Dynamic and Thermodynamic Balances in Madden-Julian Oscillation

Samson Hagos Pacific Northwest National Laboratory

Category: Modeling

Working Group: Cloud Life Cycle

In order to identify the simplest set of balances that govern the dynamics of the Madden-Julian Oscillation (MJO), scale analysis is performed on the various components of the wind, moisture, and potential temperature tendencies from an observationally constrained WRF simulation that realistically simulates the 2007–2008 MJO signal over the eastern hemisphere. First, the performance of the WRF simulation in reproducing the observed propagation characteristics is evaluated. Then, from the budget analysis of the governing equations, the contributions of smaller-scale convective processes, radiation, surface fluxes, and interactions with subtropical systems are quantitatively assessed. Finally, the results of the analysis are used to construct a simplified paradigm for MJO propagation.

This poster will be displayed at ASR Science Team Meeting.