Presentation PDF (62.3 kB)
We will first report the results of our evaluation of the tropical intraseasonal variability, especially the fidelity of the MJO simulations, in 14 climate models participating in the IPCC Fourth Assessment Report. Because the MJO problem is a common problem in many GCMs, our hypothesis is: The MJO problem is caused by some missing physics in current GCMs. I will discuss about a framework to synthesize the existing MJO theories, and to guide our search for the missing physical processes important for the MJO. Our parallel diagnostics of observational data (satellite, field experiment and reanalyses) and GCM simulations have revealed three missing physical processes that are likely important for the MJO. They include: (1) self-suppression processes in tropical deep convection; (2) convective momentum transport by shallow convection; and (3) stratiform precipitation and stratiform heating profile.
It would be interesting to install these missing physics into GCMs and test their impacts on the MJO simulation.
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