Why Do Gcms Have Trouble with the MJO?

Charlotte A DeMott, Colorado State University, Atmospheric Science, Fort Collins, United States and Prof. David A Randall, Colorado State University, Fort Collins, United States
Abstract:
This paper summarizes what a global circulation model has to get right in order to simulate the Madden-Julian Oscillation (MJO). Through a process of elimination, the ability of models to moisten the lower troposphere during periods of heavy rain is identified as a key issue. The results shed light on the nature of the MJO, and also have implications for parameterization.
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