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<br />II <br />I <br />~ :1 <br /> <br />accretion, aggregation). The most important acti- <br /> <br />vity of the 1985-86 field program will be to reduce <br /> <br />this uncertainty. The basic approach will be to <br /> <br />release seeding material into relatively simple <br /> <br />clouds over the Grand Mesa, and to attempt to <br /> <br />direct 1 y det,ect the mi c rophys i ca 1 changes caused by <br /> <br />the seeding including modifications in ice particle <br /> <br />concentration, size spectra and habit, and in SLW <br /> <br />content. Two modes of seeding will be utilized. <br /> <br />These are: <br /> <br />a) Ground r(~leased AgI from a generator(s) upwind <br />of the gE~neral vicinity of the GMO. Ai reraft <br /> <br />passes will then be made across the wind in a <br /> <br />manner similar to the T & 0 investigations, but <br /> <br />no lower than 12,300 feet (375m) which is 1000 <br />feet (305m) above the highest point on the <br /> <br />Mesa. This is because lower flight is not <br /> <br />practical under the IFR conditions that will be <br />sampled. <br /> <br />The ground PMS (Particle Measuring Systemls) <br /> <br />2D-C probe and snow particle camera near Island <br /> <br />Lake, and the network of high resolution preci- <br /> <br />pitation gauges (see Figure 2), will also moni- <br /> <br />tor changes in ice crystal characteristics and <br /> <br />precipitation rate, respectively. <br /> <br />8 <br />