EGU24-6364, updated on 08 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Evolving The Coupled Model Intercomparison Project (CMIP) To Better Support The Climate Community And Future Climate Assessments

Helene Hewitt1, John Dunne2, and the CMIP Panel and IPO*
Helene Hewitt and John Dunne and the CMIP Panel and IPO
  • 1Met Office, Exeter, UK
  • 2NOAA/OAR/GFDL, Princeton, NJ, USA
  • *A full list of authors appears at the end of the abstract

Over four decades, CMIP has driven massive improvements in the modelled representation of the Earth system, whilst also seeing huge growth in its scope and complexity. In its most recent phase, CMIP6, a broad spectrum of questions continues to be answered across twenty-four individual model intercomparison projects (MIPs). This science improves process understanding and assesses the climate’s response to forcing, systematic biases, variability, and predictability in line with WCRP Scientific Objectives. CMIP and its associated data infrastructure have become essential to the Intergovernmental Panel on Climate Change (IPCC) and other international and national climate assessments, increasingly including the downstream mitigation, impacts, and adaptation communities.

However, despite the invaluable science produced from CMIP6 data, many challenges were still faced by the model data providers, the data delivery infrastructure, and users, which need to be addressed moving forwards. A specific challenge in CMIP6 was the burden placed on the modelling centres, in part due to the large number of requested experiments and delays in the preparation of the CMIP6 forcing datasets and climate data request.

The CMIP structure is evolving into a continuous, community-based climate modelling programme to tackle key and timely climate science questions and facilitate delivery of relevant multi-model simulations. This activity will be supported by the design of experimental protocols, an infrastructure that supports data publication and access, and quasi-operational extension of historical forcings.  A subset of experiments is proposed to be fast-tracked to deliver climate information for national and international climate assessments and informing policy and decision making. The CMIP governing panels are coordinating community activities to reduce the burden placed on modelling centres, continue to enhance novel and innovative scientific activities, and maximise computational efficiencies, whilst continuing to deliver impactful climate model data.

CMIP Panel and IPO:

Helene Hewitt, John P. Dunne, Julie Arblaster, Olivier Boucher, Paul Durack, Tomoki Miyakawa, Matt Mizielinski, Robert Pincus, Sasha Ames, David Hassell, Birgit Hassler, Forrest Hoffman, Martin Juckes, Guillaume Levavasseur, Chloe Mackallah, Vaishali Naik, Atef Ben Nasser, Benjamin Sanderson, Isla R. Simpson, Martina Stockhause, Karl E. Taylor, Beth Dingley, Daniel Ellis, Eleanor O’Rourke, Briony Turner

How to cite: Hewitt, H. and Dunne, J. and the CMIP Panel and IPO: Evolving The Coupled Model Intercomparison Project (CMIP) To Better Support The Climate Community And Future Climate Assessments, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-6364,, 2024.