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By Charles T. Driscoll Syracuse University

Effects of Acidic Deposition and Calculating Critical Loads of Acidic Deposition in the Adirondack R egion of New York. By Charles T. Driscoll Syracuse University. Outline. Data sets Model calculations Critical load calculations Conclusions. Syracuse University Wei Wu Jing Zhai

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By Charles T. Driscoll Syracuse University

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  1. Effects of Acidic Deposition and Calculating Critical Loads of Acidic Depositionin the Adirondack Region of New York By Charles T. Driscoll Syracuse University

  2. Outline • Data sets • Model calculations • Critical load calculations • Conclusions

  3. Syracuse University Wei Wu Jing Zhai Richard Warby Chris Johnson Brenden McNeil NYDEC/ALSC Karen Roy SUNY ESF Myron Mitchell E&S Tim Sullivan Univ. Virginia Jack Cosby USDA FS Linda Pardo Natasha Duarte Collaborators

  4. Survey ALSC (chemistry, fish) EMAP/Time (chemistry) DDRP (chemistry, soil, foliage) Monitoring ALTM (chemistry, soil) RPI (aquatic biota?) GIS Atmospheric deposition Vegetation Land disturbance Models PnET-BGC (dynamic) MAGIC (dynamic) VSD (steady-state) Data Sets and Tools

  5. % Less than Ca

  6. BGC • Aqueous reactions • Surface reactions • Cation exchange • Adsorption • Humic binding • Aluminum dissolution/precipitation Wet Deposition Dry Deposition • Climatic data • Solar radiation • Precipitation • Temperature PnET Water balance Photosynthesis Living biomass Litterfall Net Mineralization Uptake Shallow water flow BGC – Surface water Aqueous reactions Deep water flow Weathering

  7. Model simulated median concentrations for lake chemistry and soil % BS at the 44 EMAP sites for pre-industrial and current conditions.

  8. The mean water concentrations from model for the 44 EMAP sites in 2000 and 2100 for three future scenarios. Values are expressed as ueq/L, except pH.

  9. N Immobilization N leaching = f(soil C:N) BC Exchange (Gapon or Gaines-Thomas) Very Simple Dynamic Model Atmospheric deposition Net nutrient uptake Biomass removal Rooting Zone Soil weathering Soil leaching

  10. Conclusions • Soils and surface waters in the Adirondacks have been impacted by acidic deposition • Databases, data layers and tools are available to facilitate critical load calculations • Regional scale applications of PnET-BGC have been conducted to quantify past and potential future response of soil and lakes to changes in acidic deposition • Preliminary efforts are underway to investigate critical load calculations in the Adirondacks

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