Kelvin Wave and Madden-Julian Oscillation Simulated by A Spectral Element Atmospheric Model under Aqua-Planet Conditions
Giraldo, Francis X.
Peng, Melinda S.
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The Naval Research Laboratory (NRL) Spectral Element Atmospheric Model (NSEAM) coupled with full physics is used to investigate the organization and propagation of Kelvin waves and Madden-Julian Oscillation under the aqua-planet conditions. It is reported that the model simulation is highly sensitive to the horizontal viscosity, distribution of model vertical levels, and precipitation physics, based on the analysis of simulated convective precipitation in terms of timelongitude plots and the spectral diagrams designed by Wheeler and Kiladis. The experiments results confirm the large variability of model simulations associated with convective processes and their coupling to large-scale wave motion, as observed by other global atmospheric models with the aqua-planet setting. The physics of the model is calibrated to capture the essential interaction between the dynamics and physics of the atmosphere, thereby improving the simulation of equatorially trapped atmospheric waves. The main features simulated by the new model with calibrated physics are similar to those predicted by the simplified theory and found in limited observations in view of the speed and spectrum of the eastward propagating Kelvin waves and the signature of the Madden-Julian Oscillation.
The 2008 AGU Fall Meeting, 15-19 December 2008, San Francisco, CA, USA
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