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<br />2
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<br />parameters of temperature, water vapor conoentration, and liquid water
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<br />content as they interaot with the aerosol partiole prior to ioe
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<br />nuoleation.
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<br />The methodology of ohemioal kinetios has been reoently applied to
<br />
<br />the study of ioe nuoleation by silver iodide aerosol partioles as the
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<br />prooess ooours in an isothermal oloud environment (DeMott, 1982, and
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<br />DeMott, et al., 1983). Chemioal kinetio methodology oan be used to
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<br />define the physioal meohanism of ioe nuoleation by interpreting the
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<br />observed changes in rates and yields as funotions of oloud parameters
<br />
<br />and aerosol composition.
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<br />The temporal behavior of the prooesses
<br />'"""""'""V~.=,"",,,,,,,,=,,=;",:,,,,,,,,~,,~<,,,,;"""- -, . -- - . ~ ""-""';';7""~
<br />
<br />observed is the integral element~~e..!~!..J~~llet1o ~~~S1..Y. This methodology
<br />~ ..__c....._......_ ."......".=..~..'''T..,.,'''''..-n.'~_"''"'''_
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<br />differs from past studies where the temporal oharaoteristios of the ioe
<br />
<br />nuoleation prooess was not inoorporated. Past studies have concentrated
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<br />mostly on variations in effeotivity (yield), partioularly in the oase of
<br />
<br />silver iOdide-sodium iodide ioe nuclei. Temporal rates of ice
<br />
<br />nuoleation by silver iodide-sodium iodide aerosol partioles have not
<br />
<br />been olearly determined. The effeot of supersaturation with respeot to
<br />
<br />liquid water on ice nuoleation by these aerosol partioles has not been
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<br />fully explored. When enoountered in experiments, the effects of
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<br />supersaturations were noted. Attempts were usually made to eliminate
<br />
<br />the supersaturation rather than try to understand its effeots.
<br />
<br />1.2 Ob1ectives
<br />
<br />The primary goal of this study is to charaoterize the ioe
<br />.:.....~'""""-;~~___,_~__~____'''.,_..,,'.J"'-_...-...... ._._.....,,,,,,,,........_-.,, .
<br />
<br />nu cle~ti.!'l~"_pr~!~.!!!.,.pJ'. si~!!.~". *2.9'!~~!:lSOdi~, ..~~~!,4~ aerR!R~."Par~i ~~~~~;
<br />.....,..-~. ...=-~
<br />
<br />produced by oombustion of an acetone solution, using the meth9dology of
<br />......,<<";...=.._,,__~,.<...,._,.'."'","._" '-"'''''.''~-~'''i"-"""",'''_''_''''''''''''''-''''''''-'''''''-''''''''''-''' r"'- "--.' ,." ,..."._~- .- ",....,..,"'"-_;"'7....,.."..~"-,N'-"..-.,-...,, , .., "'''':,'''-';;'- .';."r"""'~""--' C'-'n '._ ,_ .'. ", ,-----.- .__~..-_,,--.w.-.c
<br />
<br />ohemioa+ kinetios.
<br />
<br />The mechanism, temporal"z:;!~!., andey,1elct,,,,,
<br />
<br />1r;;;...........-.....-'"<..~.-=""',:;""-,..,.,.,("""'...,....;;,.~.".,......,~1I?tJ"fl~
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