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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Cloud/radiation interaction
  • Computational Geophysics: Neural networks, fuzzy logic, machine learning
  • Atmospheric Processes: Remote sensing

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L13807, 4 PP., 2005
doi:10.1029/2005GL022791

Case study of inhomogeneous cloud parameter retrieval from MODIS data

Céline Cornet

Laboratoire d'Optique Atmosphérique UMR CNRS 8518, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, France

Jean-Claude Buriez

Laboratoire d'Optique Atmosphérique UMR CNRS 8518, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, France

Jérôme Riédi

Laboratoire d'Optique Atmosphérique UMR CNRS 8518, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq, France

Harumi Isaka

Laboratoire de Météorologie Physique UMR CNRS 6016, Université Blaise Pascal, Aubière, France

Bernard Guillemet

Laboratoire de Météorologie Physique UMR CNRS 6016, Université Blaise Pascal, Aubière, France

Cloud parameter retrieval of inhomogeneous and fractional clouds is performed for a stratocumulus scene observed by MODIS at a solar zenith angle near 60°. The method is based on the use of neural network technique with multispectral and multiscale information. It allows to retrieve six cloud parameters, i.e. pixel means and standard deviations of optical thickness and effective radius, fractional cloud cover, and cloud top temperature. Retrieved cloud optical thickness and effective radius are compared to those retrieved with a classical method based on the homogeneous cloud assumption. Subpixel fractional cloud cover and optical thickness inhomogeneity are compared with their estimates obtained from 250m pixel observations; this comparison shows a fairly good agreement. The cloud top temperature appears also retrieved quite suitably.

Received 22 February 2005; accepted 18 May 2005; published 6 July 2005.

Citation: Cornet, C., J.-C. Buriez, J. Riédi, H. Isaka, and B. Guillemet (2005), Case study of inhomogeneous cloud parameter retrieval from MODIS data, Geophys. Res. Lett., 32, L13807, doi:10.1029/2005GL022791.

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