(a) Temperature fluctuation (solid, left axis) and density fluctuation (dashed, right axis), averaged separately over upflows (red) and downflows (blue). (b) Horizontally averaged force ﹩{\overline{{\mathscr{F}}}}_{z}=\overline{\rho {{Du}}_{z}/{Dt}}﹩ (solid lines, left axis), and the accelerating power ﹩{\overline{P}}_{z}=\overline{{u}_{z}{{\mathscr{F}}}_{z}}﹩ of those forces (dashed, right axis). ﹩{\overline{P}}_{z}^{\uparrow }﹩ is scaled up by a factor of five. ﹩{\overline{{\mathscr{F}}}}_{\mathrm{visc}}﹩ and ﹩{\overline{P}}_{{\rm{visc}}}﹩ are the corresponding viscous force and its power. (c) Averaged enthalpy flux (solid lines) along with parameterizations according to Equation (8) (dashed). The inset shows ﹩{\tau }_{\mathrm{to}}﹩ and ﹩{\tau }_{\mathrm{bu}}﹩ as functions of depth in units of ﹩\sqrt{d/g}﹩. Data for Run K.