气候变化领域集成服务门户(CCPortal): Strong light scattering of highly oxygenated organic aerosols impacts significantly on visibility degradation

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DOI	10.5194/acp-22-7713-2022
	Strong light scattering of highly oxygenated organic aerosols impacts significantly on visibility degradation
	Liu, Li; Kuang, Ye; Zhai, Miaomiao; Xue, Biao; He, Yao; Tao, Jun; Luo, Biao; Xu, Wanyun; Tao, Jiangchuan; Yin, Changqin; Li, Fei; Xu, Hanbing; Deng, Tao; Deng, Xuejiao; Tan, Haobo; Shao, Min
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	7713
结束页码	7726
卷号	22 期号:11 页码:14
英文摘要	Secondary organic aerosols (SOAs) account for a large fraction of atmospheric aerosol mass and play significant roles in visibility impairment by scattering solar radiation. However, comprehensive evaluations of SOA scattering abilities under ambient relative humidity (RH) conditions on the basis of field measurements are still lacking due to the difficulty of simultaneously direct quantifications of SOA scattering efficiency in dry state and SOA water uptake abilities. In this study, field measurements of aerosol chemical and physical properties were conducted in winter in Guangzhou (lasting about 3 months) using a humidified nephelometer system and aerosol chemical speciation monitor. A modified multilinear regression model was proposed to retrieve dry-state mass scattering efficiencies (MSEs, defined as scattering coefficient per unit aerosol mass) of aerosol components. The more oxidized oxygenated organic aerosol (MOOA) with an O/C ratio of 1.17 was identified as the most efficient light scattering aerosol component. On average, 34 % mass contribution of MOOA to total submicron organic aerosol mass contributed 51 % of dry-state organic aerosol scattering. The overall organic aerosol hygroscopicity parameter kappa(OA) was quantified directly through hygroscopicity closure, and hygroscopicity parameters of SOA components were further retrieved using a multilinear regression model by assuming hydrophobic properties of primary organic aerosols. The highest water uptake ability of MOOA among organic aerosol factors was revealed with kappa(MOOA) reaching 0.23, thus further enhancing the fractional contribution of MOOA in ambient organic aerosol scattering. In particular, the scattering abilities of MOOA were found to be even higher than those of ammonium nitrate under RH of < 70 %, which was identified as the most efficient inorganic scattering aerosol component, demonstrating that MOOA had the strongest scattering abilities in ambient air (average RH of 57 %) during winter in Guangzhou. During the observation period, secondary aerosols contributed dominantly to visibility degradation (similar to 70 %), with substantial contributions from MOOA (16 % on average), demonstrating significant impacts of MOOA on visibility degradation. The findings of this study demonstrate that more attention needs to be paid to SOA property changes in future visibility improvement investigations. Also, more comprehensive studies on MOOA physical properties and chemical formation are needed to better parameterize its radiative effects in models and implement targeted control strategies on MOOA precursors for visibility improvement.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000810912000001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273365
作者单位	China Meteorological Administration; Jinan University; Chinese Academy of Meteorological Sciences (CAMS); Chinese Academy of Sciences; Chinese Academy of Meteorological Sciences (CAMS); Sun Yat Sen University
推荐引用方式 GB/T 7714	Liu, Li,Kuang, Ye,Zhai, Miaomiao,et al. Strong light scattering of highly oxygenated organic aerosols impacts significantly on visibility degradation[J],2022,22(11):14.
APA	Liu, Li.,Kuang, Ye.,Zhai, Miaomiao.,Xue, Biao.,He, Yao.,...&Shao, Min.(2022).Strong light scattering of highly oxygenated organic aerosols impacts significantly on visibility degradation.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(11),14.
MLA	Liu, Li,et al."Strong light scattering of highly oxygenated organic aerosols impacts significantly on visibility degradation".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.11(2022):14.