CCMI - Chemistry-Climate Model Initiative
Coordinating Experts Driving the Project
Activity Leads
Tatsuya Nagashima
Center for Regional Environmental Research, National Institute for Environmental Studies, Japan
nagashima.tatsuya@nies.go.jp
David Plummer
Environment and Climate Change Canada, Montreal, CA
david.plummer@canada.ca
Guidance from Key Scientific Leaders
Steering Committee
- Alexander Archibald
tropospheric chemistry, modelling; United Kingdom - Gabriel Chiodo
chemistry-climate interactions; Switzerland - Suvarna Fadnavis
Asian monsoon – chemistry; India - Hella Garny
chemistry-climate modelling; Germany - Béatrice Josse
chemistry-transport modelling; France - Joowan Kim upper troposphere – lower stratosphere processes; South Korea
- Olaf Morgenstern
chemistry-climate modelling; Germany - Lee Murray
tropospheric chemistry, modelling; United States - Clara Orbe
atmospheric chemistry and transport; United States - Amos Tai
biosphere-atmosphere exchange, iLEAPS; Hong Kong
CCMI Representatives
ACAM: Clara Orbe (US), Mian Chin (China)
APARC ATC: Martin Dameris (GE)
WMO/UNEP scientific ozone assessment: Doug Kinnison (US) and Martyn Chipperfield (UK)
Overview of the Project’s Objectives and Scope
Activity Description
Increasingly, the chemistry and dynamics of the stratosphere and troposphere are being studied and modeled as a single entity in global models. As evidence, in support of the Intergovernmental Panel on Climate Change Sixth Assessment Report (IPCC AR6), several groups had performed simulations in the Coupled Model Intercomparison Project Phase 6 (CMIP6) using global models with interactive chemistry spanning the surface through the stratosphere and above. In addition, tropospheric and stratospheric global chemistry-climate models are continuously being challenged by new observations and process analyses. Some recent intercomparison exercises have for example highlighted shortcomings in our understanding and/or modeling of long-term ozone trends and methane lifetime. Furthermore, there is growing interest in the impact of stratospheric ozone changes on tropospheric chemistry via both ozone fluxes (e.g. from the projected strengthening of the Brewer-Dobson circulation) and actinic fluxes. This highlights that there is a need to better coordinate activities focusing on the two domains and to assess scientific questions in the context of the more comprehensive stratosphere-troposphere resolving models with chemistry. To address the issues, the joint IGAC/SPARC Chemistry-Climate Model Initiative (CCMI) was established to coordinate future (and to some extent existing) IGAC and APARC chemistry-climate model evaluation and associated modeling activities.
Mission statement:
The Chemistry Climate Model Initiative (CCMI) seeks to improve our understanding of the role of chemistry-climate interactions within the Earth system in the past, the present, and in future projections. CCMI, supported by Future Earth’s IGAC and the WCRP’s APARC projects, advances these goals by providing a forum for coordinated inter-model comparisons and analysis with observations, encouraging the dissemination of innovative ideas for chemistry climate research, and building a strong and inclusive global science community.
Key Insights from Research Outcomes
Published Results
ACP/AMT/ESSD/GMD inter-journal special issue on CCMI
Papers submitted and published to the CCMI special issue can be viewed here
Peer-Reviewed Contributions to Climate Science
Journal Publications
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Benito-Barca, S., M. Abalos, N. Calvo, H. Garny, T. Birner, N. L. Abraham, H. Akiyoshi, F. Dennison, P. Jöckel, B. Josse, J. Keeble, D. Kinnison, M. Marchand, O. Morgenstern, D. Plummer, E. Rozanov, S. Strode, T. Sukhodolov, S. Watanabe and Y. Yamashita, Recent Lower Stratospheric Ozone Trends in CCMI-2022 models: Role of Natural Variability and Transport, J. Geophys. Res., 130, e2024JD042412. https://doi.org/10.1029/2024JD042412, 2025.
- Polvani, L. M., L. Wang, M. Abalos, N. Butchart, M. P. Chipperfield, M. Dameris, M. Deushi, S. S. Dhomse, P. Jockel, D. Kinnison, M. Michou, O. Morgenstern, L. D. Oman, D. A. Plummer and K. A. Stone, Large impacts, past and future, of ozone-depleting substances on Brewer-Dobson circulation trends: A multimodel assessment. Journal of Geophysical Research: Atmospheres, 124, https://doi.org/10.1029/2018JD029516, 2019.
