Editorial Type:
Article
Article Type:
Research Article

Cirrus Cloud Properties Derived from POLDER-1/ADEOS Polarized Radiances: First Validation Using a Ground-Based Lidar Network

Hélène Chepfer Laboratoire de Météorologie Dynamique, École Polytechnique, Palaiseau, France

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Philippe Goloub Laboratoire d’Optique Atmosphérique, Université Lille 1, Villeneuve d’Ascq, France

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James Spinhirne NASA Goddard Space Flight Center, Greenbelt, Maryland

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Pierre H. Flamant Laboratoire de Météorologie Dynamique, École Polytechnique, Palaiseau, France

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Mario Lavorato CEILAP, Villa Martelli, Argentina

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Laurent Sauvage Laboratoire de Météorologie Dynamique, École Polytechnique, Palaiseau, France

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Gérard Brogniez Laboratoire d’Optique Atmosphérique, Université Lille 1, Villeneuve d’Ascq, France

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Jacques Pelon Service d’Aéronomie, Université Paris 6, Paris, France

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Print Publication:
01 Feb 2000
DOI:
https://doi.org/10.1175/1520-0450(2000)039<0154:CCPDFP>2.0.CO;2
Page(s):
154–168
Restricted access

Abstract

Bidirectional polarized reflectances measured with the POLDER-1 instrument on board Advanced Earth Observing Satellite-1 have been used to infer cloud altitude and thermodynamical phase (ice/liquid) at a global scale. This paper presents a validation of these properties for cirrus clouds. The validation presented here is based on comparisons between POLDER-1 retrievals and measurements collected with a ground-based lidar network. The scale differences between POLDER measurements and lidar data are treated by selecting homogeneous and stable cloud layers.

These comparisons show that the cloud altitude retrieval with POLDER is valid for optically thick cloud, and nonvalid for semitransparent and thin cirrus clouds. The limitations of the cloud altitude retrieval method are analyzed by using both comparisons between POLDER and lidar and simulations of the bidirectional polarized reflectances performed with a radiative transfer code to assess a threshold of validity of the POLDER retrieval method. The comparisons of lidar and POLDER data show that the cloud thermodynamical phase (ice/liquid) retrieval is satisfactory, and examples of cloud thermodynamical phase retrieval are presented as a function of cloud temperatures.

Corresponding author address: Dr. Hélène Chepfer, Laboratoire de Météorologie Dynamique, École Polytechnique, 91128 Palaiseau CEDEX, France.

Abstract

Bidirectional polarized reflectances measured with the POLDER-1 instrument on board Advanced Earth Observing Satellite-1 have been used to infer cloud altitude and thermodynamical phase (ice/liquid) at a global scale. This paper presents a validation of these properties for cirrus clouds. The validation presented here is based on comparisons between POLDER-1 retrievals and measurements collected with a ground-based lidar network. The scale differences between POLDER measurements and lidar data are treated by selecting homogeneous and stable cloud layers.

These comparisons show that the cloud altitude retrieval with POLDER is valid for optically thick cloud, and nonvalid for semitransparent and thin cirrus clouds. The limitations of the cloud altitude retrieval method are analyzed by using both comparisons between POLDER and lidar and simulations of the bidirectional polarized reflectances performed with a radiative transfer code to assess a threshold of validity of the POLDER retrieval method. The comparisons of lidar and POLDER data show that the cloud thermodynamical phase (ice/liquid) retrieval is satisfactory, and examples of cloud thermodynamical phase retrieval are presented as a function of cloud temperatures.

Corresponding author address: Dr. Hélène Chepfer, Laboratoire de Météorologie Dynamique, École Polytechnique, 91128 Palaiseau CEDEX, France.

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Journal of Applied Meteorology and Climatology

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