WMOD00275

• Contract/Permit #: 85-5071
• Title: Cooperative Weather Modification Research Program - 1985 Analysis Plan
• Date: 1/1/1985
• State: UT
• Weather Modification - Doc Type: Report

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The analysis leading to the second objective will be based on Iidar
data collected in the zenith-pointing mode. The Iidar then observes the
height and frequency of any liquid water in the clouds overhead. The
height can be converted to temperature using rawinsonde data. Time-
height diagrams will be made of the depolarization ratio data, and they
will show how the vertical I'Dcation of the liquid water evolves with
time. Interpretation of thes,e diagrams requires some care so as to
separate advective and temporal changes. The radar and radiometer data
collected upwind of the lidar may help in the interpretation by showing
whether liquid water is advect:ing overhead.
The analysis leading to the third objective will be based on tabu-
lations of supercooled liquid water content and flux measured with the
detector, the state of riming of precipitation particles sampled at the
detector site and at other loccltions on the Tushar Mtns, the integrated
amount of liquid water measu,"ed in directions approximately upwind of
the detector and surface observations sites by the radiometer, and the
height and temperature of liquid water observed with the lidar.
Comparative analysis of these data may reveal how representative of in-
cloud conditions are the detector and surface microphysics observations.
The degree of representativenE!ss may depend on the spatial homogeneity
of the liquid water field and on how much supercooled liquid water is
blowing across the Tushar Mtns and not utilized in the precipitation
process.

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