To make the OMIP-BGC simulations, model groups need boundary conditions for atmospheric gas concentrations of CFC-11, CFC-12, SF6, and CO2 as well as carbon isotope ratios (Δ14C and δ13C). These boundary conditions are described in Orr et al. (2017).  To download them, click on the links below.


Boundary conditions:

  • For CFC-11, CFC-12, and SF6, atmospheric boundary conditions are provided by Bullister et al. (2016) as a CDIAC repository 
  • Atmospheric CO2 is from the supplement of Meinshausen et al. (2017) 
  • Atmospheric Δ14C and δ13C records are those constructed by Heather Graven for C4MIP and OMIP-BGC. Their permanent home is at input4MIPS. To find these 2 files, once on the input4MIPS page, type "OMIP" in the "Search and Download Data" box on the right, then click "Go". 



Bullister, J.: Atmospheric Histories (1765–2015) for CFC-11, CFC-12, CFC-113, CCl4, SF6 and N2O, Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, Tennessee,,, 2015.

Orr, J. C., Najjar, R. G., Aumont, O., Bopp, L., Bullister, J. L., Danabasoglu, G., Doney, S. C., Dunne, J. P., Dutay, J.-C., Graven, H., Griffies, S. M., John, J. G., Joos, F., Levin, I., Lindsay, K., Matear, R. J., McKinley, G. A., Mouchet, A., Oschlies, A., Romanou, A., Schlitzer, R., Tagliabue, A., Tanhua, T., and Yool, A.: Biogeochemical protocols and diagnostics for the CMIP6 Ocean Model Intercomparison Project (OMIP), Geosci. Model Dev., 10, 2169-2199,, 2017.

Jones, 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.

Meinshausen, M., Vogel, E., Nauels, A., Lorbacher, K., Meinshausen, N., Etheridge, D. M., Fraser, P. J., Montzka, S. A., Rayner, P. J., Trudinger, C. M., Krummel, P. B., Beyerle, U., Canadell, J. G., Daniel, J. S., Enting, I. G., Law, R. M., Lunder, C. R., O'Doherty, S., Prinn, R. G., Reimann, S., Rubino, M., Velders, G. J. M., Vollmer, M. K., Wang, R. H. J., and Weiss, R.: Historical greenhouse gas concentrations for climate modelling (CMIP6), Geosci. Model Dev., 10, 2057-2116, doi:10.5194/gmd-10-2057-2017, 2017.