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Applied Optics

Applied Optics


  • Vol. 38, Iss. 12 — Apr. 20, 1999
  • pp: 2616–2624

Backscattering measurements of atmospheric aerosols at CO2 laser wavelengths: implications of aerosol spectral structure on differential-absorption lidar retrievals of molecular species

Avishai Ben-David  »View Author Affiliations

Applied Optics, Vol. 38, Issue 12, pp. 2616-2624 (1999)

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The volume backscattering coefficients of atmospheric aerosol were measured with a tunable CO2 lidar system at various wavelengths in Utah (a desert environment) along a horizontal path a few meters above the ground. In deducing the aerosol backscattering, a deconvolution (to remove the smearing effect of the long CO2 lidar pulse and the lidar limited bandwidth) and a constrained-slope method were employed. The spectral shape β(λ) was similar for all the 13 measurements during a 3-day period. A mean aerosol backscattering-wavelength dependence β(λ) was computed from the measurements and used to estimate the error Δ(CL) (concentration–path-length product) in differential-absorption lidar measurements for various gases caused by the systematic aerosol differential backscattering and the error that is due to fluctuations in the aerosol backscattering. The water-vapor concentration–path-length product CL and the average concentration C = 〈CL〉/L for a path length L computed from the range-resolved lidar measurements is consistently in good agreement with the water-vapor concentration measured by a meteorological station. However, I was unable to deduce, reliably, the range-resolved water-vapor concentration C(r), which is the derivative of the range-dependent product CL, because of the effect of residual noise caused mainly by errors in the deconvolved lidar measurements.

© 1999 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(280.1310) Remote sensing and sensors : Atmospheric scattering
(280.1910) Remote sensing and sensors : DIAL, differential absorption lidar
(280.3640) Remote sensing and sensors : Lidar
(290.1350) Scattering : Backscattering
(290.5820) Scattering : Scattering measurements

Original Manuscript: September 11, 1998
Revised Manuscript: January 4, 1999
Published: April 20, 1999

Avishai Ben-David, "Backscattering measurements of atmospheric aerosols at CO2 laser wavelengths: implications of aerosol spectral structure on differential-absorption lidar retrievals of molecular species," Appl. Opt. 38, 2616-2624 (1999)

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