PACIFIC OCEAN 



\^r--^. (7,= 2S.40 JAN.- FEB.- MAR. 



SALINITY %. 



\'-^\\^\\ 



mtntstt di 



100* IKS' 120' ll6° 140^ 1^' iGty " 170° 180° 170° 160° 150° 



0° 130' 150° 110° iO(y 90° 80° 70° 



FIGURE 25. Chart from the oceanographic atla!^ of the 

 Pacific Ocean, showing a »ignia-t (density) surface that 

 extends from iho surface (northern and southern extremes) 

 to a depth of about 1.000 feel off Japan. The period is 

 Jaiiuar> through March. The values marked by numbers 



are those for salinity, which is given in parts per thousand. 

 The effect of th*- large rivers of the Pacific Northwest is verv 

 clear from the salinity distributions. The discharge of fresh 

 water into the sea is evident for hundreds of miles offshore. 



37 



