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DOI	10.5194/acp-22-16003-2022
	Product distribution, kinetics, and aerosol formation from the OH oxidation of dimethyl sulfide under different RO2 regimes
	Ye, Qing; Goss, Matthew B. B.; Krechmer, Jordan E. E.; Majluf, Francesca; Zaytsev, Alexander; Li, Yaowei; Roscioli, Joseph R. R.; Canagaratna, Manjula; Keutsch, Frank N. N.; Heald, Colette L. L.; Kroll, Jesse H. H.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	16003
结束页码	16015
卷号	22 期号:24 页码:13
英文摘要	The atmospheric oxidation of dimethyl sulfide (DMS) represents a major natural source of atmospheric sulfate aerosols. However, there remain large uncertainties in our understanding of the underlying chemistry that governs the product distribution and sulfate yield from DMS oxidation. Here, chamber experiments were conducted to simulate gas-phase OH-initiated oxidation of DMS under a range of reaction conditions. Most importantly, the bimolecular lifetime (tau(bi)) of the peroxy radical CH3SCH2OO was varied over several orders of magnitude, enabling the examination of the role of peroxy radical isomerization reactions on product formation. An array of analytical instruments was used to measure nearly all sulfur-containing species in the reaction mixture, and results were compared with a near-explicit chemical mechanism. When relative humidity was low, sulfur closure was achieved under both high-NO (tau(bi)< 0.1 s) and low-NO (tau(bi)> 10 s) conditions, though product distributions were substantially different in the two cases. Under high-NO conditions, approximately half the product sulfur was in the particle phase, as methane sulfonic acid (MSA) and sulfate, with most of the remainder as SO2 (which in the atmosphere would eventually oxidize to sulfate or be lost to deposition). Under low-NO conditions, hydroperoxymethyl thioformate (HPMTF, HOOCH2SCHO), formed from CH3SCH2OO isomerization, dominates the sulfur budget over the course of the experiment, suppressing or delaying the formation of SO2 and particulate matter. The isomerization rate constant of CH3SCH2OO at 295 K is found to be 0.13 +/- 0.03 s(-1), in broad agreement with other recent laboratory measurements. The rate constants for the OH oxidation of key first-generation oxidation products (HPMTF and methyl thioformate, MTF) were also determined (k(OH+HPMTF)=2.1x10(-11) cm(3) molec.(-1) s(-1), k(OH+MTF)=1.35x10(-11) cm(3) molec.(-1) s(-1)). Product measurements agree reasonably well with mechanistic predictions in terms of total sulfur distribution and concentrations of most individual species, though the mechanism overpredicts sulfate and underpredicts MSA under high-NO conditions. Lastly, results from high-relative-humidity conditions suggest efficient heterogenous loss of at least some gas-phase products.
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:000899534900001
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/273005
作者单位	Massachusetts Institute of Technology (MIT); Aerodyne Research; Harvard University; Aerodyne Research; Harvard University; Harvard University; National Center Atmospheric Research (NCAR) - USA
推荐引用方式 GB/T 7714	Ye, Qing,Goss, Matthew B. B.,Krechmer, Jordan E. E.,et al. Product distribution, kinetics, and aerosol formation from the OH oxidation of dimethyl sulfide under different RO2 regimes[J],2022,22(24):13.
APA	Ye, Qing.,Goss, Matthew B. B..,Krechmer, Jordan E. E..,Majluf, Francesca.,Zaytsev, Alexander.,...&Kroll, Jesse H. H..(2022).Product distribution, kinetics, and aerosol formation from the OH oxidation of dimethyl sulfide under different RO2 regimes.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(24),13.
MLA	Ye, Qing,et al."Product distribution, kinetics, and aerosol formation from the OH oxidation of dimethyl sulfide under different RO2 regimes".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.24(2022):13.