Home

AtChem2 is a modelling software designed to build and run atmospheric chemistry box-models using the Master Chemical Mechanism (MCM). It can also be used with other chemical mechanisms, as long as they are provided in the FACSIMILE format (see 2.1 Chemical Mechanism).

AtChem2 was developed from AtChem-online (https://atchem.leeds.ac.uk/webapp/) with the objective to create a software able to run large atmospheric chemistry models. AtChem-online is a web tool developed at the University of Leeds as part of the EUROCHAMP project. It was designed to facilitate the use of the MCM in the simulation of environmental chamber experiments. A tutorial for AtChem-online, with examples and exercises, is available on the MCM website. A help page with detailed instructions and description of the model parameters and variables is available here.

---

The latest stable version of Atchem2 can be found at the releases page. The development version can be downloaded from the master branch or obtained via git. To install and run AtChem2 follow the instructions on the installation and dependencies pages.

AtChem2 is open source, under MIT license. For instructions on how to cite the model in publications, see the CITATION.md file. The contributors and funders of AtChem-online and AtChem2 are listed in the credits page.

Bug reports, suggestions and contributions are welcome. In order to contribute to the model development, please follow the instructions in the corresponding wiki page.