Solid lines: radiative (purple), enthalpy (blue), kinetic energy (magenta), and SGS (green) fluxes for Runs K (a) and S (b). Red: ﹩{\rm{\nabla }}-{{\rm{\nabla }}}_{\mathrm{ad}}﹩. Dashed lines in (a): corresponding data from Run P. The thick horizontal lines on the abscissae mark the extent of the MZ.