Measurement of Dry Deposition to Vegetative Surfaces

Abstract

The importance of dry deposition was assessed to oak and pine trees, in a hardwood and coniferous canopy, respectively. In both canopies, ambient particle and gas concentrations on the interior were decreased relative to perimeter concentrations due to dry deposition scavenging by the canopy. Deposition of all species was higher to perimeter leaves than to interior leaves, due both to the lower concentrations and the lower wind speeds in the sheltered interior. The deposition velocities measured to the pine needles were similar to the values measured to the oak leaves.