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Environ Sci Technol

Title:		Chemical Production of Oxygenated Volatile Organic Compounds Strongly Enhances Boundary-Layer Oxidation Chemistry and Ozone Production
Author(s):		Qu H; Wang Y; Zhang R; Liu X; Huey LG; Sjostedt S; Zeng L; Lu K; Wu Y; Shao M; Hu M; Tan Z; Fuchs H; Broch S; Wahner A; Zhu T; Zhang Y;
Address:		"School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Boulder, Colorado 80309, United States. Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado 80305, United States. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China. Institute of Energy and Climate Research, IEK-8: Troposphere, Forschungszentrum Julich GmbH, Julich 52425, Germany"
Journal Title:		Environ Sci Technol
Year:		2021
Volume:		20211008
Issue:		20
Page Number:		13718 - 13727
DOI:		10.1021/acs.est.1c04489
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Photolysis of oxygenated volatile organic compounds (OVOCs) produces a primary source of free radicals, including OH and inorganic and organic peroxy radicals (HO(2) and RO(2)), consequently increasing photochemical ozone production. The amplification of radical cycling through OVOC photolysis provides an important positive feedback mechanism to accelerate ozone production. The large production of OVOCs near the surface helps promote photochemistry in the whole boundary layer. This amplifier effect is most significant in regions with high nitrogen oxides (NO(x)) and VOC concentrations such as Wangdu, China. Using a 1-D model with comprehensive observations at Wangdu and the Master Chemical Mechanism (MCM), we find that OVOC photolysis is the largest free-radical source in the boundary layer (46%). The condensed chemistry mechanism we used severely underestimates the OVOC amplifier effect in the boundary layer, resulting in a lower ozone production rate sensitivity to NO(x) emissions. Due to this underestimation, the model-simulated threshold NO(x) emission value, below which ozone production decreases with NO(x) emission decrease, is biased low by 24%. The underestimated OVOC amplifier effect in a condensed mechanism implies a low bias in the current 3-D model-estimated efficacy of NO(x) emission reduction on controlling ozone in polluted urban and suburban regions of China"
Keywords:		*Air Pollutants/analysis Environmental Monitoring Nitrogen Oxides/analysis *Ozone/analysis *Volatile Organic Compounds/analysis chemical mechanism organic peroxy radicals oxygenated volatile organic compounds ozone photochemistry;
Notes:		"MedlineQu, Hang Wang, Yuhang Zhang, Ruixiong Liu, Xiaoxi Huey, Lewis Gregory Sjostedt, Steven Zeng, Limin Lu, Keding Wu, Yusheng Shao, Min Hu, Min Tan, Zhaofeng Fuchs, Hendrik Broch, Sebastian Wahner, Andreas Zhu, Tong Zhang, Yuanhang eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2021/10/09 Environ Sci Technol. 2021 Oct 19; 55(20):13718-13727. doi: 10.1021/acs.est.1c04489. Epub 2021 Oct 8"