Changing ozone sensitivity in the South Coast Air Basin during the COVID-19 period

Schroeder, Jason R.; Cai, Chenxia; Xu, Jin; Ridley, David; Lu, Jin; Bui, Nancy; Yan, Fang; Avise, Jeremy

doi:https://doi.org/10.5194/acp-22-12985-2022

Articles | Volume 22, issue 19

https://doi.org/10.5194/acp-22-12985-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-22-12985-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 19

Research article

|

10 Oct 2022

Research article |

| 10 Oct 2022

Changing ozone sensitivity in the South Coast Air Basin during the COVID-19 period

Jason R. Schroeder, Chenxia Cai, Jin Xu, David Ridley, Jin Lu, Nancy Bui, Fang Yan, and Jeremy Avise

Supplement

https://doi.org/10.5194/acp-22-12985-2022-supplement

Data sets

OMI/Aura Nitrogen Dioxide (NO2) Total and Tropospheric Column 1-orbit L2 Swath 13x24 km V003 Nickolay A. Krotkov, Lok N. Lamsal, Sergey V. Marchenko, Eric J.Bucsela, William H. Swartz, Joanna Joiner, and the OMI core team https://doi.org/10.5067/Aura/OMI/DATA2017

OMI/Aura Formaldehyde (HCHO) Total Column 1-orbit L2 Swath 13x24 km V003 Kelly Chance https://doi.org/10.5067/Aura/OMI/DATA2015

OMI/Aura NO2 Tropospheric, Stratospheric & Total Columns MINDS 1-Orbit L2 Swath 13 km x 24 km Lok N. Lamsal, Nickolay A. Krotkov, Sergey V. Marchenko, Joanna Joiner, Luke Oman, Alexander Vasilkov, Bradford Fisher, Wenhan Qin, Eun-Su Yang, Zachary Fasnacht, Sungyeon Choi, Peter Leonard, and David Haffner https://doi.org/10.5067/MEASURES/MINDS/DATA201

TROPOMI Level 2 Formaldehyde Total Column products Copernicus Sentinel-5P https://doi.org/10.5270/S5P-tjlxfd2

Model code and software

CMAQ (Community Multiscale Air Quality Model) U.S. EPA (U.S. Environmental Protection Agency) https://github.com/USEPA/CMAQ

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Short summary

Ozone, a key component of smog, has plagued the Los Angeles (LA) region for decades. Ozone is created by complex chemical reactions that can be greatly impacted by anthropogenic emissions. This study makes use of the COVID-19 period to study the sensitivity of ozone chemistry in LA to certain anthropogenic emissions, notably from vehicles. We find that vehicular emissions of key pollutants dropped by up to 25 % during COVID-19, which caused a fundamental shift in ozone chemistry in the region.