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DOI	10.5194/acp-21-18271-2021
	Urban aerosol chemistry at a land-water transition site during summer - Part 2: Aerosol pH and liquid water content
	Battaglia M.A.; Balasus N.; Ball K.; Caicedo V.; Delgado R.; Carlton A.G.; Hennigan C.J.
发表日期	2021
ISSN	1680-7316
起始页码	18271
结束页码	18281
卷号	21 期号:24
英文摘要	Particle acidity (aerosol pH) is an important driver of atmospheric chemical processes and the resulting effects on human and environmental health. Understanding the factors that control aerosol pH is critical when enacting control strategies targeting specific outcomes. This study characterizes aerosol pH at a land-water transition site near Baltimore, MD, during summer 2018 as part of the second Ozone Water-Land Environmental Transition Study (OWLETS-2) field campaign. Inorganic fine-mode aerosol composition, gas-phase NH3 measurements, and all relevant meteorological parameters were used to characterize the effects of temperature, aerosol liquid water (ALW), and composition on predictions of aerosol pH. Temperature, the factor linked to the control of NH3 partitioning, was found to have the most significant effect on aerosol pH during OWLETS-2. Overall, pH varied with temperature at a rate of -0.047gK-1 across all observations, though the sensitivity was -0.085gK-1 for temperatures >g293gK. ALW had a minor effect on pH, except at the lowest ALW levels (g7.96gμgm-3) during the study are analyzed; aerosol pH was higher by only g1/4g0.1-0.2gpH units during these events compared to the study mean. A case study was analyzed to characterize the response of aerosol pH to nonvolatile cations (NVCs) during a period strongly influenced by primary Chesapeake Bay emissions. Depending on the method used, aerosol pH was estimated to be either weakly (g1/4g0.1gpH unit change based on NH3 partitioning calculation) or strongly (g1/4g1.4gpH unit change based on ISORROPIA thermodynamic model predictions) affected by NVCs. The case study suggests a strong pH gradient with size during the event and underscores the need to evaluate assumptions of aerosol mixing state applied to pH calculations. Unique features of this study, including the urban land-water transition site and the strong influence of NH3 emissions from both agricultural and industrial sources, add to the understanding of aerosol pH and its controlling factors in diverse environments. © 2021 Michael A. Battaglia Jr. et al.
语种	英语
scopus关键词	aerosol; atmospheric chemistry; pH; summer; urban atmosphere; water content; Baltimore; Maryland; 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/246367
作者单位	Department of Chemical Biochemical and Environmental Engineering, University of Maryland, Baltimore County, Baltimore, MD, United States; Joint Center for Earth Systems Technology, University of Maryland, Baltimore County, Baltimore, MD, United States; Department of Chemistry, University of California, Irvine, CA, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States
推荐引用方式 GB/T 7714	Battaglia M.A.,Balasus N.,Ball K.,et al. Urban aerosol chemistry at a land-water transition site during summer - Part 2: Aerosol pH and liquid water content[J],2021,21(24).
APA	Battaglia M.A..,Balasus N..,Ball K..,Caicedo V..,Delgado R..,...&Hennigan C.J..(2021).Urban aerosol chemistry at a land-water transition site during summer - Part 2: Aerosol pH and liquid water content.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(24).
MLA	Battaglia M.A.,et al."Urban aerosol chemistry at a land-water transition site during summer - Part 2: Aerosol pH and liquid water content".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.24(2021).