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<br />SILVER IODIDE CUMULUS SEEDING
<br />
<br />OBJECTIVES:
<br />
<br />METHOD:
<br />
<br />1, A concentrated charge of silver iodide (Agl)
<br />is delivered directly to cloud where it converts
<br />supercooled drops into ice.
<br />
<br />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 />1":"1
<br />/'" )
<br />(,',/:, )
<br />r :'"i\~#
<br />
<br />AgI
<br />
<br />2, This rapid freezing releases heat which
<br />increases the cloud chimney temperature
<br />by (2_40F) thus producing a strong pulse of
<br />c:r~ energy which causes substantial cloud growth.
<br />;.\'.r;;;
<br />
<br />(+2-40FI) 3. This cloud growth in turn processes more water
<br />1.1\1
<br />~.~ and develops more efficient precipitation.
<br />
<br />(~~'
<br />( .',1:>::',1 1 4,
<br />Il'd' 1 "\
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<br />,pYp
<br />
<br />The amount of growth is dependant upon the
<br />amount of Agl released into the cloud and the
<br />efficiency of Agl particles as well as the
<br />structure of the natural environment.
<br />
<br />LIFE CYCLE OF CLOUD DEVELOPMENT
<br />
<br />NATU RAL CLOUD
<br />
<br />IOOF-
<br />
<br />"~; ~ /',~190
<br />.t.,"f.~ r~'~:'...'
<br />r-;.~- - - - ~l;:~:~;~- - -tj{;Fr-, - - - ~"\-1l-
<br />! ~">(,:J~,;'oo':) :';'l;:(~ I'J".f:(
<br />\ ," :. o~. " '.. 0:,/;. .;~:.""" ~'.~ :.:, ~.:.' '.\.:~.. ..' ,{,r,
<br />(~ - ~~ '(~~;;l;'" .,~ <~;,',: .-,
<br />----~---- ." ., -~-- ------........
<br />
<br />320F - -
<br />
<br />(0) 0
<br />
<br />--=---- .~
<br />
<br />Time:
<br />
<br />5 min,
<br />
<br />IOmin,
<br />
<br />15 min,
<br />
<br />(1) 25min,
<br />
<br />Ice crystals grow lorger at
<br />expense of cloud droplets,
<br />toll thru c1oud,and melt
<br />into large drops.
<br />121
<br />Lorge drops coalesce with
<br />other droplets and grow
<br />into raindrops which fall
<br />to ground,
<br />
<br />35 min,
<br />
<br />Cumulus storts
<br />building,
<br />
<br />Few lorge drops torm,
<br />Cloud grows,
<br />
<br />Mo", lorge drops <Jld
<br />few Ice crystals form.
<br />Cloud reaches maxi~
<br />mum heigH,
<br />
<br />Light rain continues
<br />os cloud dissipates,
<br />
<br />LEGEND
<br />.. -Ice
<br />~iD_Liquid droplets
<br />
<br />MODIFIED CLOUD ~~~.. 41,::'
<br />IOOF ~JECTIVE IL - - - - - ~.r2;'1! - - ;":V~":';
<br />320F - - - - - -Tlr- - - - /!l0-- -il~\~':'\ ) - -(I''til:1'
<br />('/;:';{.' jJ:;:: 1'1 Ill') I _/11:
<br />/:=\ ./:::.,' ',". ~\\,'\. ,I \ \~ (II:~ _ '.
<br />(b) L/-.';:=,. ~ '" >Ti' ~\" .... ,~~
<br />~.~~ -, ~\----- -~'~
<br />~oncentratedchOrgeofs.i1ver Great amount of heat is rt- Much more water
<br />Iodide (1611 dehvered mto leased when super~oo'ed is processed by IGrqer"
<br />updraft of cloud drops freeze, causing sub- cloud, resulting inmore
<br />stontiolcloudgro'llth. precipitotiononthe
<br />ground.
<br />
<br />
<br />,..
<br />
<br />--------=--
<br />
<br />MODIFIED CLOUD
<br />
<br />IOOF- (OBJEC!IVE2-Whenconditions not favorable - -~-'~ - - - -- - -
<br />for stImulated claud growth and ~ f'. *....;.
<br />~'". ",""' -."., .,:" ri' ". IT1
<br />
<br />
<br />
<br />~1~~~~-~~)~'iJf'. -
<br />
<br />
<br />
<br />
<br />Time: 5min, IOmin, 15min~~- 25min, 35min,
<br />
<br />Silver iodide III Many ice Cr1Stol'.i form in super- Moderate rain
<br />delivered into cooledregionofcloudondgro'll continues os
<br />updraft. at expenSe of cloud droplets. cloud dissipates.
<br />IZlPrecipitotion begins .hen lof'ge
<br />ice crystals foil ond melt.
<br />
<br />LEGE~O
<br />Jfi -Ice
<br />
<br />;,r -Liquid droplets
<br />. '-AQI nuclei
<br />
<br />23
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