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<br />'rhe IT is excluded in equation 2 because no measurements or adequate substitutes exist for it. <br />As a consequence, several scenarios can occur. Two possibilities of importance to this study are <br />outlined in the following: <br /> <br />Variable1 <br /> <br />Relative value range <br /> <br />First scenario <br /> <br />PI (= 23) <br />LT (= 2) <br />IT (= 11) <br />PE (= 0.64) <br />PE (= 0.92 withoutIT) <br />PE (= 0.48 if IT= 23) <br /> <br />High <br />Low <br />Moderate to high <br />High <br /> <br />Second scenario <br /> <br />PI (= 2) Low <br />LT (= 23) High <br />IT (= 2) Low <br />PE (= 0.07) Low <br />PE (= 0.08 withoutIT) <br /> <br />1 Values of variables given in parentheses, except for <br />PE, are times 106 g/h per meter crosswind. The pre- <br />cipitation rate for the fIrst scenario's PI corresponds <br />to 7.7 mm/h and similarly, for the second scenario, <br />0.7 mm/h. The precipitation is assumed deposited <br />evenly over a 3-km distance along the wind as <br />described by Super et al. (1987). <br /> <br />Except for the PE, values in both scenarios are given in terms of CLW flux. Excluding IT and <br />PE, estimates are taken from Super et al. (1989). Values selected for IT are considered <br />reasonable in accordance with existing meteorological knowledge (scientific reporting is <br />deficient in measurements of transient ice water). That is, if the precipitation rate is relatively <br />high, a reasonable assumption is that IT is on the order of one-half to perhaps as large as the <br />precipitation. On the other hand, if the precipitation rate is low and LT is high, as in the second <br />scenario, IT likely will be small because ice particles grow at the expense of the CLW through <br />the Bergeron-Findeisen and other processes. Radiometer measurements of CLW during the <br />1987 experiments indicated the inverse relationship often occurring between LT and IT. <br /> <br />The first scenario yields a noticeably larger PE than does the second scenario. This striking <br />difference leads to the rationale for accomplishing task 2. Relationships developed in task 1 <br />would be employed with soundings of the 10-winter data set in estimating the CLW for each <br />day and, ultimately, LT. The precipitation data set for the Mogollon Rim would be used to <br />determine Pl. A value of E would be developed for each sounding period by employing equation <br />(2). Effects on precipitation, of different cloud seeding scenarios, could then be tested by altering <br />the values of LT. <br /> <br />18 <br />