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Proceedings Article

Ocean-color remote sensing through clouds

[+] Author Affiliations
Robert Frouin

Scripps Institution of Oceanography, Univ. of California San Diego

Pierre-Yves Deschamps, Jean-Marc Nicolas

Univ. des Sciences et Technologies de Lille (France)

Philippe Dubuisson

Univ. du Littoral Cote d'Opale (France)

Proc. SPIE 5885, Remote Sensing of the Coastal Oceanic Environment, 588504 (September 10, 2005); doi:10.1117/12.621055
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From Conference Volume 5885

  • Remote Sensing of the Coastal Oceanic Environment
  • Robert J. Frouin; Marcel Babin; Shubha Sathyendranath
  • San Diego, California, USA | July 31, 2005


Ocean-color remote sensing from space is currently limited to cloud-free areas. Consequently, the daily ocean coverage is 15-20%, and weekly products show no information in many areas. This limits considerably the utility of satellite ocean color observations for operational oceanography. Global coverage is required every three to five days in the open ocean and at least every day in the coastal zone. In view of the requirements for spatial coverage, and of the effects of clouds on observations of ocean color, an algorithm is proposed to estimate marine reflectance in the presence of a thin or broken cloud layer. The algorithm's theoretical basis is that cloud reflectance at some near-infrared wavelength may be accurately extrapolated to shorter wavelengths, whatever the cloud geometry, without any additional information. The interaction between cloud droplets and molecules, in particular, follows a λ-4 law. On the contrary, estimating aerosol scattering requires at least a measurement of its spectral dependence. Applying the algorithm to actual satellite ocean color imagery, a substantial gain in ocean coverage is obtained. The oceanic features retrieved below the clouds exhibit continuity with the adjacent features in clear areas. The daily ocean coverage is expected to be increased to up to 50% with the proposed algorithm, allowing one to resolve better phytoplankton blooms in the open ocean and "events" linked to wind forcing in the coastal zone. This could lead to important new information about the temporal variability of biological processes.

© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Robert Frouin ; Pierre-Yves Deschamps ; Jean-Marc Nicolas and Philippe Dubuisson
"Ocean-color remote sensing through clouds", Proc. SPIE 5885, Remote Sensing of the Coastal Oceanic Environment, 588504 (September 10, 2005); doi:10.1117/12.621055; http://dx.doi.org/10.1117/12.621055

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