Minor update of AtChem2 v1.2. The main changes include:

• implementation of continuous integration on GitHub Actions
• begin implementation of the new testsuite, with improved reporting of the results
• update installation, plotting and build scripts
• fix a minor bug involving constant photolysis rates
• upgrade the openlibm and numdiff dependencies

See CHANGELOG.md for a detailed list of changes.

Minor update of AtChem2 v1.2. The main changes include:

• fixes a bug with gfortran (version 9 and above)
• adds a new environment variable (aerosol surface area, ASA).

See CHANGELOG.md for a detailed list of changes.

Major update of AtChem2. The main changes include:

• implementation of the dilution mechanism (redefines the DILUTE variable)
• implementation of the argument parser for the executable
• pre-compilation of the chemical mechanism into a shared library
• new manual in pdf format

See CHANGELOG.md for a detailed list of changes.

Minor update of AtChem2 v1.1: includes the documentation (a copy of the wiki pages) in the doc/ directory.

See CHANGELOG.md for a detailed list of changes.

Major update of AtChem2. The main changes include:

• improvements and bug fixes to the calculations of dates/times, and photolysis rates
• improved numerical precision
• implementation of a new directory structure
• implementation of a unit testing framework

See CHANGELOG.md for a detailed list of changes.

First stable release of the atmospheric chemistry box-model AtChem2.

Developed from AtChem-online rev.146 (https://atchem.leeds.ac.uk/sources/).

This version is linked to the GMD paper (https://doi.org/10.5194/gmd-13-169-2020).