778 EIGHTH PACIFIC SCIENCE CONGRESS 



From the figure (500-meter layer), we can recognise a remarkable 

 poor oxygen region on the east side of the North Pacific Ocean. Espe- 

 cially off California, we can find even no oxygen at that layer; how- 

 ever, on the west side— Kuroshio region— the content being abundant 

 comparatively. And in the Oyashio region the minimum layer is at 

 shallower depth. This means that in the southern region off Kurile 

 Islands there occurred upwelling of the intermediate water of the North 

 Pacific Ocean. 



The writer will, in conclusion, show the general circulation of the 

 intermediate w^ater of the North Pacific Ocean as follows: 



(1) In the region off California the intermediate water upwells and 

 runs westward following the equatorial current. 



(2) Before reaching the Kuroshio region it mixes with other waters 

 along the route. 



(3) A part of the above mentioned current takes the easterly course 

 sinking to a lower layer. 



(4) The other part of the current flows northward to the Kurile 

 Islands region and runs eastward along Aleutian Islands to places off 

 North America and California. 



