Multimodel simulation data used in Cohen et al., Staniaszek et al., and Bellouin et al. (to be submitted)

The following files are derived from the output of the models EMAC, LMDZ-INCA, MOZART3, and OsloCTM3, analyzed in Cohen et al. (EGUSphere, https://doi.org/10.5194/egusphere-2025-4273).
The files consist of 4-dimensional fields, as mean seasonal cycles (12-long time dimension) derived from 5-year simulations (4-year simulations for OsloCTM3).

They are made to investigate the impact of aircraft emissions on atmospheric chemistry and the consequent effective radiative forcing.

Please note that this initial version is published before the submission of the related papers. Thus, there is necessarily an update to be made (though not in the files), and we invite the user to check the latest version.

Naming convention:

[experiment]_[scenario].nc 

[experiment] can be REF, SEN100, SEN20, or SEN20_NOx

• REF is the run with all emissions
• SEN100 is a run without emissions from aviation
• SEN20 is a run with all emissions from aviation reduced by 20 %
• SEN20_NOx is a run with NOx emissions from aviation reduced by 20 %

[scenario] can be PD, SSP1, SSP3, airSSP1_bgSSP3, or airSSP3_bgSSP1.

• PD (present day) refers to the period spanning from 2014 until 2018 (2014 - 2017 for OsloCTM3)
• SSP1 refers to anthropogenic emissions in 2050 following the SSP1 scenario
• SSP3 refers to anthropogenic emissions in 2050 following the SSP3 scenario
• airSSP1_bgSSP3 refers to anthropogenic emissions in 2050 following SSP1 scenario for aviation and SSP3 scenario for other anthropogenic emissions
• airSSP3_bgSSP1 refers to anthropogenic emissions in 2050 following SSP3 scenario for aviation and SSP1 scenario for other anthropogenic emissions

Every run has the same meteorology as in the present-day simulations.

Further details are available in the README.txt document.
The model simulations follow a common protocol designed in the framework of the ACACIA EU project.

So far, the three studies mentioned in the title of this description are submitted (or planned to be submitted) as:

• Cohen, Y., Hauglustaine, D., Staniaszek, Z., Lund, M. T., Dedoussi, I., Matthes, S., Quadros, F., Righi, M., Skowron, A., and Thor, R.: Impact of present aircraft NO_x and aerosol emissions on atmospheric composition and climate: results from a model intercomparison, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-4273, 2025.
• Staniaszek et al., Dependence of future aviation NOx impacts on background conditions
• Bellouin et al., Assessment of the uncertainty in the effective radiative forcing of aviation: nitrogen oxide emissions, contrail cirrus formation, and aerosol-cloud interactions