GSTDTAP  > 地球科学
DOI10.5194/acp-20-3793-2020
Summertime and wintertime atmospheric processes of secondary aerosol in Beijing
Duan, Jing1; 39;Dowd, Colin2
2020-03-31
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2020
卷号20期号:6页码:3793-3807
文章类型Article
语种英语
国家Peoples R China; Ireland; USA; Germany
英文摘要

Secondary aerosol constitutes a large fraction of fine particles in urban air of China. However, its formation mechanisms and atmospheric processes remain largely uncertain despite considerable study in recent years. To elucidate the seasonal variations in fine-particle composition and secondary aerosol formation, an Aerodyne quadrupole aerosol chemical speciation monitor (Q-ACSM), combined with other online instruments, was used to characterize the sub-micrometer particulate matter (diameter < 1 mu m, PM1) in Beijing during summer and winter 2015. Our results suggest that photochemical oxidation was the major pathway for sulfate formation during summer, whereas aqueous-phase reaction became an important process for sulfate formation during winter. High concentrations of nitrate (17% of the PM1 mass) were found during winter, explained by enhanced gas-to-particle partitioning at low temperature, while high nitrate concentrations (19 %) were also observed under the conditions of high relative humidity (RH) during summer, likely due to the hydrophilic property of NH4NO3 and hydrolysis of N2O5. As for organic aerosol (OA) sources, secondary OA (SOA) dominated the OA mass (74 %) during summer, while the SOA contribution decreased to 39% during winter due to enhanced primary emissions in the heating season. In terms of the SOA formation, photochemical oxidation perhaps played an important role for summertime oxygenated OA (OOA) formation and less-oxidized wintertime OOA (LO-OOA) formation. The wintertime more-oxidized OOA (MO-OOA) showed a good correlation with aerosol liquid water content (ALWC), indicating a more important contribution of aqueous-phase processing over photochemical production to MO-OOA. Meanwhile, the dependence of LO-OOA and the mass ratio of LO-OOA to MO-OOA on atmospheric oxidative tracer (i.e., O-x) both degraded when RH was greater than 60 %, suggesting that RH or aerosol liquid water may also affect LO-OOA formation.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000522825000001
WOS关键词CHEMICAL-COMPOSITION ; SOURCE APPORTIONMENT ; SUBMICRON AEROSOLS ; ORGANIC AEROSOL ; SEVERE HAZE ; SEASONAL-VARIATIONS ; MULTILINEAR ENGINE ; CHINA ; POLLUTION ; EVOLUTION
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/278718
专题地球科学
作者单位1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Key Lab Aerosol Chem & Phys, Xian 710061, Peoples R China;
2.Chinese Acad Sci, CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China;
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
4.Univ Macau, Fac Sci & Technol, Dept Civil & Environm Engn, Taipa 999078, Macao, Peoples R China;
5.Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China;
6.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China;
7.Natl Univ Ireland Galway, Sch Phys, Ryan Inst, Univ Rd, Galway H91 CF50, Ireland;
8.Natl Univ Ireland Galway, Ctr Climate & Air Pollut Studies, Ryan Inst, Univ Rd, Galway H91 CF50, Ireland;
9.Natl Ctr Nanosci & Technol, CAS Key Lab Biol Effects Nanomat & Nanosafety, Beijing 100191, Peoples R China;
10.Aerodyne Res Inc, Billerica, MA 01821 USA;
11.Johannes Gutenberg Univ Mainz, Inst Inorgan & Analyt Chem, Duesbergweg 10-14, D-55128 Mainz, Germany
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Duan, Jing,39;Dowd, Colin. Summertime and wintertime atmospheric processes of secondary aerosol in Beijing[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(6):3793-3807.
APA Duan, Jing,&39;Dowd, Colin.(2020).Summertime and wintertime atmospheric processes of secondary aerosol in Beijing.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(6),3793-3807.
MLA Duan, Jing,et al."Summertime and wintertime atmospheric processes of secondary aerosol in Beijing".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.6(2020):3793-3807.
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