Astrophysics Colloquium Seasonal Cycles over a Broad Range of Planetary Climates Presented by Ana Lobo California Institute of Technology Monday, September 28, 2020 Virtual Event starts at 12:00 noon Abstract Radiative imbalance at the top-of-atmosphere drives the general circulation of Earth-like planetary atmospheres. Yet, how fundamental atmospheric features, such as the Hadley cell and extratropical eddies, respond to different radiative forcing and impact the surface climate and the hydrological cycle remains poorly understood. This is particularly true when seasonal cycles are being considered. We explore the response of the large-scale circulation, and associated climate, to perturbations in both the shortwave radiation, through obliquity changes, and perturbations in longwave radiation through changes in the meridional and vertical structure of the imposed optical depth. We focus on seasonal phenomena that are not captured by annual mean forcing. JPL Contact: Renyu Hu   Site Manager: Webmaster: CL 08-3220