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<br />. <br /> <br />. <br /> <br />CHAPTER 2 <br /> <br />. <br /> <br />EMPIRICAL BACKGROUND <br /> <br />. <br /> <br />The empirical basis of this investigation consists of six data sets provided <br /> <br /> <br />by Fukuta (1969), Ryan, Wishart and Shaw (1976), Fukuta, Neubauer and <br /> <br /> <br />Erickson (1979), Kowa (1981), Gong and Fukuta (1985) and Takahashi and <br /> <br /> <br />Fukuta (to be published). These data sets fulfill the criterion that the <br /> <br /> <br />corresponding experiments adequately simulate ice crystal growth processes <br /> <br /> <br />in the natural cloud environment under the controlled conditions. Indeed, <br /> <br /> <br />each of these experimental studies succeeded in growing crystals for time <br /> <br /> <br />periods ranging from 1 to 30 minutes either in cloud chambers or supercooled <br /> <br /> <br />cloud tunnels. Furthermore, each investigation satisfactorily maintained <br /> <br /> <br />controlled homogeneous cloud conditions under constant temperature and <br /> <br /> <br />liquid water content. Thus, these accomplishments make the resultant data <br /> <br /> <br />useful in verification of theory and the development of empirical <br /> <br /> <br />expressions. <br /> <br /> <br />However, since the present study depends heavily on the accuracy and <br /> <br /> <br />reliability of experimental data, they have to be examined carefully. In order <br /> <br /> <br />to carry out this task, the experimental techniques will be analyzed to <br /> <br /> <br />determine the quality of simulation and control of the cloud environment. <br /> <br /> <br />Also, methods for measuring quantities such as ice crystal mass and fall <br /> <br /> <br />velocity will be checked for accuracy. If some of the data have inconsistencies, <br /> <br /> <br />the possible corrective factors will be considered. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br />