A large-eddy simulation is modified to include multiple scalars emitted by a plant canopy. Each of these scalars is subjected to varying rates of chemical loss. Presented is a detailed comparison between conserved species and species undergoing first- and second-order chemical loss. Profiles of mean mixing ratio, mixing-ratio variance and vertical mixing-ratio flux reveal the influence of chemical reactivity. Distribution of the scalar source through the depth of the canopy is shown to locally reduce the reaction rate for second-order species. Transport efficiencies, diffusion coefficients, and mean source heights also exhibit chemical dependencies. Budgets of mixing-ratio variance and flux clucidate the mechanisms through which chemistry modifies each. Instantaneous fields show the existence of intermittently occuring coherent structures that are thought to enhance species segregation.
All Science Journal Classification (ASJC) codes
- Atmospheric Science