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A CANOPY STOMATAL RESISTANCE MODEL



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ooo4 69al s s1 00 0 00 rnospkric l iromunrVol 21 No I pp 91 101 1987 Pergmon Jourmlr Ltd Printed in Gnxr B in A CANOPY STOMATAL RESISTANCE MODEL FOR GASEOUS DEPOSITION TO VEGETATED SURFACES DENNIS D BALDOCCHI BRUCE B HICKS and PAMELA CAMARA Atmospheric Turbulence and Diffusion Division Air Resources Laboratory NOAA P O Box 2456 Oak Ridge TN 37831 U S A First received 24 December1985 and in fi ljon 27 June 1986 Abstract A gaseous deposition model based on a realistic canopy stomata1 resistance submodel is described anal and tested This model is designed as one of a hierarchyof simulations leading up to a big leaf model of the processes contributing to the exchange of trace gases between the atmosphere and vegetated surfaas Computations show that differencesin plant species and environmentaland physiological conditions can affect the canopy stomatal resistanceby a factor of four Canopy stomata1r stances to water vapor transfercomputed with the present model arc compared against values measuredwith a poromcter and computed with the Penman Montcith equation Computed stomata1resistances from a soybean canopy in both well watered and water stressedconditions yield good agreement with test data The stomata1resistance submodcl responds well to changing environmental and physiological conditions Model predictions of deposition velociticsareevaluated for the case of ozone transferredto maize Calculated deposition velocities of 0 overestimate measured values on the average by about 30 probably largely as a consequence of uncertaintiesin leaf area index soil and cuticle resistances and other modeling parameters but also partially due to imperfect measurement of O3 deposition velocities Key word index Dry deposition stomata1 conductance environmental physiology micrometeorology since it depends on the chemical species and is a function on many meteorological biological and surface variables see Sehmel 1980 Hosker and Lindberg 1982 Hosker 1986 Most efforts to model and



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