Articles | Volume 24, issue 4
https://doi.org/10.5194/acp-24-2345-2024
https://doi.org/10.5194/acp-24-2345-2024
Research article
 | 
23 Feb 2024
Research article |  | 23 Feb 2024

An updated modeling framework to simulate Los Angeles air quality – Part 1: Model development, evaluation, and source apportionment

Elyse A. Pennington, Yuan Wang, Benjamin C. Schulze, Karl M. Seltzer, Jiani Yang, Bin Zhao, Zhe Jiang, Hongru Shi, Melissa Venecek, Daniel Chau, Benjamin N. Murphy, Christopher M. Kenseth, Ryan X. Ward, Havala O. T. Pye, and John H. Seinfeld

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This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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Subject: Aerosols | Research Activity: Atmospheric Modelling and Data Analysis | Altitude Range: Troposphere | Science Focus: Chemistry (chemical composition and reactions)
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Cited articles

Alapaty, K., Niyogi, D., Chen, F., Pyle, P., Chandrasekar, A., and Seaman, N.: Development of the Flux-Adjusting Surface Data Assimilation System for Mesoscale Models, J. Appl. Meteorol. Clim., 47, 2331–2350, https://doi.org/10.1175/2008JAMC1831.1, 2008. 
Bash, J. O., Baker, K. R., and Beaver, M. R.: Evaluation of improved land use and canopy representation in BEIS v3.61 with biogenic VOC measurements in California, Geosci. Model Dev., 9, 2191–2207, https://doi.org/10.5194/gmd-9-2191-2016, 2016. 
California Air Resources Board: EMFAC2017 Volume III - Technical Documentation, V1.0.2, https://ww2.arb.ca.gov/sites/default/files/2023-01/emfac2017-volume-iii-technical-documentation.pdf (last access: 22 September 2023), 2018. 
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To assess the air quality in Los Angeles (LA), we improved the CMAQ model by using dynamic traffic emissions and new secondary organic aerosol schemes to represent volatile chemical products. Source apportionment demonstrates that the urban areas of the LA Basin and vicinity are NOx-saturated, with the largest sensitivity of O3 to changes in volatile organic compounds in the urban core. The improvement and remaining issues shed light on the future direction of the model development.
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