?IC 



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» ( M ) 



Figure 3a, --Water temperatures between 

 Cape Nojima and Iwojima. 



is thought to correspond to 

 the main flow area of the 

 Kuroshio. Farther to the 

 south the water temperatures 

 below 200 m. drop sharply, 

 and the 20 C. isotherm runs 

 at approximately 150 nm. South 

 of 28 N. the surface water tem- 

 perature rises markedly, and 

 from about 25 30'N. southward 

 the temperatures are above 

 25 C. Off the coast near Cape 

 Nojima the isotherms and 

 isochlors are almost vertical, 

 fronn which it canbe seen that 

 the oceanographic conditions 

 change abruptly there. 



(TM) 



25 CN) 



Figure 3b. --Chlorinities between Cape 

 Nojima and Iwojima. 



Figure 4a andb shows 

 the distribution of water tem- 

 peratures based on datafrom 

 sectional observations extend- 

 ing 200 miles due east of Cape 

 Inubo. Figure 4arepresents data 

 from the 8th and 9th of December. 

 At about 40 miles from the 

 coast temperatures of 20 C. 

 reached deeper than 300 m. , 

 and this is thought to be the 

 main stream of the Kuroshio. 

 In b, which is for the 29th 

 and 30th of December of the 

 same year, the mass of 20 C. 

 water has already disappeared. 

 The 19 C. isotherm reaches 

 or nearly reaches the 300-nn. 



level at 70 and 90 miles from the coast, so it appears that in this vicinity 

 the main flow of the Kuroshio is divided into two branches. Although fig- 

 ures a eind b represent data collected only 20 days apart, there are major 

 changes in the pattern of the currents, and the main flow of the Kuroshio 

 has moved about 50 miles farther offshore at the end of the month as com- 

 pared with its position in the early part of the month. 



Infigure4b the isotherms are almost vertical, and from this it can 

 beseenthat the chajiges in oceanographic conditions in this area are locally 



abrupt. 



39 



