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

Dufour, Gaëlle; Hauglustaine, Didier; Zhang, Yunjiang; Eremenko, Maxim; Cohen, Yann; Gaudel, Audrey; Siour, Guillaume; Lachatre, Mathieu; Bense, Axel; Bessagnet, Bertrand; Cuesta, Juan; Ziemke, Jerry; Thouret, Valérie; Zheng, Bo

doi:https://doi.org/10.5194/acp-21-16001-2021

Articles | Volume 21, issue 20

Atmos. Chem. Phys., 21, 16001–16025, 2021

https://doi.org/10.5194/acp-21-16001-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Atmos. Chem. Phys., 21, 16001–16025, 2021

https://doi.org/10.5194/acp-21-16001-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 20

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.

Data sets

IAGOS time series Damien Boulanger, Ulrich Bundke, Andreas Petzold, Bastien Sauvage, and Valérie Thouret https://doi.org/10.25326/06

Interpol-IAGOS software Yann Cohen, Valérie Thouret, Virgine Marécal, and Béatrice Josse https://doi.org/10.25326/81

French Data and Services for the Atmosphere Cathy Boonne https://www.aeris-data.fr

IASI and LMDZ-OR-INCA O3 partial columns over China from 2008 to 2017 Gaëlle Dufour https://doi.org/10.14768/283b78e9-a4c1-4481-926f-adabdfee8496

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 NO_x 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.