Long-term simulation of decreased acid loading on forested watershed
Journal of Environmental Engineering
DOI of Published Version
The response of a northeastern U.S. hardwood forest to wet and dry deposition of hydrogen ion and sulfate deposition was performed using the hydrobiogeochemical, lumped-parameter Terrestrial Aquatic Model for Ecosystems (TAME). Results of model calibration and output stream chemistry show that ion-exchange and mineral dissolution processes in the B and C horizons buffer the acidic, ambient atmospheric deposition [864 eq-SO4-2/(ha/yr) and 718 eq-H+/(ha/yr)] in this hydrologically tight and flashy watershed. Watershed response to a 50% decrease in total deposition of acidity over twenty years indicates that the watershed is linear with respect to sulfate (50% decrease in mass outflow) but less responsive with respect to acid neutralizing capacity, ANC (11% increase in stream volume-weighted average ANC concentrations). Only moderate improvements in ANC can be expected from emission controls and decreased sulfate deposition.
Published Article/Book Citation
Journal of Environmental Engineering, 120:2 (1994) pp.291-312.