Decaying Scalars Emitted By A Forest Canopy: A Numerical Study |
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| Authors: | Edward G Patton Kenneth J Davis Mary C Barth Peter P Sullivan |
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| Institution: | (1) National Center for Atmospheric Research, P. O. Box 3000, Boulder, Colorado USA, 80307-3000;(2) Department of Meteorology, The Pennsylvania State University, University Park, PA, USA |
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| Abstract: | 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 conservedspecies 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 thescalar source through the depth of the canopy is shown to locally reducethe reaction rate for second-order species. Transport efficiencies, diffusioncoefficients, and mean source heights also exhibit chemical dependencies.Budgets of mixing-ratio variance and flux elucidate the mechanisms throughwhich chemistry modifies each. Instantaneous fields show the existence ofintermittently occurring coherent structures that are thought to enhancespecies segregation. |
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| Keywords: | Canopy Chemistry Forest Isoprene Large-eddy simulation Turbulence |
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