气候变化领域集成服务门户(CCPortal): Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer

CCPortal

DOI	10.1029/2019JD031583
	Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer
	Zaveri R.A.; Shilling J.E.; Fast J.D.; Springston S.R.
发表日期	2020
ISSN	2169897X
卷号	125 期号:6
英文摘要	Organic nitrates formed from nighttime reaction between anthropogenic nitrate radicals (NO3) and biogenic volatile organic compounds (BVOCs) are an important but highly uncertain source of secondary organic aerosol (SOA). Here we report on the enhanced nighttime biogenic SOA formation observed in a polluted residual layer over Sacramento, California, the morning of 15 June 2010 during the Carbonaceous Aerosols and Radiative Effects Study (CARES). Trajectory analysis showed that the residual layer air, containing isoprene and trace amounts of monoterpenes left over after nighttime oxidation, was influenced by the San Francisco Bay Area emissions the previous evening. The residual layer aerosol was also enriched in nitrate, with about 64% of it estimated to be in the form of organic nitrates. The nitrate:organic mass ratio of the SOA was about 0.47 ± 0.044, which corresponds to the range typically found in isoprene mononitrates. Assuming the SOA was composed of organic mononitrates, its nominal molecular weight was estimated at 186 ± 11 g mol−1, consistent with the highly functionalized isoprene hydroxynitrates that have been observed in the particle phase in the southeast United States. Overall, our findings show that the efficiency of nighttime biogenic SOA formation, expressed as the change in organic aerosol mass relative to carbon monoxide (∆OA/∆CO), equals ~100 μg m−3 ppmv and is comparable to the range previously estimated for enhanced daytime SOA formation from mixed anthropogenic and biogenic emissions during CARES. Assuming the SOA was formed from isoprene oxidation by NO3, we estimated mass yields of up to 0.55, consistent with previous field estimates. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	biogenic volatile organic compounds; nighttime secondary organic aerosol; organic nitrates; residual layer; urban pollution
语种	英语
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/186093
作者单位	Atmospheric Sciences & Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States; Environmental Sciences Department, Brookhaven National Laboratory, Upton, NY, United States
推荐引用方式 GB/T 7714	Zaveri R.A.,Shilling J.E.,Fast J.D.,et al. Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer[J],2020,125(6).
APA	Zaveri R.A.,Shilling J.E.,Fast J.D.,&Springston S.R..(2020).Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer.Journal of Geophysical Research: Atmospheres,125(6).
MLA	Zaveri R.A.,et al."Efficient Nighttime Biogenic SOA Formation in a Polluted Residual Layer".Journal of Geophysical Research: Atmospheres 125.6(2020).