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<br />, <br /> <br />SlliVER IODIDE CUMULUS SEEDING <br /> <br />OBJECTIVES: 1. Aid natural cloud development by increasing cloud <br />buoyancy thru addition of heat. <br />2. Increase the number of ice crystals in the cloud so <br />they can grow at the expense of the supercooled <br />cloud droplets and fall out of the cloud as rain. <br /> <br />METHOD: <br /> <br />1. A concentrated charge of silver iodide (Agl) <br /> <br />is delivered directly to cloud where it converts <br /> <br />I: '\ supercooled drops into ice. <br />/'f<" ) <br />( . ....') <br />(;H'J ~:: ) <br />( :,.\\~\~:.~ 2. This rapid freezing releases heat which <br /> <br />"~~~ increases the cloud chimney temperature <br />AgL <br />, by (2-40F) thus producing a strong pulse of <br /> <br />, <br />-------- <br />c:r;.fJ~ ~~ <br />2 ~ 0 ~ <br />'ill Q if <br />+2-40F~) <br /> <br />f 01 D\ 01 <br /> <br />~o 0"""" <br /> <br />,,-- ~,"T ;." "'\ <br />(. ", * '\ <br />( .. IH( i ~ 4. <br />('o-lI~I'(\,,~ 'o~ <br />0;'-1\1- \~.. """""" <br /> <br />\. . 0 0 : \ .0, 0"'--"" <br />o <br />o 0 0 <br />~ 0 <br />D C 0 <br /> <br />energy which causes substantial cloud growth. <br /> <br />3. This cloud growth in turn processes more water <br /> <br />and develops more efficient precipitation. <br /> <br />The amount of growth is dependant upon the <br /> <br />amount of Agl released into the cloud and the <br /> <br />efficiency of Agl particles as well as the' <br /> <br />structure of the natural environment. <br />