GECKO-A v1.0: exploring VOC oxidation trajectories through comparison with the master chemical mechanism

Aumont, Bernard; Valorso, Richard; Rickard, Andrew; Jenkin, Mike; Lee-Taylor, Julia; Orlando, John; Madronich, Sasha; Vereecken, Luc; Camredon, Marie

doi:10.5194/gmd-19-10395-2026

Articles | Volume 19, issue 21

https://doi.org/10.5194/gmd-19-10395-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gmd-19-10395-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 21

Model description paper

|

04 Nov 2026

Model description paper |

| 04 Nov 2026

GECKO-A v1.0: exploring VOC oxidation trajectories through comparison with the master chemical mechanism

Bernard Aumont, Richard Valorso, Andrew Rickard, Mike Jenkin, Julia Lee-Taylor, John Orlando, Sasha Madronich, Luc Vereecken, and Marie Camredon

Supplement

https://doi.org/10.5194/gmd-19-10395-2026-supplement

Data sets

Data for "GECKO-A v1.0: Exploring VOC Oxidation Trajectories Through Comparison with the MCM'' Bernard Aumont et al. https://doi.org/10.5281/zenodo.23034925

Model code and software

GECKO-A: Generator for Explicit Chemistry and Kinetics of Organics in the Atmosphere Bernard Aumont et al. https://doi.org/10.5281/zenodo.15309905

Box Model for GECKO-A Bernard Aumont et al. https://doi.org/10.5281/zenodo.15310153

Short summary

This study presents the first open-source release of a tool that automatically generates chemical mechanisms for the atmospheric oxidation of organic compounds. Simulations for five hydrocarbons, under conditions ranging from urban to remote, are compared with a benchmark mechanism. Results show that describing successive oxidation steps is key to simulating the formation of low-volatility and water-soluble species important for aerosols. A reduced mechanism reproduces most of these results.