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000902385 1001_ $$00000-0002-2924-2826$$aQu, Hang$$b0
000902385 245__ $$aChemical Production of Oxygenated Volatile Organic Compounds Strongly Enhances Boundary-Layer Oxidation Chemistry and Ozone Production
000902385 260__ $$aColumbus, Ohio$$bAmerican Chemical Society$$c2021
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000902385 520__ $$aPhotolysis of oxygenated volatile organic compounds (OVOCs) produces a primary source of free radicals, including OH and inorganic and organic peroxy radicals (HO2 and RO2), 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 (NOx) 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 NOx emissions. Due to this underestimation, the model-simulated threshold NOx emission value, below which ozone production decreases with NOx 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 NOx emission reduction on controlling ozone in polluted urban and suburban regions of China.
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000902385 7001_ $$00000-0002-7290-2551$$aWang, Yuhang$$b1$$eCorresponding author
000902385 7001_ $$0P:(DE-HGF)0$$aZhang, Ruixiong$$b2
000902385 7001_ $$0P:(DE-HGF)0$$aLiu, Xiaoxi$$b3
000902385 7001_ $$00000-0002-0518-7690$$aHuey, Lewis Gregory$$b4
000902385 7001_ $$0P:(DE-HGF)0$$aSjostedt, Steven$$b5
000902385 7001_ $$0P:(DE-HGF)0$$aZeng, Limin$$b6
000902385 7001_ $$0P:(DE-Juel1)6776$$aLu, Keding$$b7
000902385 7001_ $$0P:(DE-HGF)0$$aWu, Yusheng$$b8
000902385 7001_ $$0P:(DE-HGF)0$$aShao, Min$$b9
000902385 7001_ $$00000-0003-4816-9123$$aHu, Min$$b10
000902385 7001_ $$0P:(DE-Juel1)173726$$aTan, Zhaofeng$$b11
000902385 7001_ $$0P:(DE-Juel1)7363$$aFuchs, Hendrik$$b12
000902385 7001_ $$0P:(DE-Juel1)7591$$aBroch, Sebastian$$b13
000902385 7001_ $$0P:(DE-Juel1)16324$$aWahner, Andreas$$b14
000902385 7001_ $$00000-0002-2752-7924$$aZhu, Tong$$b15
000902385 7001_ $$0P:(DE-HGF)0$$aZhang, Yuanhang$$b16
000902385 773__ $$0PERI:(DE-600)1465132-4$$a10.1021/acs.est.1c04489$$gVol. 55, no. 20, p. 13718 - 13727$$n20$$p13718 - 13727$$tEnvironmental science & technology$$v55$$x1520-5851$$y2021
000902385 8564_ $$uhttps://juser.fz-juelich.de/record/902385/files/Qu_etal_2021_acceptedVersion.pdf$$yPublished on 2021-10-08. Available in OpenAccess from 2022-10-08.
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