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Water, Air, and Soil Pollution

, Volume 91, Issue 3–4, pp 271–282 | Cite as

Influence of organic acids on model projections of lake acidification

  • T. J. Sullivan
  • B. J. Cosby
  • C. T. Driscoll
  • D. F. Charles
  • H. F. Hemonds
Article

Abstract

We employed three mathematical models to make quantitative estimates of the pH of 33 statistically-selected lakes in the Adirondack mountains, New York (USA) prior to the Industrial Revolution (1840). The models included 1) the MAGIC watershed acidification model, 2) a paleolimnological model of diatom-inferred pH, and 3) the MAGIC model modified to incorporate an empirically-based model of natural organic acidity. Application of approaches 2) and 3) yielded consistent estimates of pre-industrial Adirondack lakewater pH. However, when the organic acid model was not included, MAGIC calculations and diatom-inferred values showed poor agreement. MAGIC projections of lakewater pH 50 years into the future, under differing atmospheric deposition scenarios, were also sensitive to inclusion of the organic acid model. MAGIC predicted greater recovery in response to reduced deposition when organic acids were not considered. These results suggest that failure to consider the pH buffering of naturally-occurring organic acidity will often result in biased projections which overemphasize the response of lakewater pH to changes in atmospheric inputs of strong acid.

Key words

acidification diatom model organic acids 

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • T. J. Sullivan
    • 1
  • B. J. Cosby
    • 2
  • C. T. Driscoll
    • 3
  • D. F. Charles
    • 4
  • H. F. Hemonds
    • 5
  1. 1.E&S Environmental Chemistry, Inc.Corvallis
  2. 2.Dept. Environmental ScienceUniversity of VirginiaCharlottesville
  3. 3.Dept. Civil and Environmental EngineeringSyracuse UniversitySyracuse
  4. 4.Patrick Center for Environmental ResearchAcademy of Natural SciencesPhiladelphia
  5. 5.Dept. Civil EngineeringMassachusetts Institute of TechnologyCambridge

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