aerosol optical depth"The optical depth due to extinction by the aerosol component of the atmosphere. Aerosol optical depths typically decrease with increasing wavelength and are much smaller for longwave radiation than for shortwave radiation.
aerosol Angstrom coefficientOften incorrectly used synonymously with "aerosol Angstrom exponent", but should instead refer to the aerosol optical depth at the reference wavelength (1 um) in Angstrom’s power-law representation.
optical thickness (optical depth) In calculating the transfer of radiant energy, the mass of an absorbing or emitting material lying in a vertical column of unit cross-sectional area and extending between two specified levels.
 See also: Cloud, Radiation, Temperature, Wavelength, Light
  
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