气候变化领域集成服务门户(CCPortal): Significant contrasts in aerosol acidity between China and the United States

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DOI	10.5194/acp-21-8341-2021
	Significant contrasts in aerosol acidity between China and the United States
	Zhang B.; Shen H.; Liu P.; Guo H.; Hu Y.; Chen Y.; Xie S.; Xi Z.; Nash Skipper T.; Russell A.G.
发表日期	2021
ISSN	1680-7316
起始页码	8341
结束页码	8356
卷号	21 期号:10
英文摘要	Aerosol acidity governs several key processes in aerosol physics and chemistry, thus affecting aerosol mass and composition and ultimately climate and human health. Previous studies have reported aerosol pH values separately in China and the United States (USA), implying different aerosol acidity between these two countries. However, there is debate about whether mass concentration or chemical composition is the more important driver of differences in aerosol acidity. A full picture of the pH difference and the underlying mechanisms responsible is hindered by the scarcity of simultaneous measurements of particle composition and gaseous species, especially in China. Here we conduct a comprehensive assessment of aerosol acidity in China and the USA using extended ground-level measurements and regional chemical transport model simulations. We show that aerosols in China are significantly less acidic than in the USA, with pH values 1-2 units higher. Based on a proposed multivariable Taylor series method and a series of sensitivity tests, we identify major factors leading to the pH difference. Compared to the USA, China has much higher aerosol mass concentrations (gas C particle, by a factor of 8.4 on average) and a higher fraction of total ammonia (gas C particle) in the aerosol composition. Our assessment shows that the differences in mass concentrations and chemical composition play equally important roles in driving the aerosol pH difference between China and the USA-increasing the aerosol mass concentrations (by a factor of 8.4) but keeping the relative component contributions the same in the USA as the level in China increases the aerosol pH by ∼ 1.0 units and further shifting the chemical composition from US conditions to China's that are richer in ammonia increases the aerosol pH by ∼ 0.9 units. Therefore, China being both more polluted than the USA and richer in ammonia explains the aerosol pH difference. The difference in aerosol acidity highlighted in the present study implies potential differences in formation mechanisms, physicochemical properties, and toxicity of aerosol particles in these two countries. © 2021 Author(s).
语种	英语
scopus关键词	acidity; aerosol; ammonia; chemical composition; concentration (composition); pH; physicochemical property; toxicity; China; United States
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/246845
作者单位	School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, United States; School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, China; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States; Department of Chemistry, University of Colorado, Boulder, CO 80309, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, United States; College of Environmental Sciences and Engineering, State Key Joint Laboratory of Environmental Simulation and Pollution Control, Peking University, Beijing, 100871, China
推荐引用方式 GB/T 7714	Zhang B.,Shen H.,Liu P.,et al. Significant contrasts in aerosol acidity between China and the United States[J],2021,21(10).
APA	Zhang B..,Shen H..,Liu P..,Guo H..,Hu Y..,...&Russell A.G..(2021).Significant contrasts in aerosol acidity between China and the United States.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(10).
MLA	Zhang B.,et al."Significant contrasts in aerosol acidity between China and the United States".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.10(2021).