Accumulated cooling

accumulated cooling

The total cooling since the time in the evening when the turbulent heat flux near the ground produces a net heat flow from the earth to the atmosphere; used to measure or predict evolution of the stable boundary layer.

It is defined as the integral of the surface kinematic heat flux

over time, starting from the time t₀ just before sunset when the flux changes from positive to negative, and ending at any time t_e before the flux changes sign back to positive. Dimensions are temperature times length, such as (K·m). In the absence of advection and direct radiative cooling of the air, accumulated cooling (AC) also equals the area under the potential temperature profile z(θ), integrated from the surface potential temperature θ_s to the residual-layer potential temperature θ_RL, that is,

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The total cooling since the time in the evening when the turbulent heat flux near the ground produces a net heat flow from the earth to the atmosphere; used to measure or predict evolution of the stable boundary layer.