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Applied Optics

Applied Optics


  • Vol. 28, Iss. 7 — Apr. 1, 1989
  • pp: 1320–1326

Aerosol analysis with the Coastal Zone Color Scanner: a simple method for including multiple scattering effects

Howard R. Gordon and Diego J. Castaño  »View Author Affiliations

Applied Optics, Vol. 28, Issue 7, pp. 1320-1326 (1989)

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For measurement of aerosols over the ocean, the total radiance Lt backscattered from the top of a stratified atmosphere which contains both stratospheric and tropospheric aerosols of various types has been computed. A similar computation is carried out for an aerosol-free atmosphere yielding the Rayleigh scattered radiance Lr. The difference LtLr is shown to be linearly related to the radiance Las, which the aerosol would produce in the single scattering approximation. This greatly simplifies the application of aerosol models to aerosol analysis by satellite since adding to, or in some way changing, the aerosol model requires no additional multiple scattering computations. In fact, the only multiple computations required for aerosol analysis are those for determining Lr, which can be performed once and for all. The computations are explicitly applied to Band 4 of the CZCS, which, because of its high radiometric sensitivity and excellent calibration, is ideal for studying aerosols over the ocean. Specifically, the constant A in the relationship Las = A−1 (LtLr) is given as a function of position along the scan for four typical orbital–solar position scenarios. The computations show that Las can be retrieved from LtLr with an average error of no more than 5–7% except at the very edges of the scan.

© 1989 Optical Society of America

Original Manuscript: July 15, 1988
Published: April 1, 1989

Howard R. Gordon and Diego J. Castaño, "Aerosol analysis with the Coastal Zone Color Scanner: a simple method for including multiple scattering effects," Appl. Opt. 28, 1320-1326 (1989)

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  27. One scan line of the CZCS contains 1968 pixels corresponding to a rotation of the scan mirror through a total angle of 78.72°. However, while the instrument field of view is 0.0495°, the pixel sample rate is 1 per 0.04°, so there is an ~25% overlap between adjacent pixels. Pixel 246 from the eastern edge of the scan corresponds to a position where the scan mirror has been rotated 30° from the subsatellite track toward the east.
  28. However, over the open ocean, where the pigment concentration is sufficiently low, the water-leaving radiance (known to be <1 DC in Band 4) is known in Bands 2 and 3.16 This may allow derivation of the above mentioned combination as a function of wavelength which could provide a means of proceeding with a reduced dependence on models or provide guidance in choosing models.
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