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GEOCLIM model as it was used for the experiments presented in Maffre, P., Swanson-Hysell, N.L., and Godd\'eris, Y. (2021), Limited carbon cycle response to increased sulfide weathering due to oxygen feedback, ]Geophysical Research Letters, doi:10.1029/2021GL094589. GEOCLIM is cluster of models, more or less adaptable, computing geochemical cycles of several species (C, O...) at geological timescale. The core of the model is an ocean-atmosphere chemistry model (advection-reaction) COMBINE. Ocean an atmosphere are discretized in 10 reservoirs (boxes). This core is closely associated to an early diagenesis module computing the "output" fluxes (burial of elements in marine sediments) for each box. It is also associated to an continental weathering module computing the "input" fluxes. This weathering module is spatially-resolved (using a geographic mesh grid), its resolution is adaptable, and several options exist for the silicate weathering part. This triplet is indirectly coupled to a climate model (GCM). Climate simulations must be run before using GEOCLIM, for a range of CO2 levels. Any climate model can be used, as long as it computes surface air temperature and continental runoff. Oceanic temperature from the climate model can be used, or parameterized if not available. Climate fields are then interpolated on the "CO2 dimension", at the current atmospheric CO2 computed by GEOCLIM, and used to compute continental weathering, and oceanic boxes temperature. The resolution (ie, the spatial grid) of the continental weathering module must be the same than the GCM. How to run the model: After downloading the present repository, type ./make_test testname (testname being one of "ERA5", "GFDL", "CESM", "paleo" and "ascii"). This command will compile and execute a short GEOCLIM run and compare the output to a reference template. This allows to verify that the compilation and execution of the model are performed without error, and yield the same results than reference runs. If not, the command should tell what type of error was encountered (see also section Frequent issues at the end of this file). You could try the 5 tests to make sure everything works as excepted. If the tests are conclusive, follow those step to create your run: Compile the code with build_GEOCLIM (specifying the model set of components and resolution). Try ./build_GEOCLIM --help for more information. This command create an executable file in 'executable/' Configure the run by editing the files 'config/IO_CONDITIONS' and 'config/cond_p20.dat' (name of the run, initial condition, forcing fields, solver parameters...). This post-compilation configuration must be consistent with the specified set of components and resolution. Run the model with executable/exec_name (name of the executable created at the compilation step). Alternatively, and if you are running the model on a cluster, you can use the files in 'job/' to submit the run as a batch process. 'job/submit_chain.sh' is a script designed for submitting a series of runs, each new one starting from the end of the previous one. See also section Multiple runs and job submission in Run GEOCLIM.