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The troposphere above the directly surface-coupled atmospheric boundary layer. Entrainment between these regions can change pollutant abundances even when local chemical production is unchanged.

The atmospheric boundary layer over an ocean surface. A box-model ozone budget can include in-layer production, chemical loss, dry deposition, entrainment from the free troposphere and horizontal Advection. Fixed-depth local steady-state assumptions must be checked against transport and day–night variation.