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Precipitation in light extinction reconstruction.

Patrick A Ryan1

  • 1Ryan Environmental, Scottsdale, AZ 85258, USA. pryan01@cox.net

Journal of the Air & Waste Management Association (1995)
|August 23, 2005
PubMed
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The U.S. Environmental Protection Agency

Area of Science:

  • Environmental science
  • Atmospheric chemistry
  • Air quality monitoring

Background:

  • The U.S. Environmental Protection Agency (EPA) established the Regional Haze Rule (RHR) in 1999.
  • The RHR aims for linear reduction of haze to natural background levels by 2064.
  • Visibility is assessed using the Interagency Monitoring of Protected Visual Environments (IMPROVE) formula.

Purpose of the Study:

  • To evaluate the accuracy of the IMPROVE formula in estimating visibility.
  • To assess the impact of precipitation on visibility estimations.
  • To refine visibility predictions by incorporating precipitation's light extinction coefficient.

Main Methods:

  • Utilized data from the IMPROVE network (1994-2002).
  • Calculated the light extinction coefficient using aerosol chemical concentrations.

Related Experiment Videos

  • Estimated the light extinction coefficient of precipitation and integrated it into visibility models.

    • Main Results:

    • The IMPROVE formula underestimated measured light scattering by 700 Mm(-1) on precipitation days.
    • Precipitation frequency was similar on clearest and haziest days.
    • Incorporating precipitation's light extinction significantly reduced projected visibility improvements.

    Conclusions:

    • The standard IMPROVE formula inadequately accounts for precipitation's effect on visibility.
    • Visibility improvements predicted under the Clean Air Act Amendments may be overestimated.
    • Accurate visibility assessment requires accounting for the optical effects of precipitation.