WMOD00298

• Title: Quantifying Ice Nucleation by Silver Iodide Aerosols
• Date: 5/1/1990
• State: CO
• Weather Modification - Doc Type: Report

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6.31 Experiment (symbols) and equivalent model simulation 184
(lines) cumulative ice formation versus temperature for
several in-cloud seeding experiments with AgI-AgCl
aerosols. Injections of 0.03~m aerosols (experiments 7288,
5787, 2589) are shown in plots (a) to (c), while 0.07~m
aerosol injections (experiments 7188, 2689) are shown in
-1
plots (d) and (e). Equivalent expansion updraft is 2.5 m s .

6.32 As in Figure 6.3l, but for AgI-AgCl-4NaCl aerosols. Panels 185
(a) to (c) are for 0.03~m aerosol injections (experiments
8088, 3689, 3489), and panels (d) to, (f) are for 0.07~m
aerosol injections (experiments 8188, 6188, 3589).

6.33 Model (solid lines) versus experimental (dashed lines) 189
thermodynamic and cloud quantities in warm cloud base
seeding experiment using polydisperse AgI-AgCl aerosols
-1
experiment 7488). Equivalent expansion updraft is 2.5 m s .

6.34 Cumulative (+) and differential (0) F values observed and 190
those predicted by new model formulations (lines) in clouds
seeded before formation near OOC with 0.03~m (a), 0.07~m
(b), and polydisperse (c) AgI-AgCl aerosols. Cooling rate
is approximately lOC min-1 for these 2.5 m s-l ascent
simulations (experiments 7688, 7588, 7488).

6.35 As in Figure 6.34, but for 0.03~m (a), 0.7pm (b), and 19l
polydisperse (c) AgI-AgCl-4NaCl aerosols (experiments 7988,
6488, 6688).

6.36 Comparison of contributions of various nucleation modes to 192
ice formation by polydisperse AgI-AgCl (a) and AgI-AgC1-
4NaCl (b) aerosols seeded before the formation of cloud at
OOC.

6.37 Model thermodynamic and cloud quantities for simulation of 196
below-cloud seeding of an orographic cloud with AgI-AgCl
aerosols. The ice signal is given L-1. The initial parcel
4 -1
concentrations were 10 L . A panel for average maximum
crystal dimension is included with the quantities
previously displayed for cloud chamber simulations.

6.38 Comparison of cumulative ice fractions formed versus 197
temperature in orographic seeding simulation using AgI-AgCl
aerosols or AgI-AgCl-4NaCl aerosols.

6.39 Model thermodynamic and cloud quantities for simulation of 199
below cloud seeding of a summertime cumulus cloud with AgI-
AgCl aerosols. Parcel initial conditions and updraft
characteristics are described in the text.

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