The troposphere is the lowest main layer of the terrestrial atmosphere, with weather and generally decreasing temperature with altitude. Local inversions and moist convection complicate a single lapse-rate description.
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 lowest part of the terrestrial atmosphere that responds directly to surface fluxes on relatively short timescales through turbulence. Its depth changes with heating, stability and weather; a sharp composition or temperature change can mark its top. A uniform-layer chemical budget converts a surface flux into a volume tendency by dividing by layer depth.
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.
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