Secondary inorganic aerosols and aerosol acidity at different PM2.5 pollution levels during winter haze episodes in the Sichuan Basin, China
文献类型：期刊论文
| 作者 | Fu, Xiaoxin2; Wang, Xinming1,3; Liu, Tengyu4; He, Quanfu5; Zhang, Zhou1,3; Zhang, Yanli1,3 ; Song, Wei1,3; Dai, Qunwei2; Chen, Shu2; Dong, Faqin2
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| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
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| 出版日期 | 2024-03-25 |
| 卷号 | 918页码:11 |
| 关键词 | PM2.5 Secondary inorganic aerosols Aerosol acidity Liquid water contents The Sichuan Basin |
| ISSN号 | 0048-9697 |
| DOI | 10.1016/j.scitotenv.2024.170512 |
| 英文摘要 | Wintertime fine particle (PM2.5) pollution remains to be perplexing air quality problems in many parts of China. In this study, PM2.5 compositions and aerosol acidity at different pollution levels at an urban cite in the southwest China's Sichuan Basin were investigated during a sustained winter haze episode. Organic matter was the most abundant component of PM2.5, followed by nitrate, sulfate and ammonium. Shares of organic aerosol in PM2.5 mass decreased with the elevated PM(2.5 )levels, while the enhancements of sulfate and secondary organic aerosol were much less than that of nitrate and ammonium during heavy pollution with increased ratios of nitrate to sulfate, implying a significant role of nitrate in the haze formation. Results also suggest the nighttime chemistry might contribute substantially to the formation of nitrate under severe pollutions. The daily average aerosol pH showed a decreasing trend with the elevated levels of PM2.5, and this increased aerosl acidity was mainly due to the fast rising secondary inorganic aerosol (SIA) concentration, with the increase in hydronium ion concentration in air (Hair+) surpassing the dilution effect of elevated aerosol liquid water content (LWC). Thermodynamic model calculations revealed that the air environment was NH3-rich with total NHx (NH3 + NH4+) greater than required NHx, and the aerosol pH exponentially declined with the decreasing excess NHx (p < 0.01). This study demonstrated that under air stagnation and NH3-rich environment during winter, the raised relative humidity (RH) would lead to an increase in LWC and thereby facilitate the aqueous chemistry processes with the neutralization capacity of NH3 to form sulfate and nitrate, which would further increase the LWC and lower the pH. This self -amplifying SIA formation might be crucial to the severe PM2.5 pollution and haze events during winter, and therefore cutting both NOx and NH3 emissions would benefit stopping the self -amplification. |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:001183592500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77309]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Wang, Xinming |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 2.Southwest Univ Sci & Technol, Key Lab Solid Waste Treatment & Resource Recycle, Minist Educ, Mianyang 621010, Peoples R China 3.Guangzhou Inst Geochem, Chinese Acad Sci, Guangdong Key Lab Environm Protect & Resources Uti, Guangzhou 510640, Peoples R China 4.Nanjing Univ, Sch Atmospher Sci, Joint Int Res Lab Atmospher & Earth Syst Sci, Nanjing 210023, Peoples R China 5.Forschungszentrum Julich, Inst Energy & Climate Res, IEK 8, D-52425 Julich, Germany |
| 推荐引用方式 GB/T 7714 | Fu, Xiaoxin,Wang, Xinming,Liu, Tengyu,et al. Secondary inorganic aerosols and aerosol acidity at different PM2.5 pollution levels during winter haze episodes in the Sichuan Basin, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024,918:11. |
| APA | Fu, Xiaoxin.,Wang, Xinming.,Liu, Tengyu.,He, Quanfu.,Zhang, Zhou.,...&Dong, Faqin.(2024).Secondary inorganic aerosols and aerosol acidity at different PM2.5 pollution levels during winter haze episodes in the Sichuan Basin, China.SCIENCE OF THE TOTAL ENVIRONMENT,918,11. |
| MLA | Fu, Xiaoxin,et al."Secondary inorganic aerosols and aerosol acidity at different PM2.5 pollution levels during winter haze episodes in the Sichuan Basin, China".SCIENCE OF THE TOTAL ENVIRONMENT 918(2024):11. |
入库方式： OAI收割
来源：广州地球化学研究所
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