摘要：Is radiation important for tropical climate variability? In this talk I will present analyses that show the roles of radiation in tropical climate variation, diagnosed from both satellite and modelling data. First, I will discuss the radiative energetics during the ENSO cycle. In this case, we find a strong and interesting cloud radiative feedback that drives atmospheric and oceanic variability differently at different phases of ENSO. Current GCMs have biases in representing this effect. Second, I will discuss the relation between radiation and tropical circulation strength. We find the differential radiative heating between the ascending and subsidence regions strongly controls the tropical mean circulation strength, which explains the weakening of the circulation during global warming.