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Light absorption by black sand dust.

J C Chow1, D H Lowenthal, J G Watson

  • 1Atmospheric Sciences Division, Desert Research Institute, 2215 Raggio Parkway, Reno, Nevada 89512-1095, USA. judyc@dri.edu

Applied Optics
|March 20, 2008
PubMed
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Hawaiian black sand aerosols were studied for light absorption. Researchers determined the imaginary part of the refractive index to be 0.014, crucial for understanding aerosol optical properties.

Area of Science:

  • Atmospheric Science
  • Geochemistry
  • Optical Physics

Background:

  • Aerosols, particularly those derived from natural sources like volcanic sand, significantly influence Earth's radiative balance.
  • Understanding the optical properties of aerosols is critical for climate modeling and air quality assessments.
  • Hawaiian black sand aerosols represent a unique source of mineral dust with distinct optical characteristics.

Purpose of the Study:

  • To quantify the light absorption properties of fine and coarse aerosols originating from Hawaiian black sand.
  • To determine the real and imaginary parts of the refractive index for these aerosols.
  • To correct measured absorption coefficients for multiple scattering effects.

Main Methods:

  • Light transmission measurements were employed to determine aerosol light absorption.

Related Experiment Videos

  • The real part of the refractive index was measured directly, while the imaginary part was estimated.
  • Mie theory was utilized to estimate absorption-to-extinction ratios for correcting multiple scattering artifacts.

    • Main Results:

    • The optimal imaginary part of the refractive index for best agreement between calculated and measured absorption coefficients was found to be 0.014.
    • Adjusted light absorption coefficients (B(ap)) for fine and coarse aerosols were determined.
    • Absorption efficiencies for fine and coarse black sand aerosols were calculated as 0.22 m(2)/g and 0.09 m(2)/g, respectively.

    Conclusions:

    • The study successfully quantified the light absorption of Hawaiian black sand aerosols.
    • The determined imaginary refractive index (0.014) is a key parameter for modeling the climate impact of these aerosols.
    • The findings provide essential optical property data for atmospheric models incorporating mineral dust aerosols.