Virtual Workshop Series on Stratospheric Aerosol Injection (SAI)

Virtual Workshop Series on Stratospheric Aerosol Injection (SAI)

6 – 9 October 2025 via Zoom

Over four intensive days, more than 200 participants from around the globe came together for the Virtual Workshop Series on Stratospheric Aerosol Injection (SAI), hosted by the WCRP Lighthouse Activity- Research on Climate Intervention and the Core Activity “Atmospheric Processes and their Role in Climate”. Featuring 52speakers, the event provided a lively forum for in-depth discussions on SAI, a proposed climate intervention that would aim to reduce the impacts of global warming through the injection of reflective particles in the stratosphere. As this topic becomes more widely discussed, it is important that robust scientific discussions are had to better identify potential risks and impacts of SAI across different scenarios, to understand and reduce uncertainties in future projections using Earth System Models, and to address SAI science questions using small scale deployment that may not be answered by studying natural analogues only 

The workshops explored a wide range of topics, from observational strategies and modeling of stratospheric aerosols to climatic, societal, and ecological impacts, as well as the ethical considerations of studying and testing SAI. Participants shared the latest research, debated potential risks and uncertainties, and considered strategies for robust monitoring and simulation of future scenarios. 

By fostering an inclusive, international dialogue, the series emphasized collaboration across observational and modeling communities, aiming to advance our understanding of Earth system responses to climate interventions and inform evidence-based policy and governance. 

Themes:

  • Observational strategies: detection, monitoring and attribution
  • SAI modeling: processes, capabilities and uncertainties
  • Simulation strategies and scenario exploration (emulators)
  • Impacts on atmospheric composition, from the stratosphere to air quality
  • Global and regional surface climatic impacts, including societal and ecological
  • Ethical aspects of studying and testing SAI

Please see below for the recordings from the workshop sessions. 

The detailed session programme and presentation abstracts can be found in this document.

Organizing Committee

Name Affiliation Country
Daniele Visioni Cornell University USA
Marc von Hobe Forschungszentrum Jülich Germany
Karen Rosenlof NOAA USA
Jean-Paul Vernier NASA Langley/NIA/University of Reims USA / France
Simone Tilmes NCAR USA