气候变化领域集成服务门户(CCPortal): NOx enhances secondary organic aerosol formation from nighttime γ-terpinene ozonolysis

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DOI	10.1016/j.atmosenv.2020.117375
	NOx enhances secondary organic aerosol formation from nighttime γ-terpinene ozonolysis
	Xu L.; Tsona N.T.; You B.; Zhang Y.; Wang S.; Yang Z.; Xue L.; Du L.
发表日期	2020
ISSN	1352-2310
卷号	225
英文摘要	As an important component of anthropogenic emissions, nitrogen oxides (NOx) are well known to interfere with daytime oxidation of biogenic volatile organic compounds (BVOCs) and secondary organic aerosol (SOA) formation. Nighttime chemistry is highly related to O3 and NOx level but, NOx effects on SOA formation from the ozonolysis of BVOCs, especially polyolefinic monoterpenes, have not been well understood. In the present study, SOA formation from pure and NOx-involved γ-terpinene ozonolysis was studied in a smog chamber under dark conditions. At atmospherically relevant particle mass loading of 10 μg m−3, the SOA yield from pure ozonolysis is estimated by a two-product model to be 8.6%. When NOx were incorporated into γ-terpinene ozonolysis, both the particle size and SOA yields increased simultaneously with elevated NOx mixing ratios. SOA yields doubled (from 0.38 to 0.77) when the system moved from NOx-free to [γ-terpinene]0/[NOx]0 = 3.5 (ppbC/ppb). The characteristic absorption of organic nitrates was detected by Fourier transform infrared (FTIR) spectroscopy and the fraction of organic nitrates increased with increasing NOx mixing ratios. Identification of the new constituents in SOA from NOx-involved γ-terpinene ozonolysis and their formation channels suggest that the formation of organic nitrates follows NO3 chemistry. NOx affects γ-terpinene ozonolysis via the enhanced generation of NO3 at high NOx and its subsequent more favored consumption of γ-terpinene than O3. The first-generation products from NO3 oxidation of γ-terpinene could be further oxidized by ozone, forming more oxidized products that contribute to SOA formation. Our investigation suggests that at night with high NOx levels, γ-terpinene may be a significant source of SOA and organic nitrates through anthropogenic-biogenic interactions. © 2020 Elsevier Ltd
关键词	Anthropogenic-biogenic interactions Nighttime Ozonolysis Secondary organic aerosol γ-Terpinene
语种	英语
scopus关键词	Aerosols; Fourier transform infrared spectroscopy; Mixing; Monoterpenes; Nitrates; Oxidation; Ozone; Particle size; Volatile organic compounds; Anthropogenic emissions; Biogenic volatile organic compounds; Characteristic absorption; Nighttime; Oxidized products; Ozonolysis; Secondary organic aerosols; Terpinene; Nitrogen oxides; nitrate; nitrogen oxide; organic nitrate; ozone; terpinene; absorption; aerosol composition; aerosol formation; biogenic emission; human activity; mixing; nitrogen oxides; organic compound; oxidation; ozone; absorption; Article; darkness; Fourier transform infrared spectroscopy; oxidation; ozonolysis; particle size; priority journal; secondary organic aerosol
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249265
作者单位	Environment Research Institute, Shandong University, Qingdao, 266237, China; School of Life Science, Shandong University, Qingdao, 266237, China
推荐引用方式 GB/T 7714	Xu L.,Tsona N.T.,You B.,et al. NOx enhances secondary organic aerosol formation from nighttime γ-terpinene ozonolysis[J],2020,225.
APA	Xu L..,Tsona N.T..,You B..,Zhang Y..,Wang S..,...&Du L..(2020).NOx enhances secondary organic aerosol formation from nighttime γ-terpinene ozonolysis.ATMOSPHERIC ENVIRONMENT,225.
MLA	Xu L.,et al."NOx enhances secondary organic aerosol formation from nighttime γ-terpinene ozonolysis".ATMOSPHERIC ENVIRONMENT 225(2020).