Articles | Volume 21, issue 20
Atmos. Chem. Phys., 21, 16001–16025, 2021
https://doi.org/10.5194/acp-21-16001-2021
Atmos. Chem. Phys., 21, 16001–16025, 2021
https://doi.org/10.5194/acp-21-16001-2021
Research article
28 Oct 2021
Research article | 28 Oct 2021

Recent ozone trends in the Chinese free troposphere: role of the local emission reductions and meteorology

Gaëlle Dufour et al.

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Short summary
The IASI observations and the LMDZ-OR-INCA model simulations show negative ozone trends in the Central East China region in the lower free (3–6 km column) and the upper free (6–9 km column) troposphere. Sensitivity studies from the model show that the Chinese anthropogenic emissions contribute to more than 50 % in the trend. The reduction in NOx emissions that has occurred since 2013 in China seems to lead to a decrease in ozone in the free troposphere, contrary to the increase at the surface.
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