HSRL Observations, November 11, 1993

PostScript files for Aerosol Backscatter Cross-Section and Aerosol Depolarization

These observations show a water cloud at about 5.5 km with ice virga falling out, from 1:30 to 2:30 UT. We know the cloud is mostly water because of the low depolarization values (0.02 - 0.08), and the high backscatter cross-section values. Ice particles have much higher depolarization values, around 0.4, and is seen as the yellow color in the aerosol depolariztion figure.
Notice the cirrus cloud from 1:00 to 1:30 UT between 7 and 10 km. Also, notice the aerosol layers from the surface to about 3.8 km. The layers near the surface and the one from 2.3 to 3.8 km show higher depolarization values which indicates that they consist of non-spherical shaped particles. Note: the water cloud appears thin because the lidar signal is extinguished very soon into the cloud.

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UW Lidar // November 4, 1999 // eloranta@lidar.ssec.wisc.edu