rises a little to above 18 C. Water temperature is approximately the same from the surface 

 through the 100-meter level, showing that mixing is being carried on by convection currents. 



Table 70. --Oceanographic conditions southeast of Cape 

 Nojima 



Note: (1) The distances are shown from Cape Nojima as a starting point. 



(2) This table is drawn from the Records of Oceanographic Investigations for 1937. 



o 



In May the zone with the highest water temperature is 50 miles off shore, where 20, 7 



C. is shown. From here on out to the 200-mile line temperatures gradually fall to between 18 



o o 



and 19 C. In the vicinity of the 300-mile station they rise somewhat to 19. 7 C. If one looks 



at the vertical distribution of the water temperatures, the tendency toward stratification is clear. 



In August the coastal waters are up to 23 to 24 C. , and the area of highest water 

 temperatures is about 40 miles off shore, where the surface water temperature is 28. 6 C. From 

 70 miles off shore on out the water temperatures are from 27 to 28 C. , and the temperatures 

 are at their lowest in the vicinity of 250 to 300 miles off shore. 



In November the zone of highest water temperatures appears between 20 and 40 miles 

 off shore with surface water temperatures of 24. 6 C. From 80 to 180 miles off the coa^t the 

 water temperatures are between 22 and 23 C, and from 200 miles off the coast on out the tem- 

 peratures are from 23 to 24 C. 



In the off-shore water the transparencies are highest in the summer, when the 

 waters are stratified, with values of 25 to 28 meters. In winter, which is the season of convec- 

 tion, values are low, being about 17 to 20 meters. As for water color, II on Forel's scales 

 generally most frequent, with III observed quite often. 



103 



