For details of experimental protocol, see paper:

Opens external link in new windowJones, C. D., Arora, V., Friedlingstein, P., Bopp, L., Brovkin, V., Dunne, J., Graven, H., Hoffman, F., Ilyina, T., John, J. G., Jung, M., Kawamiya, M., Koven, C., Pongratz, J., Raddatz, T., Randerson, J. T., and Zaehle, S.: C4MIP – The Coupled Climate–Carbon Cycle Model Intercomparison Project: experimental protocol for CMIP6, Geosci. Model Dev., 9, 2853-2880, doi:10.5194/gmd-9-2853-2016, 2016.

Data Use:

CMIP model data are made freely available to the public and the scientific community in the belief that their wide dissemination will lead to greater understanding and new scientific insights. The data are published and freely available on the Earth System Grid (ESGF: ). The Earth System Modelling community makes the following fair use request to ensure that scientists receive fair credit for their work. Data can be freely used in analyses, but in the event of this leading to publication in a journal users are requested to consider if co-authorship from model groups may be appropriate. If the CMIP data are essential to the work, or if an important result or conclusion depends on them, users are encouraged to contact model group representatives and invite possible involvement in any resulting publications. This fair-use request is not intended to be restrictive, but rather to encourage inclusivity and provide a mechanism for scientists to receive due credit for many years of effort building and configuring complex modelling systems.

Simulation Status and Analysis Plans:

Analysis of C4MIP simulations is open to all. Here we try to coordinate analysis to avoid duplication and to foster collaboration. Please add details of planned analysis to the following document:

Modelling groups are requested to keep track of simulation status via the following link:

Forcings for simulations:

The historical carbon isotope forcing datasets are described in a GMD paper (Graven et al. 2017) and they are available as a supplement to the paper, as well as through input4mips.
GMD paper: 
delta13CO2 data:
Delta14CO2 data:

  • Fossil fuel emissions

CMIP6 landcover change emission data

Models without explicit treatment of landuse changes are encouraged to use the following emission data:

Initiates file   (31 MB)


 Initiates file download

Figure 1 from Jones et al 2016, click image to enlarge.

Category Type of Scenario Emission or concentration driven Coupling mode Simulation years Short name
Tier 1
1%BGC Idealised 1% per year CO2 only, BGC mode C-driven CO2 affects BGC 140 1pctCO2-bgc
SSP5-8.5 SSP5-8.5 up to 2100 E-driven Fully coupled 85 esm-ssp585
Tier 2
1%RAD Idealised 1% per year CO2 only, RAD mode C-driven CO2 affects RAD 140 1pctCO2-rad
1%COU-Ndep Idealised 1% per year CO2 only, fully coupled, increasing N-deposition C-driven Fully coupled 140 1pctCO2Ndep
1%BGC-Ndep Idealised 1% per year CO2 only, BGC mode, increasing N-deposition C-driven CO2 affects BGC 140 1pctCO2Ndepbgc
Hist/SSP5-8.5-BGC Historical+SSP5-8.5 up to 2300, BGC mode C-driven CO2 affects BGC i. 165 ii. 85 iii. 200 hist-bgc, ssp585-bgc and ssp585-bgcExt
SSP5-3.4-Overshoot-BGC SSP5-3.4-OS up to 2300 in BGC mode C-driven CO2 affects BGC i. 60 (from 2040-2100)ii. 200 ssp534-over-bgc, ssp534-overbgcExt

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