On the Effect of Topography on the Precipitation in Japan. 



13 



8. In comparing the jx'arly barometric gradient with the 

 difference of j^early precipitation on both sides of the land, several 

 procedures were tried among which the following seems to be most 

 convenient for demonstrating the topographical influence. 



To take, for example, the case of the Northern Japan I-II, a 

 vector diagram (Fig. 2) of the yearly barometric gradient was 

 plotted on a sheet of coordinate paper, the end point of the vector 

 for each year being marked and numbered according to the number 

 of the year. On the other hand the difference of the values: 

 Yearly anomaly of the percentage value of precipitation 

 Mean anomal v ,, „ „ „ 



10' -05 Oi 10 -IS 10 



10 -OS OS 10 15 20 2S 30 jy 



Fig. 2. 



