MAGICC-CNit probabilistic cross-ESM projection results for ScenarioMIP-CMIP6 Tier-1 SSPs

This dataset contains probabilistic projections of climate and carbon–nitrogen dynamics across multiple CMIP6 Earth system models (ESMs) under the Tier-1 SSP scenarios of ScenarioMIP-CMIP6, generated using the MAGICC-CNit reduced-complexity model. It includes all climate–carbon–nitrogen cycle variables as global annual-mean values. The MAGICC model source code is available at https://gitlab.com/magicc/magicc (MAGICC Development Team, 2025). The CNit model description and calibration are provided in our previous publications (Tang et al., 2025a), and the source code is available at https://doi.org/10.5281/zenodo.12204421 (Tang et al., 2025b). Related publications: Tang, G., Nicholls, Z., Norton, A., Zaehle, S., and Meinshausen, M.: Synthesizing global carbon–nitrogen coupling effects – the MAGICC coupled carbon–nitrogen cycle model v1.0, Geosci. Model Dev., 18, 2193-2230, https://doi.org/10.5194/gmd-18-2193-2025, 2025a. Tang, G., Zaehle, S., Nicholls, Z., Norton, A., Ziehn, T., and Meinshausen, M.: Model Source Code for the MAGICC Coupled Carbon–Nitrogen Cycle Model – CNit, https://doi.org/10.5281/zenodo.15569386, 2025b. Tang, G., Zaehle, S., Nicholls, Z. R. J., Norton, A., Ziehn, T., and Meinshausen, M. A.: Understanding the Drivers of Carbon-Nitrogen Cycle Variability in CMIP6 ESMs with MAGICC CNit v2.0: Model and Calibration Updates, https://doi.org/10.22541/essoar.175008280.09297369/v1, 2025c.