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<br />tial snow sampling will include classification by principal ice crystal <br />habit present, and by degree of riming. <br /> <br />b. Sequential sampling methods will be used to collect the snow samples <br />from the Kingvale and the Tahoe-Donner sites. Portable snow collectors are <br />ready for use. Samples can be collected with a variable time resolution. <br />Minimum time resolution will be 10 minutes per sample but wi 11 depend on <br />precipitation rates. <br /> <br />c. Approximately 50 percent of each sample will be used for chemical ana- <br />lysis for silver and/or indium. The other 50 percent of the samples will <br />be used for measurement of stable isotope composition (018/016). The <br />018/016 samples will provide information on the temperature at which the <br />bulk of the water in the crystals froze. <br /> <br />d. DR! will process rime-rod observations taken on the cloud physics <br />aircraft using the 018/016 isotope method and will process micropore <br />filters for the presence of silver and indium. <br /> <br />e. A core sampling program will also be conducted by DR! in support of the <br />ground seeding program. This to determine the spatial and temporal distri- <br />butions of the seeding chemicals in the snowpack. <br /> <br />The sampling sites chosen are all downwind of the seeding aerosol release <br />points for the normal south and southwesterly to northwesterly flows which <br />bring the majority of precipitation to the region. <br /> <br />The snowpack wi 11 be sampled after every storm producing significant amounts <br />of precipitation (minimum depth> 15 mm) up to one meter. The sampling of the <br />snowfall will be carried out at the sites using vertical profiling techniques. <br /> <br />I II -24 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />