The Evidence for Two-Way Feedbacks Between Cloud Processes and Large Scale Climate Variability over the Southern Oceans

Thursday, 18 December 2014: 4:16 PM
David W J Thompson and Ying Li, Colorado State University, Fort Collins, CO, United States
Large scale patterns of climate variability over the Southern Oceans have been widely examined in the context of dry atmospheric dynamics but less so in the context of two-way interactions with clouds. In this talk I will survey the emerging evidence for feedbacks between large scale climate variability and cloud processes over the Southern Oceans. Observational and numerical analyses reveal that large-scale patterns of Southern Hemisphere climate variability have a pronounced signature not only in cloud incidence but also in cloud radiative forcing. Numerical experiments suggest that cloud processes, in turn, may play a key role in determining the structure and amplitude of hemispheric scale dynamic variability. Implications for climate variability on a range of timescales is discussed.