TY - JOUR
T1 - O-3 photochemistry on O-3 episode days and non-O-3 episode days in Wuhan, Central China
AU - Zhu, Jiaxin
AU - Cheng, Hairong
AU - Peng, Jin
AU - Zeng, Pei
AU - Wang, Zuwu
AU - Lyu, Xiaopu
AU - Guo, Hai
PY - 2020/2/15
Y1 - 2020/2/15
N2 - Simultaneous field measurements of ozone (O
3) and its precursors were conducted at an urban site (Zi Yang, ZY) and a suburban site (Huang Pi, HP) in August 2018 in Wuhan, China. The observation results revealed that the mean levels of nitric oxide (NO), nitrogen dioxide (NO
2), carbon monoxide (CO) and non-methane hydrocarbons (NMHCs) were higher at ZY than those detected at HP, while the opposite trend was observed for O
3 levels. Compared to non-O
3 episode days, higher levels of O
3 and its precursors (i.e. NMHCs, NO and CO) were observed on O
3 episode days at both ZY and HP. A chemical box model was used to investigate the O
3 photochemistry on O
3 episode days and non-O
3 episode days at ZY and HP, and the O
3 production was found to be dominated by the reaction of HO
2 + NO at the two sites. In terms of O
3 destruction, OH + NO
2 was the major contributor at ZY, while the highest contribution at HP was from the reaction of O(
1D) + H
2O. The net O
3 production rates increased significantly from non-O
3 episode days to O
3 episode days at both ZY and HP, indicating increased O
3 accumulation on O
3 episode days. In addition, the model simulation indicated that O
3 formation was controlled by volatile organic compounds (VOCs) at ZY, whereas O
3 formation was cooperative controlled by VOCs and NO at HP. Overall, these findings can provide valuable information on formulating and implementing O
3 control strategies in urban and suburban areas in China.
AB - Simultaneous field measurements of ozone (O
3) and its precursors were conducted at an urban site (Zi Yang, ZY) and a suburban site (Huang Pi, HP) in August 2018 in Wuhan, China. The observation results revealed that the mean levels of nitric oxide (NO), nitrogen dioxide (NO
2), carbon monoxide (CO) and non-methane hydrocarbons (NMHCs) were higher at ZY than those detected at HP, while the opposite trend was observed for O
3 levels. Compared to non-O
3 episode days, higher levels of O
3 and its precursors (i.e. NMHCs, NO and CO) were observed on O
3 episode days at both ZY and HP. A chemical box model was used to investigate the O
3 photochemistry on O
3 episode days and non-O
3 episode days at ZY and HP, and the O
3 production was found to be dominated by the reaction of HO
2 + NO at the two sites. In terms of O
3 destruction, OH + NO
2 was the major contributor at ZY, while the highest contribution at HP was from the reaction of O(
1D) + H
2O. The net O
3 production rates increased significantly from non-O
3 episode days to O
3 episode days at both ZY and HP, indicating increased O
3 accumulation on O
3 episode days. In addition, the model simulation indicated that O
3 formation was controlled by volatile organic compounds (VOCs) at ZY, whereas O
3 formation was cooperative controlled by VOCs and NO at HP. Overall, these findings can provide valuable information on formulating and implementing O
3 control strategies in urban and suburban areas in China.
KW - Central China
KW - Diurnal variation
KW - Ozone
KW - Photochemistry
UR - http://www.scopus.com/inward/record.url?scp=85077336726&partnerID=8YFLogxK
U2 - 10.1016/j.atmosenv.2019.117236
DO - 10.1016/j.atmosenv.2019.117236
M3 - Journal article
SN - 1352-2310
VL - 223
JO - Atmospheric Environment
JF - Atmospheric Environment
M1 - 117236
ER -