气候变化领域集成服务门户(CCPortal): The characteristics of atmospheric brown carbon in Xi'an, inland China: Sources, size distributions and optical properties

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DOI	10.5194/acp-20-2017-2020
	The characteristics of atmospheric brown carbon in Xi'an, inland China: Sources, size distributions and optical properties
	Wu C.; Wang G.; Li J.; Li J.; Cao C.; Ge S.; Xie Y.; Chen J.; Li X.; Xue G.; Wang X.; Zhao Z.; Cao F.
发表日期	2020
ISSN	16807316
起始页码	2017
结束页码	2030
卷号	20 期号:4
英文摘要	To investigate the characteristics of atmospheric brown carbon (BrC) in the semiarid region of East Asia, PM2:5 and size-resolved particles in the urban atmosphere of Xi'an, inland China, during the winter and summer of 2017 were collected and analyzed for optical properties and chemical compositions. Methanol extracts (MeOH extracts) were more light-absorbing than water extracts (H2O extracts) in the optical wavelength of 300-600 nm and well correlated with nitrophenols, polycyclic aromatic hydrocarbons (PAHs) and oxygenated PAHs (r >0:78). The light absorptions (absλD365 nm) of H2O extracts and MeOH extracts in winter were 28±16 and 49±32 M m-1, respectively, which are about 10 times higher than those in summer, mainly due to the enhanced emissions from biomass burning for house heating. Water-extracted BrC predominately occurred in the fine mode (< 2.1 μm) during winter and summer, accounting for 81 % and 65 % of the total absorption of BrC, respectively. The light absorption and stable carbon isotope composition measurements showed an increasing ratio of absλD365 nm-MeOH to absλD550 nm-EC along with an enrichment of 13C in PM2:5 during the haze development, indicating an accumulation of secondarily formed BrC (e.g., nitrophenols) in the aerosol aging process. Positive matrix factorization (PMF) analysis showed that biomass burning, fossil fuel combustion, secondary formation, and fugitive dust are the major sources of BrC in the city, accounting for 55 %, 19 %, 16 %, and 10 % of the total BrC of PM2:5, respectively. © 2020 Author(s).
关键词	brown carbon chemical composition optical property PAH particulate matter seasonal variation size distribution source apportionment urban area China Shaanxi Xian
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132226
推荐引用方式 GB/T 7714	Wu C.,Wang G.,Li J.,et al. The characteristics of atmospheric brown carbon in Xi'an, inland China: Sources, size distributions and optical properties[J]. Atmospheric Chemistry and Physics,2020,20(4).
APA	Wu C..,Wang G..,Li J..,Li J..,Cao C..,...&Cao F..(2020).The characteristics of atmospheric brown carbon in Xi'an, inland China: Sources, size distributions and optical properties.,20(4).
MLA	Wu C.,et al."The characteristics of atmospheric brown carbon in Xi'an, inland China: Sources, size distributions and optical properties".20.4(2020).