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Atmospheric aerosol: does a background level exist?

W M Porch, R J Charlson, L F Radke

    Science (New York, N.Y.)
    |October 16, 1970
    PubMed
    Summary
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    Light-scattering measurements from remote locations agree, suggesting a consistent global aerosol background. This indicates a stable atmospheric aerosol layer exists worldwide.

    Area of Science:

    • Atmospheric Science
    • Environmental Monitoring
    • Aerosol Physics

    Background:

    • Understanding atmospheric aerosols is crucial for climate and air quality.
    • Previous measurements of light-scattering and turbidity have shown variability.
    • Establishing a baseline aerosol level is important for detecting changes.

    Purpose of the Study:

    • To investigate the consistency of light-scattering measurements in remote environments.
    • To determine if a universal background aerosol level exists.
    • To validate the concept of a global atmospheric aerosol background.

    Main Methods:

    • Utilized an integrating nephelometer for light-scattering measurements.
    • Conducted measurements at two distinct remote locations: Point Barrow, Alaska, and Mount Olympus, Washington.

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  • Compared results with existing light-scattering and turbidity data from other remote sites.

    • Main Results:

    • Light-scattering measurements from Point Barrow and Mount Olympus showed agreement in magnitude.
    • These measurements were consistent with other remote aerosol and turbidity data.
    • The findings support the existence of a stable background aerosol level.

    Conclusions:

    • A consistent background level of atmospheric aerosol is supported by the data.
    • The concept of a global aerosol background is applicable and measurable.
    • These findings have implications for climate modeling and atmospheric transport studies.