Retrieving the fraction of quazi-horizontally oriented ice crystals from a Raman lidar and a ceilometer
A.V. Konoshonkin1,2, N.V. Kustova1, A.G. Borovoi1,2, J. Reichardt3
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Scienc, 1, Academician Zuev square, Tomsk, 634021, Russia
2National Research Tomsk State University, 36, Lenin Avenue, Tomsk, 634050,Russia
3Richard-AОІmann-Observatorium, DWD, Lindenberg, Germany
Keywords: квазигоризонтально ориентированные пластинки, перистые облака, физическая оптика, рассеяние света, ледяные кристаллы, quazi-horizontally oriented ice plates, cirrus clouds, physical optics, light scattering, ice crystals
Abstract
The study shows the results of retrieving the fraction of quazi-horizontally oriented ice plates in a cirrus cloud of randomly oriented ice columns from the data of simultaneously sounding Raman lidar and ceilometer. It is show that in the case of absence of a layer of quasi-horizontally oriented particles the perpendicular and parallel components of the backscatter coefficient of vertically oriented Raman lidar coincide up to a constant factor with the backscatter coefficient of 5° inclined ceilometer. If quazi-horizontally oriented plates appear in a cloud, the fraction of the plates and the flutter angle can be retrieved from the difference of the backscattering coefficient profiles with help of the extinction coefficient profile.
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