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Estimating background precipitation quality from network data.

B B Hicks1, R S Artz

  • 1National Oceanic and Atmospheric Administration, Air Resources Laboratory, 1325 East West Highway, Silver Spring, Maryland 20910, USA.

Environmental Pollution (Barking, Essex : 1987)
|January 1, 1992
PubMed
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Determining natural acid rain levels is challenging. Analysis of North American precipitation data suggests a natural background pH range of 5.0-5.3, unaffected by industrial pollution.

Area of Science:

  • Environmental Chemistry
  • Atmospheric Science
  • Acid Rain Research

Background:

  • Evaluating acid rain control strategies requires understanding natural precipitation chemistry.
  • Estimating natural background levels is crucial for assessing the impact of industrial emissions.
  • Existing methods for estimating natural background (remote measurements, simulations, data analysis) have limitations.

Purpose of the Study:

  • To determine the natural background pH of precipitation in North America.
  • To analyze existing precipitation chemistry data to infer pre-industrial conditions.
  • To establish a reliable baseline for acid rain impact assessments.

Main Methods:

  • Utilized event precipitation chemistry data from North America.
  • Focused on analyzing contemporary data to infer natural background levels.

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  • Examined historical data, acknowledging its contamination by industrial emissions.

    • Main Results:

    • The analysis revealed site-specific background pH levels.
    • A consistent natural background pH range of 5.0-5.3 was identified across different locations.
    • This range is independent of current industrial (or societal) emissions.

    Conclusions:

    • The natural background pH of precipitation in North America falls within the 5.0-5.3 range.
    • This finding provides a critical reference point for evaluating acid rain control strategies.
    • Understanding natural deposition is essential for accurate environmental impact assessments.