Optical and geometrical properties of northern midlatitude cirrus clouds observed with a UV Raman Lidar

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Abstract

Measurements of cirrus optical and geometrical properties of are presented. Data have been taken at Geesthacht (53.5 °N, 10.5 °E) in northern Germany between May 1994 and March 1996. The instrument used for this purpose is a two-laser UV Raman DIAL for simultaneous and independent measurements of ozone, water vapor and clouds. The combination of the Raman lidar technique and the polarization lidar technique yields the most complete set of cirrus cloud parameters measured remotely so far. A statistical analysis of cirrus midcloud height and temperature, top height and temperature, and of cirrus geometrical and optical depth is presented and discussed. The cloud mean extinction, geometrical and optical depths, lidar ratio and depolarization ratio are given as a function of midcloud temperature. For the first time the dependence of the lidar ratio upon the depolarization ratio is investigated. The material presented is considered as an important data basis for the modeling of the effects of cirrus clouds on climate.

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Reichardt, J. (1999). Optical and geometrical properties of northern midlatitude cirrus clouds observed with a UV Raman Lidar. Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, 24(3), 255–260. https://doi.org/10.1016/S1464-1909(98)00047-1

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