气候变化领域集成服务门户(CCPortal): Contrasting sources and processes of particulate species in haze days with low and high relative humidity in wintertime Beijing

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DOI	10.5194/acp-20-9101-2020
	Contrasting sources and processes of particulate species in haze days with low and high relative humidity in wintertime Beijing
	Huang R.-J.; He Y.; Duan J.; Li Y.; Chen Q.; Zheng Y.; Chen Y.; Hu W.; Lin C.; Ni H.; Dai W.; Cao J.; Wu Y.; Zhang R.; Xu W.; Ovadnevaite J.; Ceburnis D.; Hoffmann T.; D. ODowd C.
发表日期	2020
ISSN	1680-7316
起始页码	9101
结束页码	9114
卷号	20 期号:14
英文摘要	Although there are many studies of particulate matter (PM) pollution in Beijing, the sources and processes of secondary PM species during haze periods remain unclear. Limited studies have investigated the PM formation in highly polluted environments under low- and high-relative-humidity (RH) conditions. Herein, we present a systematic comparison of species in submicron particles (PM1) in wintertime Beijing (29 December 2014 to 28 February 2015) for clean periods and pollution periods under low- and high-RH conditions. PM1 species were measured with an aerosol chemical pecies monitor (ACSM) and an Aethalometer. Sources and processes for organic aerosol (OA) were resolved by positive matrix factorization (PMF) with a multilinear engine 2 (ME-2). The comparisons for clean, low-RH pollution and high-RH pollution periods are made from three different aspects, namely (a) mass concentration, (b) mass fraction and (c) growth rate in diurnal profiles. OA is the dominant component of PM1, with an average mass concentration of 56.7 ugm3 (46 ) during high-RH pollution and 67.7 ugm3 (54 ) during low-RH pollution periods. Sulfate had higher concentration and mass fraction during high-RH pollution periods, while nitrate had higher concentration and mass fraction during low-RH pollution periods. The diurnal variations of nitrate and oxygenated organic aerosol (OOA) showed a daytime increase in their concentrations during all three types of periods. Nitrate had similar growth rates during low-RH (0.40 ugm3 h1) and high-RH (0.55 ugm3 h1) pollution periods. OOA had a higher growth rate during low- RH pollution periods (1.0 ugm3 h1) than during high-RH pollution periods (0.40 ugm3 h1). In contrast, sulfate had a decreasing trend during low-RH pollution periods, while it increased significantly with a growth rate of 0.81 ugm3 h1 during high-RH pollution periods. These distinctions in mass concentrations, mass fractions and daytime growth rates may be explained by the difference in the formation processes affected by meteorological conditions. In particular, photochemical oxidation and aqueous-phase processes may both produce sulfate and nitrate. The relative importance of the two pathways, however, differs under different meteorological conditions. Additional OOA formation under high- RH (> 70 ) conditions suggests aqueous-related formation pathways. This study provides a general picture of the haze formation in Beijing under different meteorological conditions. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; atmospheric pollution; concentration (composition); haze; particulate matter; relative humidity; seasonal variation; source apportionment; Beijing [Beijing (ADS)]; Beijing [China]; China
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/141180
作者单位	State Key Laboratory of Loess and Quaternary Geology, Center for Excellence in Quaternary Science and Global Change, Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth and Environment, Chinese Academy of Sciences, Xian, 710061, China; Open Studio for Oceanic-Continental Climate and Environment Changes, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, 266061, China; Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau; State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; State Key Laboratory of Organic Geochemistry and Guangdong, Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Gua...
推荐引用方式 GB/T 7714	Huang R.-J.,He Y.,Duan J.,et al. Contrasting sources and processes of particulate species in haze days with low and high relative humidity in wintertime Beijing[J],2020,20(14).
APA	Huang R.-J..,He Y..,Duan J..,Li Y..,Chen Q..,...&D. ODowd C..(2020).Contrasting sources and processes of particulate species in haze days with low and high relative humidity in wintertime Beijing.Atmospheric Chemistry and Physics,20(14).
MLA	Huang R.-J.,et al."Contrasting sources and processes of particulate species in haze days with low and high relative humidity in wintertime Beijing".Atmospheric Chemistry and Physics 20.14(2020).