Registration and abstract submission for the next CACTI workshop, due to take place from Tuesday 16th September to Thursday 18th September 2025 inclusive in person at the UK Met Office (Exeter, United Kingdom) and online, are now open. 

Registration with the option to submit an abstract can be done by completing this form:

Abstract and Registration. The closing date for registration and abstract submissions is 

Friday 11 July 2025. 

If you’re planning to travel to the UK to attend the workshop in person, please check any requirements for a visa or an electronic travel authorization (ETA) at: https://www.gov.uk/check-uk-visa

If you need a formal letter from us for your travel approval and/or visa, please let us know and we can provide one. 

The scope of the workshop includes trace gas and aerosol composition responses to changes in natural and/or anthropogenic emission changes, air quality, radiative forcing, global and regional climate responses to emission perturbations, and climate feedbacks on trace gases and aerosols. Contributions on atmospheric composition process representation, model evaluation, as well as Earth system interactions are also in scope. We anticipate that the workshop will be of interest to those working on model intercomparison projects (MIPs) and community projects such as HTAP, CCMI, TOAR, and Aerocom, as well as CMIP7 community MIPs such as DAMIP, GeoMIP and RFMIP. The workshop will include oral presentations, poster presentations, and there will be breakout groups to discuss plans for analysis of the CMIP7 simulations, including Fast Track and other relevant community MIPs such as AerChemMIP2. 

Further details on CACTI activities can be found on our webpage (Workshop details will appear shortly!) and all further announcements on the workshop will be done via the CACTI and AerChemMIP2 mailing lists. These are low-traffic mailing lists and you can subscribe by sending an email to and , respectively.