- Wales, P. A., R. J. Salawitch, J. M. Nicely, D. C. Anderson, T. P. Canty, S. Baider, B. Dix, T. K. Koenig, R. Volkamer, D. Chen, L. G. Huey, D. J. Tanner, C. A. Cuevas, R. P. Fernandez, D. E. Kinnison, J.-F. Lamarque, A. Saiz-Lopez, E. L. Atlas, S. R. Hall, M. A. Navarro, L. L. Pan, S. M. Schauffler, M. Stell, S. Tilmes, K. Ullmann, A. J. Weinheimer, H. Akiyoshi, M. P. Chipperfield, M. Deushi, S. S. Dhomse, W. Feng, P. Graf, R. Hossaini, P. Jöckel, E. Mancini, M. Michou, O. Morgenstern, L. D. Oman, G. Pitari, D. A. Plummer, L. E. Revell, E. Rozanov, D. Saint-Martin, R. Schofield, A. Stenke, K. Stone, D. Visioni, Y. Yamashita, and G. Zeng, Stratospheric Injection of Brominated Very Short-Lived Substances Inferred from Aircraft Observations of Organic Bromine and BrO in the Western Pacific, Journal of Geophysical Research: Atmospheres, 123, 5690–5719, https://doi.org/10.1029/2017JD027978, 2017.
- Anderson, D. C., Nicely, J. M., Wolfe, G. M., Hanisco, T. F., Salawitch, R. J., Canty, T. P., … Zeng, G., Formaldehyde in the tropical western Pacific: Chemical sources and sinks, convective transport, and representation in CAM-Chem and the CCMI models. Journal of Geophysical Research: Atmospheres, 122, 11,201–11, 226, https://doi.org/10.1002/2016JD026121, 2017.
Also check out any news from our project website https://blogs.reading.ac.uk/ccmi/
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Latest Developments and Ongoing Efforts
SPARC Activity Updates
SPARC Newsletter No. 57, 2021, p. 22: CCMI-2022: A new set of Chemistry-Climate Model Initiative(CCMI) Community Simulations to Update the Assessment of Models and Support Upcoming Ozone Assessment Activities, by D. Plummer, T. Nagashima, S. Tilmes, A. Archibald, G. Chiodo, S. Fadnavis, H. Garny, B. Josse, J. Kim, J.-F. Lamarque, O. Morgenstern, L. Murray, C. Orbe, A. Tai, M. Chipperfield, B. Funke, M. Juckes, D. Kinnison, M. Kunze, B. Luo, K. Matthes, P. A. Newman, C. Pascoe, and T. Peter.
SPARC Newsletter No. 54, 2020, p. 22: IGAC/SPARC CCMi summer school and workshop, by D. Plummer, T. Nagashima, M. Hegglin, A. Tai, T. Birner, A. Gettelman, B. Josse, J.-F. Lamarque, O. Morgenstern, G. Myhre, C. Orbe, S.-W. Son, and P. J. Young.
SPARC Newsletter No. 46, 2016, p. 37: Report on the IGAC/SPARC Chemistry-Climate Model Initiative (CCMI) 2015 Science Workshop, by Hegglin, M.I., J.-F. Lamarque, B. Duncan, V. Eyring, A. Gettelman, P. Hess, G. Myhre, T. Nagashima, D. Plummer, T. Ryerson, T. Shepherd, and D. Waugh.
SPARC Newsletter No. 43, 2014, p. 32: IGAC/SPARC Chemistry-Climate Model Initiative (CCMI) 2014 Science Workshop, by Hegglin, M. I., J.-F. Lamarque, V. Eyring, P. Hess, P. J. Young, A. M. Fiore, G. Myhre, T. Nagashima, T. Ryerson, T. G. Shepherd, and D. W. Waugh.
Discover Activity Data Products
CCMI in the APARC Data Centre
Data produced by the CCMI activity can be found at the APARC Data Centre located at CEDA. For more information on the data sets and access to the data, please visit our Data Centre web pages.
On the CCMI webpage a python script for downloading the data is provided as well as additional information on how to use it.
Explore Detailed Resources and Updates
Website for Further Information
For a more comprehensive look into the project, its activities, and its ongoing contributions to atmospheric and climate science, visit the dedicated CCMI website at http://blogs.reading.ac.uk/ccmi/. Explore the site to stay informed and engaged with the project’s progress and achievements.