In the present report, results of the experiment on polarization laser sensing of contrails performed for one and a half days are discussed. The altitudes of boundaries of the aerosol layers, their backscattering matrices, optical thicknesses, and scattering ratios are determined. The vertical profiles of lidar returns are analyzed. The results are compared with the meteorological data at the altitudes of formation of high-level clouds.
Determining the aerosol microphysical properties is an important scientific and applied problem. In practice, most often the interpretation of lidar data is based on the laser sensing equation, which is valid for media with a small optical thickness. During sensing of optically dense formations, it is necessary to take into account the contribution of multiple scattering to the lidar return. In addition to significant attenuation, multiple scattering leads to the depolarization of radiation. The purpose of the present report is to discuss the effect of the polarization state of sensing radiation on its extinction in water-milk suspension.
A complex experiment on the investigation of radiation characteristics of cirrus is performing since 2016. In the experiment, solar radiation fluxes are measured near the Earth’s surface and the orientation degree of ice crystals in cirrus is estimated using a polarization lidar. Results of the experiment are discussed. Significant effect of the orientation degree of cirrus particles on the transmission of solar radiation is found in a number of experiments.
The results of the investigation of radiation characteristics of cirrus consisting of crystalline ice particles with a preferred orientation are discussed. The orientation degree of particles is estimated from the backscattering phase matrices, which are determined with the high-altitude polarization lidar developed at National Research Tomsk State University. It is shown that the orientation of ice crystals in clouds with anomalously high backscattering affects significantly the transmission of solar radiation.
Multiple-field-of-view (MFOV) lidar is an effective tool for sensing of optical dense aerosol formation. As is well known, the size and phase composition of cloud particles effect on characteristics of double scattering lidar signal. This work focuses on research of informativeness of multiple scattering lidar signal. The results of the numerical simulation of the ratio of polarization degrees (circular and linear) of double scattering lidar return from droplet clouds with different particles size distribution are presented in this paper.
Results of complex experiments, in which flows of solar radiation are measured near the Earth’s surface in the presence of cirrus cloudiness and the orientation degree of ice crystals in cirrus is estimated using a polarization lidar, are discussed. Significant effect of the orientation degree of cirrus particles on the transmission of solar radiation is found in a number of experiments.
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