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Last modified
7/28/2009 2:35:54 PM
Creation date
4/15/2008 2:39:22 PM
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Weather Modification
Project Name
Sierra Cooperative Pilot Project
Title
A Comparison of Seeded and Nonseeded Orographic Cloud Simulations with and Explicit Cloud Model
Prepared By
Michael P. Meyers, Paul J. DeMott and William R. Cotton
Date
4/4/1995
Weather Modification - Doc Type
Report
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<br />APRIL 1995 <br /> <br />MEYERS ET AL. <br /> <br />843 <br /> <br />90 <br /> <br />(0) <br /> <br />85 <br /> <br /> <br /> <br />80 <br /> <br />75 <br /> <br />E <br />.:It: <br /> <br />70 <br /> <br />>- <br /> <br />65 <br /> <br />o <br /> <br />60 <br /> <br />55 <br /> <br />100 105 110 115 120 125 130 135 140 <br />X (km) <br /> <br />(c) <br /> <br /> <br />90 <br /> <br />85 <br /> <br />80 <br /> <br />75 <br /> <br />E <br />.:It: <br /> <br />70 <br /> <br />>- <br /> <br />65 <br /> <br /> <br />60 <br /> <br />55 <br /> <br />100 105 110 115 120 125 130 135 140 <br />X (km) <br /> <br />90 <br /> <br />(b) <br /> <br />85 <br /> <br /> <br />80 <br /> <br />75 <br /> <br />E <br />.:It: <br /> <br />70 <br /> <br />>- <br /> <br />65 <br /> <br />60 <br /> <br />55 <br /> <br />100 105 110 115 120 125 130 135 140 <br />X (km) <br /> <br />90 <br /> <br />(d) <br /> <br />85 <br /> <br />C/O <br /> <br />80 <br /> <br />75 <br /> <br />E <br />.:It: <br /> <br />70 <br /> <br />>- <br /> <br />65 <br /> <br />60 <br /> <br />55 <br /> <br />\00 105 110 115 120 125 130 135 140 <br />X ( km) <br /> <br />FIG. 7. The simulated pristine ice crystal concentrations for the seeded run at 3000 m MSL on grid 3 at (a) 1920, (b) 1940, and (c) 2000 <br />UTC, with a contour interval of20 L-1. (d) Pristine ice crystal concentrations from the nonseeded run at 2000 UTC with-a" contour interval <br />of5 L-'. <br /> <br />with peak values of 0.05 g kg-I, more than double the <br />values predicted in the nonseeded run. The aggregate <br />mixing ratio maximum (not shown) was produced <br />downstream of the pristine ice mixing ratio peak, with <br />peak values in the seeded run of 0.02 g kg-I. The non- <br />seeded run produced negligible aggregation at this ver- <br />tical level. <br />Since the exact location and times of the observed <br />seed releases were different than the one seed release <br />in the numerical experiment, spatial verification of the <br />observed precipitation distribution was not considered. <br /> <br />However, comparisons between the seeded and non- <br />seeded precipitation distributions demonstrating the <br />sensitivity of the seeding was examined. Figure 10 <br />shows the precipitation difference between the seeded <br />simulation and the nonseeded simulation by 2200 <br />UTe. Differences in the precipitation amounts between <br />the two runs showed that for this case, the increases <br />due to the cloud seeding did not necessarily take pre- <br />cipitation from another location. Only one small area <br />of minima occurred that had more precipitation in the <br />nonseeded run than the seeded run. Simulated precip- <br />
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