Department Seminar: Lily Hahn

Title: Role of atmosphere-ocean-ice interactions for warming in the Arctic and beyond

Abstract: The Arctic has warmed up to four times faster than the global average in recent decades, yet there is still debate over the drivers of polar-amplified warming, how they interact with each other, and their relative importance. We investigate the role of sea ice for Arctic warming and its seasonality using experiments in idealized and comprehensive climate models. We also examine the role of intermodel spread in ocean circulation changes, specifically the Atlantic Meridional Overturning Circulation, for warming in the Arctic and globally. The results highlight key mechanisms by which sea ice and ocean circulation mediate atmospheric feedbacks and warming under increased climate forcing.