The first process can limit the chemical reaction rate. Moreover, at the boundaries, the entrainment and deposition of reactants are governed by the turbulent fluxes.
Ultraviolet radiation enables chemical species to be photolyzed.
This radiation field can be strongly modified by the presence of boundary layer clouds or canopy. The basic concepts of the turbulent dynamics and chemistry in the atmopsheric boundary layer are described during the lecture. The governing equations and the dimensionless parameters are derived for this turbulent reacting flow. Prototypes of atmospheric boundary layer with chemically reactive species are presented to illustrate the current knowledge of the subject. Some examples of parameterizations to account for the effect of the physical processes on atmospheric chemistry will be given.