CACTI Workshop 2025

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. 
A preliminary agenda is now available. The workshop will feature scientific presentations and discussion sessions organized around the themes of Radiative Forcing, Climate Response and Feedbacks, and Atmospheric Composition and Air Quality.

The next CACTI workshop will take place from Tuesday 16th September to Thursday 18th September 2025 inclusive in person at the UK Met Office (Exeter, United Kingdom) and online.
Exeter is a city in the south west of England, approximately 320 km (200 miles) to the west of London (~2 hours 15 mins by train). International rail from Paris and Brussels to London can be done via Eurostar. Most international flights arrive at London Heathrow (180 miles from Exeter), from which visitors can travel by rail into London and then from London out to Exeter. However, there are several international flights daily to Bristol Airport (66 miles from Exeter), which is possible to reach Exeter by train or coach. 

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).If you need a formal letter for your travel approval and/or visa, please contact fiona.oconnor@metoffice.gov.uk or steven.turnock@metoffice.gov.uk.

At the  heart of Exeter stands the magnificent Exeter Cathedral, a masterpiece of Gothic architecture with soaring ceilings and centuries of stories etched in stone. Beneath the city lies the fascinating Underground Passages, medieval tunnels that once carried fresh water to the people of Exeter. Art lovers can visit the Royal Albert Memorial Museum (RAMM), home to impressive collections of art, archaeology, and natural history. Beyond the city, Devon offers a rich tapestry of landscapes—from the wild beauty of Dartmoor National Park to the stunning beaches of the Jurassic Coast.