Abstract
Since 2010, the Raman dual-FOV lidar system permits the retrieval of microphysical properties of liquid-water clouds during nighttime. A new robust lidar depolarization approach was recently introduced, which permits the retrieval of these properties as well, with high temporal resolution and during daytime. To implement this approach, the lidar system was upgraded, by adding a three channel depolarization receiver. The first preliminary retrieval results and a comparison between both methods is presented.
Highlights
The research on aerosol-cloud interaction [1] has intensified during the last years
By measuring the nitrogen Raman signal returns with two FOVs, the retrieval of the single scattering extinction coefficient and the effective radius in thin layered liquid water clouds is possible [4, 5]
For a deep statistical analysis, much more measurements are required, and since the dual-FOV is limited to nighttime measurements, an alternative method to extend the measurements to the daytime is needed
Summary
Large uncertainties in the aerosol impact on liquid-water cloud evolution exist. To characterize this influence, accurate and simultaneous observations of the microphysical properties of the clouds and of aerosols below the clouds base are needed. By measuring the nitrogen Raman signal returns with two FOVs, the retrieval of the single scattering extinction coefficient and the effective radius in thin layered liquid water clouds is possible [4, 5]. A robust optimal estimation procedure to retrieve this microphysical properties from lidar depolarization measurements was developed [6]. This is an innovative application, carrying on with previous work with the dual FOV techniques developed in the same group. Two different lidar-based methods to study the microphysics of liquid-water clouds are integrated in one lidar system, making possible a preliminary comparison of both methods in terms of the retrieved cloud microphysical and optical properties
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