Abstract
Abstract Recently, 95-GHz Doppler radars have been developed to document microphysical and dynamical properties of nonprecipitating clouds. RALI (airborne radar and lidar) plans to associate a dual-beam 95-GHz Doppler radar and a backscattering lidar on the same airborne platform. In optically thin clouds, data from both instruments (looking at nadir) will be available and can be combined to retrieve the microphysical characteristics of the cloud particles size distribution. But in dense clouds the lidar signal is extinguished over a few tenths of meters, and reflectivity may be biased by along-path attenuation. Thus the sampling strategy anticipated by RALI is the dual beam; that is, the radar operates along two viewing angles: nadir and 40° fore. The fact that the along-path attenuation acts in a different way along the two viewing angles is exploited by means of two algorithms (“stereoradar” and “dual beam”) allowing to retrieve the true (nonattenuated) reflectivity Z and the specific attenuation K. In...
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