气候变化领域集成服务门户(CCPortal): Influence of organic aerosol molecular composition on particle absorptive properties in autumn Beijing

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DOI	10.5194/acp-22-1251-2022
	Influence of organic aerosol molecular composition on particle absorptive properties in autumn Beijing
	Cai, Jing; Wu, Cheng; Wang, Jiandong; Du, Wei; Zheng, Feixue; Hakala, Simo; Fan, Xiaolong; Chu, Biwu; Yao, Lei; Feng, Zemin; Liu, Yongchun; Sun, Yele; Zheng, Jun; Yan, Chao; Bianchi, Federico; Kulmala, Markku; Mohr, Claudia; Daellenbach, Kaspar R.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	1251
结束页码	1269
卷号	22 期号:2 页码:19
英文摘要	Organic aerosol (OA) is a major component of fine particulate matter (PM), affecting air quality, human health, and the climate. The absorptive and reflective behavior of OA components contributes to determining particle optical properties and thus their effects on the radiative budget of the troposphere. There is limited knowledge on the influence of the molecular composition of OA on particle optical properties in the polluted urban environment. In this study, we characterized the molecular composition of oxygenated OA collected on filter samples in the autumn of 2018 in Beijing, China, with a filter inlet for gases and aerosols coupled to a high-resolution time-of-flight chemical ionization mass spectrometer (FIGAERO-CIMS). Three haze episodes occurred during our sampling period with daily maximum concentrations of OA of 50, 30, and 55 mu g m(-3). We found that the signal intensities of dicarboxylic acids and sulfur-containing compounds increased during the two more intense haze episodes, while the relative contributions of wood-burning markers and other aromatic compounds were enhanced during the cleaner periods. We further assessed the optical properties of oxygenated OA components by combining detailed chemical composition measurements with collocated particle light absorption measurements. We show that light absorption enhancement (E-abs) of black carbon (BC) was mostly related to more oxygenated OA (e.g., dicarboxylic acids), likely formed in aqueous-phase reactions during the intense haze periods with higher relative humidity, and speculate that they might contribute to lensing effects. Aromatics and nitro-aromatics (e.g., nitrocatechol and its derivatives) were mostly related to a high light absorption coefficient (b(abs)) consistent with light-absorbing (brown) carbon (BrC). Our results provide information on oxygenated OA components at the molecular level associated with BrC and BC particle light absorption and can serve as a basis for further studies on the effects of anthropogenic OA on radiative forcing in the urban environment.
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:000751158100001
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/273897
作者单位	Beijing University of Chemical Technology; University of Helsinki; Stockholm University; Nanjing University of Information Science & Technology; Chinese Academy of Sciences; Research Center for Eco-Environmental Sciences (RCEES); Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS; Nanjing University of Information Science & Technology; Nanjing University; Lomonosov Moscow State University; Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute
推荐引用方式 GB/T 7714	Cai, Jing,Wu, Cheng,Wang, Jiandong,et al. Influence of organic aerosol molecular composition on particle absorptive properties in autumn Beijing[J],2022,22(2):19.
APA	Cai, Jing.,Wu, Cheng.,Wang, Jiandong.,Du, Wei.,Zheng, Feixue.,...&Daellenbach, Kaspar R..(2022).Influence of organic aerosol molecular composition on particle absorptive properties in autumn Beijing.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(2),19.
MLA	Cai, Jing,et al."Influence of organic aerosol molecular composition on particle absorptive properties in autumn Beijing".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.2(2022):19.