The changes in the jet are considered after 15 days, which corresponds to the end of an initial instability event. The separate contributions to the jet change from the eddy momentum, heat, and moisture fluxes can be diagnosed using a linear diagnostic based on the Kuo-Eliassen equation. It is shown that the wave-induced latent heating drives an indirect cell which reduces the baroclinicity on the equatorward flank of the jet, while the eddy sensible heat flux acts to reduce the baroclinicity near the center of the jet. The strength of the moist baroclinic forcing increases with the initially available moisture content.
From the transformed Eulerian mean (TEM) and isentropic perspectives, the eddy moisture flux enhances the meridional circulation and the eddy forcing of the mean flow. The circulation and EP flux are shown to be around four times as strong with a greater equatorward extent on moist isentropes than on dry isentropes. The equatorward extension of the moist EP flux overlaps with the region where the baroclinic forcing is driven by latent heating. The moist EP flux successfully captures the moisture-driven component of the baroclinic forcing that is not captured by the dry EP flux.