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An Assessment of the Use of Forests as Sinks for the Removal of Atmospheric Sulfur Dioxide¹

ABSTRACT

A computer model was developed for estimating the uptake of sulfur dioxide (SO²) by forests. Submodels are used to calculate atmospheric diffusion immediately above and within the forest canopy, and into the sink areas within the trees. The program implementing the model is general and can be used with only minor changes for many gaseous pollutants.

Simulations with SO₂ sources above the canopy indicate that moderate amounts of SO₂ can be absorbed by forests during periods of favorable weather. Simulations with sources inside the canopy suggest that SO₂ uptake can be increased while tolerable levels of SO₂ concentrations are maintained in the atmosphere within the forest.

Key Words: vegetation • adsorption • simulation • model

¹ The information contained in this article was developed during the course of work under Contract no. AT(07-2)-1 with the U. S. Energy Res. and Dev. Admin.

² Research Meteorologist, Savannah River Lab., E. I. du Pont de Nemours and Co., Aiken, SC 29801; Research Agronomist, USDA, ARS, Northeast Region (NER), Cornell University, Ithaca, NY 14850; and Professor of Forest Meteorology, School of Forestry and Environmental Studies, Duke University, Durham, NC 27706, respectively.

Received for publication June 7, 1976.