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Applied Optics

Applied Optics


  • Vol. 41, Iss. 6 — Feb. 20, 2002
  • pp: 991–1011

Sensitivity and information content of aerosol retrievals from the Advanced Very High Resolution Radiometer: radiometric factors

Alexander Ignatov  »View Author Affiliations

Applied Optics, Vol. 41, Issue 6, pp. 991-1011 (2002)

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The sensitivity of aerosol optical depths τ1 and τ2 derived from the Advanced Very High Resolution Radiometer (AVHRR) channels 1 and 2, centered at λ1 = 0.63 and λ2 = 0.83 µm, respectively, and of an effective Ångstrom exponent α, derived therefrom as α = -ln(τ12)/ln(λ12), to calibration uncertainties, radiometric noise, and digitization is estimated. Analyses are made both empirically (by introduction of perturbations into the measured radiances and estimation of the respective partial derivatives) and theoretically (by use of a decoupled form of the single-scattering approximation of the radiative transfer equation). The two results are in close agreement. The errors, Δτ i and Δα i , are parameterized empirically as functions of τ i , radiometric errors, and Sun and view geometry. In particular, the α errors change in approximately inverse proportion to τ and are comparable with, or even exceed, typical α signals over oceans when τ < 0.25. Their detrimental effect on the information content of the AVHRR-derived size parameter gradually weakens as τ increases.

© 2002 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(010.1310) Atmospheric and oceanic optics : Atmospheric scattering
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(280.1100) Remote sensing and sensors : Aerosol detection
(280.1310) Remote sensing and sensors : Atmospheric scattering

Original Manuscript: March 12, 2001
Revised Manuscript: October 3, 2001
Published: February 20, 2002

Alexander Ignatov, "Sensitivity and information content of aerosol retrievals from the Advanced Very High Resolution Radiometer: radiometric factors," Appl. Opt. 41, 991-1011 (2002)

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