CICERO - Center for International Climate Research

EVA - Earth system modelling of climate Variations in the Anthropocene

EVA will provide a cutting-edge version of the Norwegian Earth system model NorESM for global climate assessments (CMIP6, IPCC AR6) including prognostic climate experiments and analyses of key importance for the national and international community

The Norwegian Earth system model (NorESM) as the main national facility for global climate studies will be further developed, extended, quality checked, and applied to key research questions in the field of climate science. In particular, NorESM2 will be established also for participation in key international assessments.
NorESM experiments on drivers for climate variability will be carried out, and related feedbacks will be quantified adressing key uncertainties. Complex spatio-temporal structures of the climate system will be analysed including
interactions between physical processes and biogeochemical cycles.

The planned pre-industrial, historical, and future NorESM simulations together with observational evidence provide the foundation for discriminating
natural and human-induced climate variability. More complete process representations in NorESM evaluated against observations and re-analyses will enable more realistic quantifications of uncertainties in state-of-the-art climate simulations. Relevant Arctic climate processes are addressed: cold clouds, Arctic haze, sea-ice and permafrost thawing. EVA is firmly embedded in the international scientific research field. NorESM is provided as a major national infrastructure for large-scale predictive climate studies. Results and data sets are open to all end-users (scientifists, policy makers, the public). For adaptation and mitigation purposes, data will be available through the National Climate Service Center (, UniResearch and NVE).