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<br />. <br /> <br />FOREWARD <br /> <br />. <br /> <br />. <br /> <br />It 1s well recognized that weather phenomena In the :nldlatltude and the <br /> <br />higher often involve ice phase processes. Even In the tropics. the tee phase <br /> <br />processes are not uncommon. To understand and to effect! vely control the <br /> <br />weather, knowledge of the processes Is essential. <br /> <br />The ice phase weather processes begin with the lee nucleation. which Is <br /> <br />followed by the growth and the subsequent processes. Uncertainty of each <br /> <br />process adversely affects the course of understanding or analyzing these <br /> <br />sequential processes of weather. The success of :nodellng effort for describing <br /> <br />weather and climate phenomena critically depends on the accuracy of the <br /> <br />knowledge. <br />To expand our quantitative knowledge of Ice crystal growth processes, we <br /> <br />developed a unique vertically converging, supercooled cloud tunnel and <br /> <br />have measured basic parameters of the processes under the free fall condition <br /> <br />of the crystal for time periods comparable to natural processes. The results <br /> <br />have been reported in a number of international and national Cloud Physics <br /> <br />conferences, but to make effective use of the data, they have to be <br /> <br /> <br />interpreted into empirical equations. The normal approach for the prOblem is <br /> <br /> <br />to find the best fit polynomials. However, considering the shortcoming of <br /> <br /> <br />such a method, 1.e., infleXibility of equations outside the specified <br /> <br /> <br />conditions, a new approach of combining analytic equations covering different <br /> <br />ranges and conditions has been taken. We report the result in the follOwing <br />M.S. thesis. <br /> <br />The outline of this ....ork was presented at the 10th International Cloud <br /> <br /> <br />Physics Conference, Bad Homburg, 15-20 August 1988: <br /> <br /> <br />"Empirical Equations of Ice Crystal Growth Microphysics for Modeling and <br /> <br />Analysis," by C.R. Redder and N. Fukuta. Preprints Vol. I, 12-1~. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />- 1 - <br />