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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 3 — Jan. 20, 1999
  • pp: 451–455

Atmospheric Correction of Ocean Color Sensors: Computing Atmospheric Diffuse Transmittance

Menghua Wang  »View Author Affiliations


Applied Optics, Vol. 38, Issue 3, pp. 451-455 (1999)
http://dx.doi.org/10.1364/AO.38.000451


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Abstract

Using the reciprocal equation derived by Yang and Gordon [Appl. Opt. 36, 7887–7897 (1997)] for atmospheric diffuse transmittance of the ocean–atmosphere system, I examined the accuracy of an analytical equation proposed by Gordon et al. [Appl. Opt. 22, 20–36 (1983)] in computing the atmospheric diffuse transmittance for wavelengths from 412 to 865 nm for both a pure Rayleigh and a two-layer Rayleigh-aerosol atmosphere overlying a flat Fresnel-reflecting ocean surface. It was found that for viewing angles up to approximately 40°, the analytical formula produces errors usually between 2% and 3% for nonabsorbing and weakly absorbing aerosols and for aerosol optical thicknesses τa ≤ 0.4. The error increases with an increase in aerosol absorption, aerosol optical thickness, and viewing angle, and with the decrease of wavelength. By a simple numerical fit to modify the analytical formula, the atmospheric diffuse transmittance can be accurately computed usually to within ~1% (~0.5% in most cases) for a variety of aerosol models, aerosol optical thicknesses τa ≤ 0.6, viewing angles θ ≤ 60°, different aerosol vertical structure distribution, and for wavelengths from 412 to 865 nm.

© 1999 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.1320) Atmospheric and oceanic optics : Atmospheric transmittance
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(280.0280) Remote sensing and sensors : Remote sensing and sensors

Citation
Menghua Wang, "Atmospheric Correction of Ocean Color Sensors: Computing Atmospheric Diffuse Transmittance," Appl. Opt. 38, 451-455 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-3-451


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References

  1. H. R. Gordon and M. Wang, “Retrieval of water-leaving radiance and aerosol optical thickness over the oceans with SeaWiFS: a preliminary algorithm,” Appl. Opt. 33, 443–452 (1994).
  2. S. B. Hooker, W. E. Esaias, G. C. Feldman, W. W. Gregg and C. R. McClain, An Overview of SeaWiFS and Ocean Color, Vol. 1 of SeaWiFS Technical Report Series, NASA Tech. Memo. 104566 (NASA Goddard Space Flight Center, Greenbelt, Md., 1992).
  3. A. Morel and G. Gentili, “Diffuse reflectance of oceanic waters. III. Implication of bidirectionality for the remote-sensing problem,” Appl. Opt. 35, 4850–4862 (1996).
  4. H. Yang and H. R. Gordon, “Remote sensing of ocean color: assessment of water-leaving radiance bidirectional effects on atmospheric diffuse transmittance,” Appl. Opt. 36, 7887–7897 (1997).
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  6. H. R. Gordon, D. K. Clark, J. L. Mueller, and W. A. Hovis, “Phytoplankton pigments from the Nimbus-7 Coastal Zone Color Scanner: comparisons with surface measurements,” Science 210, 63–66 (1980).
  7. E. P. Shettle and R. W. Fenn, “Models for the aerosols of the lower atmosphere and the effects of humidity variations on their optical properties,” AFGL-TR-79–0214 (U.S. Air Force Geophysics Laboratory, Hanscom Air Force Base, Mass., 1979).
  8. C. Junge, “Atmospheric chemistry,” Adv. Geophys. 4, 1–108 (1958).

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