Acid in the Environment: Lessons Learned and Future by Gerald R. Visgilio, Diana M. Whitelaw

By Gerald R. Visgilio, Diana M. Whitelaw

This booklet is the results of a convention held biannually on the Goodwin-Niering heart for Conservation Biology and Environmental experiences at Connecticut collage. It makes use of an interdisciplinary method of concentrate on vital ecological affects of acid deposition. The ebook combines examine findings and the coverage analyses of specialists from assorted educational disciplines with the positions complex via representatives of varied nongovernmental companies.

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This page intentionally blank Parti Ecological Impacts of Acid Deposition This page intentionally blank 3. Acidic Deposition: Sources and Ecological Effects Charles T. Driscoll, Kathy Fallon Lambert and Limin Chen 1. Acidic Deposition Acidic atmospheric deposition, popularly referred to as acid rain, is the transfer of strong acids and acid forming substances from the atmosphere to the Earth's surface. Acidic deposition is comprised of sulfuric and nitric acids, and ammonium derived from atmospheric emissions of sulfur dioxide, nitrogen oxides, and ammonia respectively.

52 Charles T. Driscoll et al. ^s^Cy---^^^^'^^^ 20 18 "Z. 0 \ 20 15 < £ 10 5 15 CO . 10. Time series of predictions with the acidification model PnET-BGC of changes in stream chemistry at Hubbard Brook to changes in past and potential future emissions of sulfur dioxide and nitrogen oxides, including the 1990 Amendments of the Clean Air Act and moderate and aggressive emission control scenarios. Shown are model-predicted stream concentrations of sulfate, nitrate, acid neutralizing capacity, pH and dissolved inorganic aluminum, and soil percent base saturation.

Waters with ANC values greater than 50 |Lieq/L are less sensitive to acidic deposition. The capacity of a watershed to prevent decreases in ANC and resist the effects of acidic deposition depends on many factors, including climate, soil conditions, surficial and bedrock geology, and land-use history. 42 Charles T. Driscoll et al. organic acids. However in contrast to watersheds which are acidified by acidic deposition, waters that are acidic due to organic acids have high concentrations of aluminum which is largely complexed with organic solutes and therefore less toxic to aquatic biota (Driscoll et al.

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