气候变化领域集成服务门户(CCPortal): Sources and formation of carbonaceous aerosols in Xi'an; China: Primary emissions and secondary formation constrained by radiocarbon

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DOI	10.5194/acp-19-15609-2019
	Sources and formation of carbonaceous aerosols in Xi'an; China: Primary emissions and secondary formation constrained by radiocarbon
	Ni H.; Huang R.-J.; Cao J.; Guo J.; Deng H.; Dusek U.
发表日期	2019
ISSN	16807316
起始页码	15609
结束页码	15628
卷号	19 期号:24
英文摘要	To investigate the sources and formation mechanisms of carbonaceous aerosols, a major contributor to severe particulate air pollution, radiocarbon (14C) measurements were conducted on aerosols sampled from November 2015 to November 2016 in Xi'an, China. Based on the 14C content in elemental carbon (EC), organic carbon (OC) and waterinsoluble OC (WIOC), contributions of major sources to carbonaceous aerosols are estimated over a whole seasonal cycle: primary and secondary fossil sources, primary biomass burning, and other non-fossil carbon formed mainly from secondary processes. Primary fossil sources of EC were further sub-divided into coal and liquid fossil fuel combustion by complementing 14C data with stable carbon isotopic signatures. The dominant EC source was liquid fossil fuel combustion (i.e., vehicle emissions), accounting for 64 % (median; 45 %-74 %, interquartile range) of EC in autumn, 60 % (41 %-72 %) in summer, 53 % (33 %-69 %) in spring and 46 % (29 %-59 %) in winter. An increased contribution from biomass burning to EC was observed in winter (∼ 28 %) compared to other seasons (warm period; ∼ 15 %). In winter, coal combustion (∼ 25 %) and biomass burning equally contributed to EC, whereas in the warm period, coal combustion accounted for a larger fraction of EC than biomass burning. The relative contribution of fossil sources to OC was consistently lower than that to EC, with an annual average of 47 ± 4 %. Non-fossil OC of secondary origin was an important contributor to total OC (35 ± 4 %) and accounted for more than half of non-fossil OC (67 ± 6 %) throughout the year. Secondary fossil OC (SOCfossil) concentrations were higher than primary fossil OC (POCfossil) concentrations in winter but lower than POCfossil in the warm period. Fossil WIOC and water-soluble OC (WSOC) have been widely used as proxies for POCfossil and SOCfossil, respectively. This assumption was evaluated by (1) comparing their mass concentrations with POCfossil and SOCfossil and (2) comparing ratios of fossil WIOC to fossil EC to typical primary OC-to-EC ratios from fossil sources including both coal combustion and vehicle emissions. The results suggest that fossil WIOC and fossil WSOC are probably a better approximation for primary and secondary fossil OC, respectively, than POCfossil and SOCfossil estimated using the EC tracer method. © 2019 Author(s).
语种	英语
scopus关键词	aerosol; atmospheric pollution; carbon emission; concentration (composition); particulate matter; radiocarbon dating; seasonal variation; source apportionment; China; Shaanxi; Xian
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/143948
作者单位	State Key Laboratory of Loess and Quaternary Geology, Key Laboratory of Aerosol Chemistry and Physics, Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; Centre for Isotope Research (CIO), Energy and Sustainability Research Institute Groningen (ESRIG), University of Groningen, Groningen, 9747 AG, Netherlands; University of Chinese Academy of Sciences, Beijing, 100049, China; Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710049, China
推荐引用方式 GB/T 7714	Ni H.,Huang R.-J.,Cao J.,et al. Sources and formation of carbonaceous aerosols in Xi'an; China: Primary emissions and secondary formation constrained by radiocarbon[J],2019,19(24).
APA	Ni H.,Huang R.-J.,Cao J.,Guo J.,Deng H.,&Dusek U..(2019).Sources and formation of carbonaceous aerosols in Xi'an; China: Primary emissions and secondary formation constrained by radiocarbon.Atmospheric Chemistry and Physics,19(24).
MLA	Ni H.,et al."Sources and formation of carbonaceous aerosols in Xi'an; China: Primary emissions and secondary formation constrained by radiocarbon".Atmospheric Chemistry and Physics 19.24(2019).