.TOUl'.NAT. OF THE COLLEGE OF SCIEKCE, TOKYO IMPERIAL UNIVERSITY. 



VOL. XLI., ART. 5. 



On the Effect of Topography on the Precipitation 



in Japan. 



(Coutributiou III. from the Geopbysical Seminary iu the Physical 

 Institute, College of Science). 



By 



Torahiko TERADA, RifjakuliakusM. 

 Misio ISIMOTO, Bigakiishi and Masuziro IMAMURA, Rigakiishi. 



1. As to the general distribution of precipitation in Japan, 

 there is an earl}^ investigation of Prof. Kiyoo Nakamura^^ He 

 pointed out a marked difference of the annual course of the 

 precipitation on the Pacific and Japan Sea ^ides. According to 

 his results, Japan Sea side has abundunt precipitation in autumn 

 and winter compared with spring and summer; the maximum 

 falls in December and the minimum in May; but the seasonal 

 fluctuation is generally small on this side. On the contrary, the 

 Pacific side is characterized by abundunt precipitation in summer 

 and autumn and also by a large fluctuation. He divided the 

 Pacific side into five districts and described the peculiarities of 

 each district in some details. Besides, he alluded to the remark- 

 able effect of topography in some examples. 



Recently, a Decennial Report of Precipitation,^^ 1901-1910, 

 was published by the Central Meteorological Observatory, in 

 which monthly records of observations in 1570 stations are given. 

 In a note appended to the Report, Prof. Fujiwhara gave a brief 

 account of the general distribution of precipitation in entire Japan, 

 and confirmed in the main the results obtained by Prof. Nakamura. 

 He also discussed the dependency of precipitation on the latitude 



1) K. Nakamura, Dai-Nippon Hûdohen :^0^®L±^ (Climatology of Japan), 1897, 

 Chapter VI. 



2) Uryô-Zyîmenhô MÄ+¥^ 1914- 



