TY  - JOUR
AU  - Qu, Hang
AU  - Wang, Yuhang
AU  - Zhang, Ruixiong
AU  - Liu, Xiaoxi
AU  - Huey, Lewis Gregory
AU  - Sjostedt, Steven
AU  - Zeng, Limin
AU  - Lu, Keding
AU  - Wu, Yusheng
AU  - Shao, Min
AU  - Hu, Min
AU  - Tan, Zhaofeng
AU  - Fuchs, Hendrik
AU  - Broch, Sebastian
AU  - Wahner, Andreas
AU  - Zhu, Tong
AU  - Zhang, Yuanhang
TI  - Chemical Production of Oxygenated Volatile Organic Compounds Strongly Enhances Boundary-Layer Oxidation Chemistry and Ozone Production
JO  - Environmental science & technology
VL  - 55
IS  - 20
SN  - 1520-5851
CY  - Columbus, Ohio
PB  - American Chemical Society
M1  - FZJ-2021-04219
SP  - 13718 - 13727
PY  - 2021
AB  - Photolysis 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.
LB  - PUB:(DE-HGF)16
C6  - 34623137
UR  - <Go to ISI:>//WOS:000710453500032
DO  - DOI:10.1021/acs.est.1c04489
UR  - https://juser.fz-juelich.de/record/902385
ER  -