Input data set: Atmospheric composition (ISIMIP3b)

Climate related forcing: Globally averaged co2 and ch4 annual data. Covering the periods 1850-2014 (historical, picontrol) and 2015-2100 (ssp126, ssp370, ssp585)

The CO₂ concentrations for 1850-2005 were extracted from Meinshausen et al. (2011), while years 2006-2014 were filled with data from the ESRL Global Monitoring Laboratory website. The picontrol time series holds the historical 1850 value of 284.73ppm for the full period. For future simulations, the concentrations were extracted from Meinshausen et al. (2020) where ssp126 relates to RCP2.6, ssp370 to RCP7.0 and ssp585 to RCP8.5, respectively.

The CH₄ data have been extracted for the years until 2014 from Meinshausen et al. (2017), while data from 2015 onwards is taken from Meinshausen et al. (2020).

When referring to the co2 data sets, the following papers should be cited:
- Meinshausen, M., Smith, S.J., Calvin, K. et al. The RCP greenhouse gas concentrations and their extensions from 1765 to 2300. Climatic Change 109, 213 (2011). https://doi.org/10.1007/s10584-011-0156-z
- Meinshausen, M., Nicholls, Z. R. J., Lewis, J., Gidden, M. J., Vogel, E., Freund, M., Beyerle, U., Gessner, C., Nauels, A., Bauer, N., Canadell, J. G., Daniel, J. S., John, A., Krummel, P. B., Luderer, G., Meinshausen, N., Montzka, S. A., Rayner, P. J., Reimann, S., Smith, S. J., van den Berg, M., Velders, G. J. M., Vollmer, M. K., and Wang, R. H. J.: The shared socio-economic pathway (SSP) greenhouse gas concentrations and their extensions to 2500, Geosci. Model Dev., 13, 3571–3605, 2020 https://doi.org/10.5194/gmd-13-3571-2020

When referring to the ch4 data sets, the following papers should be cited:
- Meinshausen, M., Vogel, E., Nauels, A., et al. Historical greenhouse gas concentrations for climate modelling (CMIP6), Geosci. Model Dev., 10, 2057–2116 (2017). https://doi.org/10.5194/gmd-10-2057-2017
- Meinshausen, M., Nicholls, Z. R. J., Lewis, J., Gidden, M. J., Vogel, E., Freund, M., Beyerle, U., Gessner, C., Nauels, A., Bauer, N., Canadell, J. G., Daniel, J. S., John, A., Krummel, P. B., Luderer, G., Meinshausen, N., Montzka, S. A., Rayner, P. J., Reimann, S., Smith, S. J., van den Berg, M., Velders, G. J. M., Vollmer, M. K., and Wang, R. H. J.: The shared socio-economic pathway (SSP) greenhouse gas concentrations and their extensions to 2500, Geosci. Model Dev., 13, 3571–3605, 2020 https://doi.org/10.5194/gmd-13-3571-2020

For ISIMIP participants, these files are available for download on the DKRZ cluster server using the path /work/bb0820/ISIMIP/ISIMIP3b/InputData/climate/atmosphere_composition

For external users, these data can be downloaded from the ISIMIP Repository using the link below.