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DOI	10.5194/acp-20-11607-2020
	Differences in fine particle chemical composition on clear and cloudy days
	Christiansen A.E.; Carlton A.G.; Henderson B.H.
发表日期	2020
ISSN	1680-7316
起始页码	11607
结束页码	11624
卷号	20 期号:19
英文摘要	Clouds are prevalent and alter fine particulate matter (PM2.5) mass and chemical composition. Cloud-affected satellite retrievals are subject to higher uncertainty and are often removed from data products, hindering quantitative estimates of tropospheric chemical composition during cloudy times. We examine surface PM2.5 chemical constituent concentrations in the Interagency Monitoring of PROtected Visual Environments (IMPROVE) network in the United States during cloudy and clear-sky times defined using Moderate Resolution Imaging Spectroradiometer (MODIS) cloud flags from 2010 to 2014 with a focus on differences in particle species that affect hygroscopicity and aerosol liquid water (ALW). Cloudy and clear-sky periods exhibit significant differences in PM2.5 mass and chemical composition that vary regionally and seasonally. In the eastern US, relative humidity alone cannot explain differences in ALW, suggesting that emissions and in situ chemistry related to anthropogenic sources exert determining impacts. An implicit clear-sky bias may hinder efforts to quantitatively understand and improve representation of aerosol–cloud interactions, which remain dominant uncertainties in models. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; anthropogenic source; atmospheric chemistry; chemical composition; cloud cover; MODIS; particulate matter; relative humidity; troposphere; 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/247480
作者单位	Department of Chemistry, University of California, Irvine, CA 92697, United States; Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, NC 27709, United States
推荐引用方式 GB/T 7714	Christiansen A.E.,Carlton A.G.,Henderson B.H.. Differences in fine particle chemical composition on clear and cloudy days[J],2020,20(19).
APA	Christiansen A.E.,Carlton A.G.,&Henderson B.H..(2020).Differences in fine particle chemical composition on clear and cloudy days.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(19).
MLA	Christiansen A.E.,et al."Differences in fine particle chemical composition on clear and cloudy days".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.19(2020).