WMOD00462

• Contract/Permit #: 87-1999
• Title: Development of Empirical Equations of Ice Crystal Growth Microphysics for Modeling Analysis - Final Report
• Date: 9/1/1988
• Weather Modification - Doc Type: Report

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tends to generate more crystals in the jug, and, thus, enhances the
competition at lower temperatures. This effectively stops the crystal growth
associated with the seeding technique and competition before injecting the
crystals into the suspension chamber, but the crystal size is not necessarily the
same every time although uncertainty arising from this factor may not be
large. However, the importance of this uncertainty rapidly decreases as the
growth time increases. Thus, time as well as temperature can be factors that
affect the starting time to some extent.
The sensitivity of temperature on the measured quantities, mass,
dimensions and fall velocity, has significant implications on the certainty of
the results. Mass and axial ratio can have a particularly large variation with
small temperature changes; temperature changes as small as lOC can double
the magnitude of these quantities, which will be shown in temperature plots
later in this thesis. Thus, temperature sensitivity can account for a large part
of the differences between the results from. each experimental study.
In summary, the chronological order of the performed experiments, the
time after seeding, the ambient or fog temperature and temperature
sensitivity are important factors in estimating the experimental uncertainties
and reliability of each data set to be used in this thesis. These factors in
addition to those discussed in the first part of this chapter can help resolve
some of the internal and external inconsistencies of each data set. Thus,
despite some drawbacks, these data sets will be useful in this thesis.

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