Comparison of airborne in-situ, airborne radar-lidar, and spaceborne radar-lidar retrievals of polar ice cloud properties sampled during the POLARCAT campaign - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Atmospheric and Oceanic Technology Année : 2013

Comparison of airborne in-situ, airborne radar-lidar, and spaceborne radar-lidar retrievals of polar ice cloud properties sampled during the POLARCAT campaign

Julien Delanoë
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Olivier Jourdan
Jacques Pelon
Mathieu Papazzoni
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Régis Dupuy
Jean-François Gayet
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Caroline Jouan
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Résumé

This study illustrates the high potential of RALI, the French airborne radar-lidar instrument, for studying cloud processes and evaluating satellite products when we have satellite overpasses. We demonstrate, for an Arctic Nimbostratus ice cloud collected on 1 April 2008 during the POLARCAT campaign, the capability of this synergistic instrument to retrieve cloud properties and to characterize the cloud phase at scales smaller than a kilometer which is crucial for cloud process analysis. A variational approach, which combines radar and lidar, is used to retrieve IWC, extinction and effective radius. We show that the combination of radar and lidar provides better retrievals than stand-alone retrievals, and that in general the radar overestimates and the lidar underestimates IWC. As the sampled ice cloud was simultaneously observed by CloudSat and CALIPSO satellites, we show a new way to assess satellite cloud products by combining in-situ and active remote sensing measurements. It was then possible to compare RALI to three satellite ice cloud products: CloudSat, CALIPSO and DARDAR.
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Dates et versions

hal-00730535 , version 1 (10-12-2020)

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Julien Delanoë, Alain Protat, Olivier Jourdan, Jacques Pelon, Mathieu Papazzoni, et al.. Comparison of airborne in-situ, airborne radar-lidar, and spaceborne radar-lidar retrievals of polar ice cloud properties sampled during the POLARCAT campaign. Journal of Atmospheric and Oceanic Technology, 2013, 30 (1), pp.57-73. ⟨10.1175/JTECH-D-11-00200.1⟩. ⟨hal-00730535⟩
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