Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 19, issue 21
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

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Latest update: 04 Nov 2026
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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.
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