Preprints
https://doi.org/10.5194/egusphere-2024-3201
https://doi.org/10.5194/egusphere-2024-3201
25 Nov 2024
 | 25 Nov 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Significant influence of oxygenated volatile organic compounds on atmospheric chemistry analysis: A case study in a typical industrial city in China

Jingwen Dai, Kun Zhang, Yanli Feng, Xin Yi, Rui Li, Jin Xue, Qing Li, Lishu Shi, Jiaqiang Liao, Yanan Yi, Fangting Wang, Liumei Yang, Hui Chen, Ling Huang, Jiani Tan, Yangjun Wang, and Li Li

Abstract. Oxygenated volatile organic compounds (OVOCs), key components of volatile organic compounds (VOCs), are either directly emitted or secondary generated via photochemical processes, and play a crucial role in tropospheric photochemistry and act as important ozone (O3) precursors. However, due to measurement limitations, the influence of OVOCs on O3 formation has often been underestimated. In this study, 74 VOCs (including 18 OVOCs) were measured at five representative stations in Zibo, an industrial city in the North China Plain. The VOCs level in Zibo (44.6±20.9 ppb) is in the upper-middle range compared with previous studies, with OVOCs contributing 30.0 %~37.8 % to the total VOCs concentration. The overall O3 formation potential in Zibo is 410.4±197.2 µg m-3, with OVOCs being the dominant contributor (31.5 %~55.9 %). An observation-based model (OBM) was used to access the contributions of chemical production (RNetProd) and emissions/transport (REmis&Trans) to individual OVOC. Daytime RNetProd is the highest at the urban site (5.9 ppb h-1), while nighttime REmis&Trans is most significantly negative at the industrial site (0.76 ppb h-1). Simulations without OVOCs constraint overestimates OVOCs (42.1 %~126.5 %) and key free radicals (e.g., HO2 (5.3 %~20.4 %) and RO2 (6.6 %~35.1 %)), leading to a 1.8 %~11.9 % overestimation of O3. This overestimation causes an underestimation of OH (1.8 %~20.9 %) and atmospheric oxidizing capacity (3.5 %~12.5 %). These findings emphasize the importance of comprehensive OVOCs measurements to constrain numerical models, especially in regions with dense anthropogenic emissions, to better reproduce atmospheric photochemistry, and to formulate more effective air pollution control strategies.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Jingwen Dai, Kun Zhang, Yanli Feng, Xin Yi, Rui Li, Jin Xue, Qing Li, Lishu Shi, Jiaqiang Liao, Yanan Yi, Fangting Wang, Liumei Yang, Hui Chen, Ling Huang, Jiani Tan, Yangjun Wang, and Li Li

Status: open (until 06 Jan 2025)

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Jingwen Dai, Kun Zhang, Yanli Feng, Xin Yi, Rui Li, Jin Xue, Qing Li, Lishu Shi, Jiaqiang Liao, Yanan Yi, Fangting Wang, Liumei Yang, Hui Chen, Ling Huang, Jiani Tan, Yangjun Wang, and Li Li
Jingwen Dai, Kun Zhang, Yanli Feng, Xin Yi, Rui Li, Jin Xue, Qing Li, Lishu Shi, Jiaqiang Liao, Yanan Yi, Fangting Wang, Liumei Yang, Hui Chen, Ling Huang, Jiani Tan, Yangjun Wang, and Li Li

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Short summary
Oxygenated volatile organic compounds (OVOCs) are important ozone (O3) precursors. However, most of O3 formation analysis based on the box model (OBM) don't include OVOCs constraint To access the interference of OVOCs on O3 simulation, this study conducted field campaign and OBM analysis. The results indicates that no OVOCs constraint in the OBM can lead to overestimate of OVOCs, free radicals, and O3.