苯、乙苯和间二甲苯（BTEX）在低氧和高氧条件下光氧化产生的二次有机气溶胶（SOAs）。在我们的实验中产生的粒子被认为是球形的，基于原子力显微镜（AFM）图像和波长532 nm的非吸收性，由紫外-可见光（UV-Vis）光谱确定。soa在532 nm处获得的RIs范围为1.38-1.59，这取决于几个因素，例如不同的前体和nox水平。随着nox浓度的增加，SOAs的RIs发生了不同的变化：苯和甲苯衍生的SOAs的RIs增加，而乙苯和间二甲苯衍生的SOAs的RIs降低。最后，通过将实验数据与模式值进行比较，我们发现模式可能在一定程度上高估了SOA粒子的RI值，从而高估了有机粒子的全球直接辐射强迫。
The refractive index (RI) is the fundamental characteristic that affects the optical properties of aerosols, which could be some of the most important factors influencing direct radiative forcing. The secondary organic aerosols (SOAs) generated by the photooxidation of benzene, toluene, ethylbenzene andm-xylene (BTEX) under low-NOxand high-NOxconditions are explored in this study. The particles generated in our experiments are considered to be spherical, based on atomic force microscopy (AFM) images and nonabsorbent at a wavelength of 532 nm, as determined by ultraviolet-visible light (UV-Vis) spectroscopy. The retrieved RIs at 532 nm for the SOAs range from 1.38–1.59, depending on several factors, such as different precursors and NOxlevels. The RIs of the SOAs are altered differently as the NOxconcentration increases as follows: the RIs of the SOAs derived from benzene and toluene increase, whereas those of the SOAs derived from ethylbenzene andm-xylene decrease. Finally, by comparing the experimental data with the model values, we demonstrate that the models likely overestimate the RI values of the SOA particles to a certain extent, which in turn overestimates the global direct radiative forcing of the organic particles.
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