Articles | Volume 16, issue 21
Development and technical paper
08 Nov 2023
Development and technical paper |  | 08 Nov 2023

Rapid O3 assimilations – Part 1: Background and local contributions to tropospheric O3 changes in China in 2015–2020

Rui Zhu, Zhaojun Tang, Xiaokang Chen, Xiong Liu, and Zhe Jiang

Model code and software

KPP module for tagged-O3 simulation Zhe Jiang

GEOS-Chem, Version 12.8.1 The International GEOS-Chem User Community

Short summary
A single ozone (O3) tracer mode was developed in this work to build the capability of the GEOS-Chem model for rapid O3 simulation. It is combined with OMI and surface O3 observations to investigate the changes in tropospheric O3 in China in 2015–2020. The assimilations indicate rapid surface O3 increases that are underestimated by the a priori simulations. We find stronger increases in tropospheric O3 columns over polluted areas and a large discrepancy by assimilating different observations.