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Last modified
7/28/2009 2:40:21 PM
Creation date
4/24/2008 2:48:41 PM
Metadata
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Template:
Weather Modification
Contract/Permit #
14-06-D-5640
Project Name
Park Range Atmospheric Resources Program
Title
Park Range Atmospheric Resources Program - Final Report
Date
9/30/1969
Weather Modification - Doc Type
Report
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<br />~' ~} <br /> <br />.OGRAM <br /> <br />V. ANALYSIS <br /> <br />[j <br /> <br /> <br />;9 <br />~5 <br />:7 <br />:8 <br />i7 <br />13 <br />,2 <br />'0 <br />,3 <br />\4 <br />:4 <br />G <br />10 <br />,2 <br />:9 <br />'2 <br />,8 <br />:6 <br />G <br />8 <br />16 <br />G <br />G <br />G <br />G <br />G <br /> <br />, \ <br />~ . <br /> <br />A- 7100' <br />1- 1000' <br /> <br />_ MEASURED __ AlC TRACKS <br /> <br />Figure 43c.-Plume Dimensions and Pibal Soundings for 18 <br />February 1965. <br /> <br />rees in <br />~atural <br />Febru- <br />'c. Re- <br />anuary <br />)f arti- <br /> <br />it does not seem likely that the natural freezing <br />nuclei are being scavenged, but are being used. <br />It would be desirable to confirm this by electron <br />microscope technique with replicas taken from the <br />Park Range; facilities for doing this work are avail a.. <br />ble at the National Center for Atmospheric Re. <br />search, Boulder, Colo. <br />Of the snowcrystal replicas taken during the past <br />winter season, 33 were examined in detail. About: <br />50 percent showed collected water drops and/or <br />riming and 50 percent did not. Those showing <br />water drops and/or riming were collected during <br />the early winter (January and early February); <br />those without water drops and/or riming were col.. <br />lected in late February and March. It appears that <br />the presence or absence of water drops characterizes <br />a storm. Figure 48 is an example taken from the <br />28 January 1965 storm. <br />About 40 percent of the replicas contain simple <br />crystals only; the remaining 60 percent consist of <br /> <br />winter <br />indica- <br />lis is a <br />~ncy in <br />Valley <br />during <br />latural <br />rystals, <br />ged by <br />2 indi- <br />'ays by <br />refore, <br /> <br />Ition of <br />Journal <br /> <br />35 <br /> <br />aggregates. The presence of water drops or riming <br />OIl aggregates exceeded that on simple crystals by a <br />2: I ratio, and the dendritic form--which is pre. <br />dominant among all other forms-is most favored <br />for the collection of water drops. <br />If artificial nucleation is effective, the quantity <br />of such drops should decrease when artificial nuclei <br />are provided. The seasonal history of supercooled <br />drop population will show whether the effectiveness <br />of nucleation operations can be expected-on a <br />physical basis-to vary with time, and whether- <br />through neutron activation analyses of replicas-the <br />variation is due to the abundance of natural nuclei <br />or to carry-over effects of AgI nuclei. <br />The measurement of Ag concentration in artifi- <br />cial snow replicas3-snow formed by nucleating <br />supercooled water drops in a cold box-show that <br /> <br />a Schaefer, V. and Fuquay, ].. 1965: "The Detection of <br />Silver Iodide in Snow by Neutron Activation Analysis". <br />Journal of Recherches des Atmospheriques, Vol. II, April- <br />June 1965, No.2. <br /> <br /> <br /> <br />A-IUOO' <br />1-11:10' <br />C-I..OO' <br /> <br /> <br />,/ <br /> <br />~ PRE01CTED <br /> <br />_ MEASUREO <br /> <br />------ TRUCK <br /> <br />Figure 43d.-Plume Dimensions and Pibal Soundings for 22 <br />February 1965. <br /> <br />
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