Articles | Volume 23, issue 17
https://doi.org/10.5194/acp-23-9669-2023
https://doi.org/10.5194/acp-23-9669-2023
Research article
 | 
31 Aug 2023
Research article |  | 31 Aug 2023

Direct observations of NOx emissions over the San Joaquin Valley using airborne flux measurements during RECAP-CA 2021 field campaign

Qindan Zhu, Bryan Place, Eva Y. Pfannerstill, Sha Tong, Huanxin Zhang, Jun Wang, Clara M. Nussbaumer, Paul Wooldridge, Benjamin C. Schulze, Caleb Arata, Anthony Bucholtz, John H. Seinfeld, Allen H. Goldstein, and Ronald C. Cohen

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Cited articles

Almaraz, M., Bai, E., Wang, C., Trousdell, J., Conley, S., Faloona, I., and Houlton, B. Z.: Agriculture is a major source of NOx pollution in California, Science Advances, 4, eaao3477, https://doi.org/10.1126/sciadv.aao3477, 2018. a
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Andreae, M. O. and Schimel, D. S.: Exchange of trace gases between terrestrial ecosystems and the atmosphere, Plant Growth Regul., 10, 383–384, https://doi.org/10.1007/BF00024600, 1990. a
CARB: Heavy-Duty Engine and Vehicle Omnibus Regulation and Associated Amendments, https://ww2.arb.ca.gov/rulemaking/2020/hdomnibuslownox (last access: 22 June 2022), 2016. a
CARB: EMission FACtor (EMFAC), https://arb.ca.gov/emfac/ (last access: 22 June 2022), 2021a. a
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Short summary
Nitrogen oxide (NOx) is a hazardous air pollutant, and it is the precursor of short-lived climate forcers like tropospheric ozone and aerosol particles. While NOx emissions from transportation has been strictly regulated, soil NOx emissions are overlooked. We use the airborne flux measurements to observe NOx emissions from highways and urban and cultivated soil land cover types. We show non-negligible soil NOx emissions, which are significantly underestimated in current model simulations.
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