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

Data sets

IAGOS time series Damien Boulanger, Ulrich Bundke, Andreas Petzold, Bastien Sauvage, and Valérie Thouret

Interpol-IAGOS software Yann Cohen, Valérie Thouret, Virgine Marécal, and Béatrice Josse

French Data and Services for the Atmosphere Cathy Boonne

IASI and LMDZ-OR-INCA O3 partial columns over China from 2008 to 2017 Gaëlle Dufour

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.
Final-revised paper