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<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 /> <br />- 9l - <br /> <br />"diffusion" shows the combined results for 259,-1 and 1001-1 (they did not <br /> <br />differ significantly). These results indicate that increasing the ice <br /> <br />particle concentration should decrease the precipitation rate over the <br /> <br />mountain but increase it downwind. This last conclusion must be treated with <br /> <br />caution if one wishes to equate the "rimed" precipitation with natural <br />precipitation. For ice particle concentrations of the order of It-l or less, <br />the precipitation rate predicted by the model will be linearly proportional to <br />the ice particle concentration for nearly all cases. Thus if we had used an <br />ice particle concentration of O.lR,-l or 101-1, which are within the observed <br /> <br /> <br />variations of natural ice particles, the results would be quite different. <br /> <br /> <br />This indicates the importance of establishing the background concentrations of <br /> <br /> <br />ice particles in clouds under various conditions. <br /> <br />