气候变化领域集成服务门户(CCPortal): Functionality-based formation of secondary organic aerosol from m-xylene photooxidation

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DOI	10.5194/acp-22-9843-2022
	Functionality-based formation of secondary organic aerosol from m-xylene photooxidation
	Li, Yixin; Zhao, Jiayun; Gomez-Hernandez, Mario; Lavallee, Michael; Johnson, Natalie M.; Zhang, Renyi
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	9843
结束页码	9857
卷号	22 期号:15 页码:15
英文摘要	Photooxidation of volatile organic compounds (VOCs) produces condensable oxidized organics (COOs) to yield secondary organic aerosol (SOA), but the fundamental chemical mechanism for gas-to-particle conversion remains uncertain. Here we elucidate the production of COOs and their roles in SOA and brown carbon (BrC) formation from m-xylene oxidation by simultaneously monitoring the evolution of gas-phase products and aerosol properties in an environmental chamber. Four COO types with the distinct functionalities of dicarbonyls, carboxylic acids, polyhydroxy aromatics/quinones, and nitrophenols are identified from early-generation oxidation, with the yields of 25 %, 37 %, 5 %, and 3 %, respectively. SOA formation occurs via several heterogeneous processes, including interfacial interaction, ionic dissociation/acid-base reaction, and oligomerization, with the yields of (20 +/- 4) % and (32 +/- 7) % at 10 % and 70 % relative humidity (RH), respectively. Chemical speciation shows the dominant presence of oligomers, nitrogen-containing organics, and carboxylates at high RH and carboxylates at low RH. The identified BrC includes N-heterocycles/N-heterochains and nitrophenols, as evident from reduced single scattering albedo. The measured uptake coefficient (gamma) for COOs is dependent on the functionality, ranging from 3.7 x 10(-4) to 1.3 x 10(-2). A functionality-based kinetic framework is developed to predict SOA production from the observed concentrations and uptake coefficients for COOs, which reproduces the measurement from m-xylene oxidation. Our results reveal that photochemical oxidation of m-xylene represents a major source for SOA and BrC formation under urban environments, because of its large abundance, high reactivity with OH, and high yields for COOs.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000835272400001
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/273522
作者单位	Texas A&M University System; Texas A&M University College Station; University of California System; University of California Irvine; Texas A&M University System; Texas A&M University College Station; Texas A&M University System; Texas A&M University College Station; Texas A&M Health Science Center
推荐引用方式 GB/T 7714	Li, Yixin,Zhao, Jiayun,Gomez-Hernandez, Mario,et al. Functionality-based formation of secondary organic aerosol from m-xylene photooxidation[J],2022,22(15):15.
APA	Li, Yixin,Zhao, Jiayun,Gomez-Hernandez, Mario,Lavallee, Michael,Johnson, Natalie M.,&Zhang, Renyi.(2022).Functionality-based formation of secondary organic aerosol from m-xylene photooxidation.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(15),15.
MLA	Li, Yixin,et al."Functionality-based formation of secondary organic aerosol from m-xylene photooxidation".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.15(2022):15.