Articles | Volume 25, issue 7
https://doi.org/10.5194/acp-25-4291-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-25-4291-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Apr 2025
Research article |
| 15 Apr 2025
| 15 Apr 2025
Local and transboundary contributions to NOy loadings across East Asia using CMAQ-ISAM and a GEMS-informed emission inventory during the winter–spring transition
Jincheol Park
Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA
Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA
Sagun Kayastha
Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX, USA
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Short summary
We investigated NOx emission contributions to NOy loadings across five regions of East Asia during the 2022 winter–spring transition through chemical transport modeling informed by satellite data. As seasons progress, local contributions within each region to its NOy budget decreased from 32 %–43 % to 23 %–30 %, while transboundary contributions increased from 16 %–33 % to 27 %–37 %, driven by a shift in synoptic settings that allowed pollutants to spread more broadly across the regions.
We investigated NOx emission contributions to NOy loadings across five regions of East Asia...
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