Energy Dispersion in Easterly Waves
The hovmoller plot above shows the 850-hPa meridional wind regressed against the time series of filtered meridional wind at [10N, 15W] base point and averaged over 10-20N latitudes. A clear westward phase and eastward group propagation is evident. It can be shown that the direction of group propagation can be understood by examining vertically averaged ageostrophic gepotential fluxes.
For more information |---> Published paper (Diaz and Aiyyer, 2013a). Note: The published version of the Hovmoller in Figure 1 in the paper was inadvertently truncated in time. Please refer to the correct version here: Figure 1