气候变化领域集成服务门户(CCPortal): Secondary organic aerosols from OH oxidation of cyclic volatile methyl siloxanes as an important Si source in the atmosphere

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DOI	10.5194/acp-22-10827-2022
	Secondary organic aerosols from OH oxidation of cyclic volatile methyl siloxanes as an important Si source in the atmosphere
	Han, Chong; Yang, Hongxing; Li, Kun; Lee, Patrick; Liggio, John; Leithead, Amy; Li, Shao-Meng
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	10827
结束页码	10839
卷号	22 期号:16 页码:13
英文摘要	Cyclic volatile methyl siloxanes (cVMSs), which can volatilize into the atmosphere, are active ingredients in widely used consumer products, thus attracting much attention due to their potential environmental risks. While in the atmosphere the cVMSs undergo oxidation, yielding both gaseous and particulate products. The aerosol yields and compositions from the OH oxidation of four cVMSs (D3-D6) were determined under low- and high-NOx conditions in an oxidation flow reactor. The aerosol yields increased progressively from D3 to D6, consistent with the volatilities and molecule weights of these cVMSs. NOx can restrict the formation of secondary organic aerosols (SOAs), leading to lower SOA yields under high-NOx conditions than under low-NOx conditions, with a yield decrease between 0.05-0.30 depending on the cVMSs Ammonium sulfate seeds exhibited minor impacts on SOA yields under low-NOx conditions but significantly increased the SOA yields in the oxidation of D3-D5 at short photochemical ages under high-NOx conditions. The mass spectra of the SOAs showed a dependence of its chemical compositions on OH exposure. At high exposures equivalent to photochemical ages of >4 d in the atmosphere, D4-D6 SOAs mainly consisted of CxHy and CxHyOzSin under low-NOx conditions, whereas they primarily contained NmOz, CxHy, CxHyO1, CxHyO>1 and CxHyOzSin under high-NOx conditions. The potential contributions of cVMSs to SOA formation in the atmosphere were evaluated using the reported cVMSs annual production and the yield obtained in the present study. A global cVMS-derived (D4-D6) SOA source strength is estimated to be 0.01 Tg yr(-1), distributed over major urban centers.
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:000844705100001
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/273422
作者单位	Northeastern University - China; Environment & Climate Change Canada; Peking University
推荐引用方式 GB/T 7714	Han, Chong,Yang, Hongxing,Li, Kun,et al. Secondary organic aerosols from OH oxidation of cyclic volatile methyl siloxanes as an important Si source in the atmosphere[J],2022,22(16):13.
APA	Han, Chong.,Yang, Hongxing.,Li, Kun.,Lee, Patrick.,Liggio, John.,...&Li, Shao-Meng.(2022).Secondary organic aerosols from OH oxidation of cyclic volatile methyl siloxanes as an important Si source in the atmosphere.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(16),13.
MLA	Han, Chong,et al."Secondary organic aerosols from OH oxidation of cyclic volatile methyl siloxanes as an important Si source in the atmosphere".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.16(2022):13.