A better representation of volatile organic compound chemistry in WRF-Chem and its impact on ozone over Los Angeles

作者：Qindan Zhu, Rebecca H. Schwantes, Matthew M. Coggon, Colin Harkins, Jordan Schnell, Jian He, Havala O. T. Pye, Meng Li, Barry Baker, Zachary Moon, Ravan Ahmadov, Eva Y. Pfannerstill, Bryan Place, P. J. Wooldridge, Benjamin C. Schulze, Caleb Arata, Anthony Bucholtz, John H. Seinfeld, C. Warneke, Chelsea E. Stockwell, Lu Xu, Kristen Zuraski, Michael Robinson, J. A. Neuman, Patrick R. Veres, Jeff Peischl, Steven S. Brown, Allen H. Goldstein, R. C. Cohen, Brian McDonald · 发表于：Atmospheric chemistry and physics · 年份：2024 · DOI：10.5194/acp-24-5265-2024 · 被引用次数：20 · 研究领域：Atmospheric chemistry and aerosols、Atmospheric Ozone and Climate、Air Quality and Health Impacts

Abstract. The declining trend in vehicle emissions has underscored the growing significance of volatile organic compound (VOC) emissions from volatile chemical products (VCPs). However, accurately representing VOC chemistry in simplified chemical mechanisms remains challenging due to its chemical complexity including speciation and reactivity. Previous studies have predominantly focused on VOCs from fossil fuel sources, leading to an underrepresentation of VOC chemistry from VCP sources. We developed an integrated chemical mechanism, RACM2B-VCP, that is compatible with WRF-Chem and is aimed at enhancing the representation of VOC chemistry, particularly from VCP sources, within the present urban environment. Evaluation against the Air Quality System (AQS) network data demonstrates that our model configured with RACM2B-VCP reproduces both the magnitude and spatial variability of O3 and PM2.5 in Los Angeles. Furthermore, evaluation against comprehensive measurements of O3 and PM2.5 precursors from the Reevaluating the Chemistry of Air Pollutants in California (RECAP-CA) airborne campaign and the Southwest Urban NOx and VOC Experiment (SUNVEx) ground site and mobile laboratory campaign confirm the model's accuracy in representing NOx and many VOCs and highlight remaining biases. Although there exists an underprediction in the total VOC reactivity of observed VOC species, our model with RACM2B-VCP exhibits good agreement for VOC markers emitted from different sectors, including bi...