Emerging importance of chemistry-climate coupling on weather to climate timescales

The intricate interplay between atmospheric composition changes and climate dynamics is garnering increasing attention due to its implications for weather and climate prediction. In this talk, I leverage advanced modeling techniques and new observational climate data records to provide examples of chemistry-climate coupling on timescales ranging from subseasonal-to-seasonal weather to long-term climate trends. These examples include the impact of dynamical processes and abrupt events such as sudden stratospheric warmings and the Hunga-Tonga eruption on atmospheric composition anomalies and their feedbacks on meteorological and climate phenomena, as well as the impacts of stratospheric ozone depletion and recovery on climate radiative forcing and atmosphere-ocean dynamics. The findings underscore the important feedback loops between atmospheric composition and climate dynamics via radiative processes, emphasizing the need for a realistic representation of composition anomalies in weather forecast systems and climate models.