本邦における降水量の統計気候学的研究

Numerous studies of rainfall have hitherto been carried out mainly from a synoptic meteorological stand-point, while diverse trials to describe climatic rainfall situations were attempted by E. Fuxin and others in Japan.<BR>In this paper, the various results of statistical and climatolo g ical analysis applied to rainfall data are coordinated by synthesizing and partially correcting the author's separate contributions to statistical study concerning the varieties of precipitation in Japan.<BR>Firstly, a certain unified functional expr e ssion of frequency distributions obtained on the basis of the actual rainfall and rain-duration data was schematically contrived to have fairly rational fitness for the arbitrary time scale of rainfall observation, and moreover the several geographical distributions of estimated parameters contained in such a unified functional distribution were explained rather in detail from a climatological viewpoint.<BR>Secondly, cross and auto-correlation analysis and regression analysis were elaborately performed to investigate the localities and time dependent relations appearing in the short-range amounts of rainfall on the basis of a temporary observation network designed so as to serve special users. Several peculiar features of rainfall were made clear in the typical functional expressions in Japan.<BR>Lastly, a new regional c lassification of Japan was systematically tried by synthetic comparisons and considerations of computed statistical quantities by use of annual and monthly rainfall data through significance tests applied to actual statistical results. The final classification arrived at is slightly different from the traditional climatic classification obtained by the several representative climatologists.