Code is provided for the AGAGE 12-box model of the atmosphere, originally developed by Cunnold et al. (2002). The model includes 4 boxes in the latitudinal direction and 3 vertical layers, representing the lower troposphere, upper troposphere and stratosphere. The code accounts for atmospheric loss of trace gases due to e.g. OH oxidation. The code submitted here includes the adjoint model and two solving algorithms (described in Thompson et al. 2018) and is written in Fortran90. This specific version was used for the optimisation of the atmospheric hydroxyl (OH) oxidation capacity using multiple hydrofluorocarbons (HFCs). The code simultaneously optimises OH and the emissions of three trace gases (HFCs). Also provided are the default parameters needed to run the model.

{"references": ["Cunnold et al. (2002), J. Geophys. Res., 107, 4225", "Thompson et al. (2018), Geophys. Res. Lett., 112, D04306-10"]}