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<br />The primary goal of these tracer experiments would be <br />to document transport and diffusion characteristics under <br />a variety of synoptic weather situations. Such information <br />could then be utilized to simulate ground or airborne releases <br />of silver iodide nuclei. Ratios of released to observed values <br />of SF6 and corresponding values of silver iodide could quantify <br />the amount of silver iodide that would be present at various <br />points in the SF6 plume. <br /> <br />Ground releases of sulfur hexafluoride (SF6) gas were <br />conducted at five different ground sites during the operational <br />period from January 21 to March 17, 1987. Release rates were <br />measured with a mass flow meter and redundancy was provided <br />by weighing the SF6 cylinders before and after release. Weather <br />briefings were generally conducted in the morning hours with <br />special consideration given to the possibility of favorable <br />conditions for a ground release of SF6. If weather conditions <br />did look promising then a release site was chosen such that <br />transport of the plume would be over the Mogollon Rim and <br />preferably in the direction of Happy Jack. <br /> <br />These conditions were satisfied on eight different dates. <br />The ground release crew was dispatched early to allow for <br />the tracer gas to be released and reach altitudes at which <br />it could be intersected by the research aircraft. Detailed <br />summaries of each of these flights are covered in Section 4.5.2 <br /> <br />First passes by the aircraft were usually made close <br />to the release site and at a relatively low altitude. If <br />the SF6 plume was intersected then generally the plane would <br />ascend in 76 or 152 m (250 or 500 foot) increments in order <br /> <br />2Unless otherwise noted, all times referenced in Section 4.0 <br />are MST. <br /> <br />4-2 <br /> <br /> <br />(I <br />I <br />t <br />I <br />, <br />I <br />t <br />t <br />,I <br />, <br />. <br />,I <br />I <br />I <br />,I <br />" <br />t <br />J <br />'I <br /> <br />