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<br />. <br /> <br />must exist over 10 perc:ent or more of the 20 nm flight leg <br />flown at -8oC (Vardiman, et al., 1982). The five variables <br />for which"information is provided are: liquid water content, <br />IDC crystal concentration, 2DC crystal concentration, 2DP <br />crystal concentration, and 2DC ice water content. The first <br />variable is observed by the Johnson-Williams liquid water <br />detector and the last four variables are from Particle Measurement <br />Syst ems (PMS r""probes. 'rable 2.1 contains mean values of these <br />variables in seeded and not seeded data sets after seeding <br />(T = 0 is time of seeding) and ratios of seed to no seed. <br />Table 2.2 presents similar information for differences in <br />the seeded and not seeded data sets normalized to ~bservations <br />taken at T=O. Figures 2.1 through 2.4 present plots of the <br />first four variables from Table 2.1. <br /> <br />. <br /> <br />. <br /> <br />. <br />':f <br /> <br />. <br /> <br />Figure 2.1 indicates the not seeded clouds had more liquid <br />water at the time of seeding and that this difference decreased <br />with time following seeding. This difference was statistically <br />significant at 0 and 3 minutes but was not thereafter, suggesting <br />a bias in the seed and not seed samples not due to seeding. <br />In Figure 2.2 the IDC concentrations were similar at T=O but <br />the seeded samples showed a strong response with statistical <br />support that appears related to seeding. Likewise, the 2DC <br />concentrations in Figure 2.3 indicate a strong seeding signal <br />to 18 minutes following seeding with statistical support. <br />A similar pattern is demonstrated in the 2DP concentrations <br />with statistical significance. It is evident from these data <br />that seeding signatures should be observable in the SCPP-l <br />experiment in the most seedable class A clouds out to at least <br />18 minutes, following seeding. Differences beyond this time <br />frame do not appear to be documented. <br /> <br />. <br /> <br />. <br />'"' <br /> <br />. <br /> <br />. <br /> <br />2-2 <br /> <br />. <br /> <br />. <br />