Impact of improved representation of volatile organic compound emissions and production of NO x reservoirs on modeled urban ozone production

作者：Katherine R. Travis, Benjamin A. Nault, J. H. Crawford, Kelvin H. Bates, D. R. Blake, R. C. Cohen, Alan Fried, Samuel R. Hall, L. G. Huey, Young Ro Lee, Simone Meinardi, K.‐E. Min, Isobel J. Simpson, Kirk Ullman · 发表于：Atmospheric chemistry and physics · 年份：2024 · DOI：10.5194/acp-24-9555-2024 · 被引用次数：15 · 研究领域：Atmospheric chemistry and aerosols、Air Quality and Health Impacts、Vehicle emissions and performance

Abstract. The fraction of urban volatile organic compound (VOC) emissions attributable to fossil fuel combustion has been declining in many parts of the world, resulting in a need to better constrain other anthropogenic sources of these emissions. During the National Institute of Environmental Research (NIER) and National Aeronautics and Space Administration (NASA) Korea-United States Air Quality (KORUS-AQ) field study in Seoul, South Korea, during May–June 2016, air quality models underestimated ozone, formaldehyde, and peroxyacetyl nitrate (PAN), indicating an underestimate of VOCs in the emissions inventory. Here, we use aircraft observations interpreted with the GEOS-Chem chemical transport model (version 13.4.0) to assess the need for increases in VOC emissions and for a revised chemical mechanism to improve treatment of VOC speciation and chemistry. We find that the largest needed VOC emissions increases are attributable to compounds associated with volatile chemical products, liquefied petroleum gas (LPG) and natural gas emissions, and long-range transport. Revising model chemistry to better match observed VOC speciation together with increasing model emissions of underestimated VOC species increased calculated OH reactivity by +2 s−1 and ozone production by +2 ppb h−1. Ozone increased by +6 ppb below 2 km and +9 ppb at the surface, and formaldehyde and acetaldehyde increased by +30 % and +120 % aloft, respectively, all in better agreement with observations. The larger...