Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-17-9979-2017 |
Seasonal variations in high time-resolved chemical compositions, sources, and evolution of atmospheric submicron aerosols in the megacity Beijing | |
Hu, Wei1,3; Hu, Min1,2; Hu, Wei-Wei1,4; Zheng, Jing1; Chen, Chen1; Wu, Yusheng1; Guo, Song1 | |
2017-08-25 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:16 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Japan; USA |
英文摘要 | A severe regional haze problem in the megacity Beijing and surrounding areas, caused by fast formation and growth of fine particles, has attracted much attention in recent years. In order to investigate the secondary formation and aging process of urban aerosols, four intensive campaigns were conducted in four seasons between March 2012 and March 2013 at an urban site in Beijing (116.31 degrees E, 37.99 degrees N). An Aerodyne high-resolution time-of-flight aerosol mass spectrometry (HRToF-AMS) was deployed to measure non-refractory chemical components of submicron particulate matter (NR-PM1). The average mass concentrations of PM1 (NR-PM1 +black carbon) were 45.1 +/- 45.8, 37.5 +/- 31.0, 41.3 +/- 42.7, and 81.7 +/- 72.4 mu g m(-3) in spring, summer, autumn, and winter, respectively. Organic aerosol (OA) was the most abundant component in PM1, accounting for 31, 33, 44, and 36% seasonally, and secondary inorganic aerosol (SNA, sum of sulfate, nitrate, and ammonium) accounted for 59, 57, 43, and 55% of PM1 correspondingly. Based on the application of positive matrix factorization (PMF), the sources of OA were obtained, including the primary ones of hydrocarbon-like (HOA), cooking (COA), biomass burning OA (BBOA) and coal combustion OA (CCOA), and secondary component oxygenated OA (OOA). OOA, which can be split into more-oxidized (MO-OOA) and less-oxidized OOA (LO-OOA), accounted for 49, 69, 47, and 50% in four seasons, re-spectively. Totally, the fraction of secondary components (OOA+SNA) contributed about 60-80% to PM1, suggesting that secondary formation played an important role in the PM pollution in Beijing, and primary sources were also non-negligible. The evolution process of OA in different seasons was investigated with multiple metrics and tools. The average carbon oxidation states and other metrics show that the oxidation state of OA was the highest in summer, probably due to both strong photochemical and aqueous-phase oxidations. It was indicated by the good correlations (r = 0.53-0.75, p < 0.01) between LO-OOA and odd oxygen (O-x = O-3 + NO2), and between MO-OOA and liquid water content in aerosols. BBOA was resolved in spring and autumn, influenced by agricultural biomass burning (e.g., field preparation burnings, straw burning after the harvest). CCOA was only identified in winter due to domestic heating. These results signified that the comprehensive management for biomass burning and coal combustion emissions is needed. High concentrations of chemical components in PM1 in Beijing, especially in winter or in adverse meteorological conditions, suggest that further strengthening the regional emission control of primary particulate and precursors of secondary species is expected. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000408547700003 |
WOS关键词 | SECONDARY ORGANIC AEROSOL ; BIOMASS BURNING CONTRIBUTION ; FINE-PARTICLE COMPOSITION ; MASS-SPECTROMETRY ; MEXICO-CITY ; RURAL SITE ; CARBONACEOUS AEROSOL ; SOURCE APPORTIONMENT ; HAZE FORMATION ; UNITED-STATES |
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/30633 |
专题 | 地球科学 |
作者单位 | 1.Peking Univ, Coll Environm Sci & Engn, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100871, Peoples R China; 2.Peking Univ, Beijing Innovat Ctr Engn Sci & Adv Technol, Beijing 100871, Peoples R China; 3.Prefectural Univ Kumamoto, Grad Sch Environm & Symbiot Sci, Kumamoto 8628502, Japan; 4.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Hu, Wei,Hu, Min,Hu, Wei-Wei,et al. Seasonal variations in high time-resolved chemical compositions, sources, and evolution of atmospheric submicron aerosols in the megacity Beijing[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(16). |
APA | Hu, Wei.,Hu, Min.,Hu, Wei-Wei.,Zheng, Jing.,Chen, Chen.,...&Guo, Song.(2017).Seasonal variations in high time-resolved chemical compositions, sources, and evolution of atmospheric submicron aerosols in the megacity Beijing.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(16). |
MLA | Hu, Wei,et al."Seasonal variations in high time-resolved chemical compositions, sources, and evolution of atmospheric submicron aerosols in the megacity Beijing".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.16(2017). |
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