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November 1, 2000 Observations

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Start of Data Session

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HSRL Observations, November 1, 2000

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End of Data Session

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HSRL Data Products

**Plot of mean aerosol backscatter cross-section vs. altitude for data
session. **

The above figure shows the particulate scattering cross-section and
depolorization generated

from 3 minute averaged data with 165 meter vertical resolution. The
length of each bar represents

the mean of the scattering cross-sections measured during the data
collection period that have a

molecular scattering error < 2%. The scattering cross section is
computed using the measured

particulate backscatter cross section, ß`'`and an
estimated backscatter phase function of

P(180)/4pi=0.04. The value of .04 is derived from a 1 year climatology
of HSRL lidar data. The

approximate scattering cross section is then equal to: ß'/0.04. Each
bar is divided into colored

segments based on depolorization. The length of the segment is
determined by the fraction of the

measurements weighted by the scattering cross-section with a
depolorization of *d *< 0.15 (blue),

0.15 <*d* < 0.25(red), and *d *> 0.25 (yellow).
Depolorization less then 0.15 are generally water

droplets or aerosol. Depolorization greater then 0.25 are ice clouds.

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Radiosonde Profiles, November 1, 2000

UW Lidar // November 2, 2000 // root@lidar.ssec.wisc.edu