气候变化领域集成服务门户(CCPortal): Investigation of Particle Number Concentrations and New Particle Formation With Largely Reduced Air Pollutant Emissions at a Coastal Semi-Urban Site in Northern China

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DOI	10.1029/2021JD035419
	Investigation of Particle Number Concentrations and New Particle Formation With Largely Reduced Air Pollutant Emissions at a Coastal Semi-Urban Site in Northern China
	Zhu Y.; Shen Y.; Li K.; Meng H.; Sun Y.; Yao X.; Gao H.; Xue L.; Wang W.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:17
英文摘要	To better understand the responses of particle number concentrations (PNCs) and new particle formation (NPF) to the largely reduced air pollutant emissions in urban atmospheres, we investigated the particle number size distributions in Qingdao, a coastal megacity in northern China, during two separate periods, 2010–2012 and 2016–2018. The results show only an average of 5% decrease in the total PNCs in 2016–2018 relative to 2010–2012, although the PM2.5 mass concentration decreased by over 40%. Nucleation-mode PNCs decreased by 20%, which is attributable to reductions in primary emissions from on-road vehicles and secondary sources. Unexpectedly, the accumulation-mode PNCs increased by 11% in 2016–2018 relative to 2010–2012. The SO2 concentrations strongly decreased by ∼60%, and the NPF frequencies slightly decreased from 34% in 2010–2012 to 25% in 2016–2018. However, there were no significant changes in the apparent new particle formation rate (FR) or net maximum increase in nucleation-mode PNCs (NMINP). The increased concentrations of other precursors may substantially negate the effect of SO2 reduction, leading to the invariant FR and NMINP. The maximum sizes of grown new particles decreased by 50%; combined with the decreased NPF frequency, the contribution of grown new particles to accumulation-mode PNCs expectedly decreased in 2016–2018 relative to 2010–2012. Alternatively, the increased accumulation-mode PNCs in 2016–2018 mainly attribute to the enhanced primary combustion emissions excluding on-road vehicle emissions. The increase in accumulation-mode PNCs in 2016–2018 provides insights on the inter-annual variation in satellite-based cloud properties, which appeared insensitive to the large decrease in satellite-based aerosol optical depth. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	anthropogenic emissions; biogenic organic compounds; new particle formation; northern China; particle number concentration
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237037
作者单位	Environment Research Institute, Shandong University, Qingdao, China; Key Laboratory of Marine Environment and Ecology, and Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ministry of Education, Ocean University of China, Qingdao, China; Centre for Sustainable Development and Energy Policy Research, School of Energy and Mining Engineering, China University of Mining & Technology, Beijing, China; Qingdao Eco-environment Monitoring Center of Shandong Province, Qingdao, China; Laboratory for Marine Ecology and Environmental Sciences, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Collaborative Innovation Center for Climate Change, Nanjing, China
推荐引用方式 GB/T 7714	Zhu Y.,Shen Y.,Li K.,et al. Investigation of Particle Number Concentrations and New Particle Formation With Largely Reduced Air Pollutant Emissions at a Coastal Semi-Urban Site in Northern China[J],2021,126(17).
APA	Zhu Y..,Shen Y..,Li K..,Meng H..,Sun Y..,...&Wang W..(2021).Investigation of Particle Number Concentrations and New Particle Formation With Largely Reduced Air Pollutant Emissions at a Coastal Semi-Urban Site in Northern China.Journal of Geophysical Research: Atmospheres,126(17).
MLA	Zhu Y.,et al."Investigation of Particle Number Concentrations and New Particle Formation With Largely Reduced Air Pollutant Emissions at a Coastal Semi-Urban Site in Northern China".Journal of Geophysical Research: Atmospheres 126.17(2021).