Energy changes in baroclinic models
Huehn, Kelvin Wayne
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The effects of heat transfer on the kinetic energy tendencies of a perturbation superimposed on a basic zonal current are investigated. The rate at which kinetic energy is gained in both the adiabatic and diabatic models increases with time for medium wave lengths, but the rate of increase is less for the diabatic case. At the longer wave lengths the energy change for the diabatic model shows a decrease with time becoming negative toward the end of the time interval investigated. The adiabatic model, in contrast, has zero energy tendency at long wave lengths. The rate of kinetic energy change increases as larger values of thermal wind are selected, and for the adiabatic model the wave length range for which energy changes occur also expands with increasing thermal wind. The energy gain initially is a maximum when the thermal wave lags the pressure wave by a phase angle of 90 degrees and the maximum tendency to lose energy occurs when the lag is 270 degrees.
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