Lidar depolarization studies of the atmosphere at the South Pole.

Some examples of lidar backscatter and depolarization profiles obtained at the South Pole during the austral summer period 1976-77 are presented. The examples illustrate the variety of data obtainable from various meteorological conditions as well as how this kind of lidar can help determine cloud layer structures in the polar atmosphere. Clear sky ice crystal precipitation and light ice precipitation under overcast sky conditions produced volume backscatter coefficients in the 2-4 x 10(-3)-km(-1) range and depolarization values up to 0.46, while mixed phase and supercooled water drop layers were also observed with maximum backscatter coefficients ranging from 5 x 10(-2) to 2.4 x 10(-1) km(-1) and depolarization values from a few to ~20%. Some of these layers may have contained aligned plates which resulted in enhanced backscatter values and lower depolarization values, therefore, the identification is sometimes ambiguous.

[1]  Kenneth Sassen,et al.  Observations by Lidar of Linear Depolarization Ratios for Hydrometeors. , 1971 .

[2]  K. Sassen.  Air-Truth Lidar Polarization Studies of Orographic Clouds , 1978 .

[3]  J. S. Ryan,et al.  Laser backscattering from dense water-droplet clouds , 1979 .

[4]  Kenneth Sassen,et al.  Ice Crystal Habit Discrimination with the Optical Backscatter Depolarization Technique , 1977 .

[5]  Kuo-Nan Liou,et al.  Multiple backscattering and depolarization from water clouds for a pulsed lidar system , 1971 .

[6]  N. L. Abshire,et al.  Depolarization of Lidar Returns from Virga and Source Cloud , 1976 .

[7]  S. Pal,et al.  Polarization properties of lidar backscattering from clouds. , 1973, Applied optics.

[8]  A I Carswell,et al.  Polarization properties of lidar scattering from clouds at 347 nm and 694 nm. , 1978, Applied optics.

[9]  C. Platt,et al.  Lidar Observation of a Mixed-Phase Altostratus Cloud , 1977 .

[10]  S. R. Pal,et al.  The Polarization Characteristics of Lidar Scattering from Snow and Ice Crystals in the Atmosphere , 1977 .

[11]  S. Pal,et al.  Multiple scattering in atmospheric clouds: lidar observations. , 1976, Applied optics.

[12]  A. Carswell,et al.  Lidar polarization studies of the troposphere. , 1975, Applied optics.

[13]  Vern N. Smiley,et al.  Lidar Determinations of Atmospheric Ice Crystal Layers at South Pole during Clear-Sky Precipitation , 1980 .

[14]  A. Hogan.  Summer Ice Crystal Precipitation at the South Pole , 1975 .