Characteristics of the water-masses of the Philippine, Kcrmadcc and Tonga Trenches 4|V 



to that to be expected from adiabatic heating alone. The salinity and amount ol oxy- 

 gen on the other hand are nearly constant for this same interval (Tables I and II). 



Thus, it appears that any renewal of the deep water masses of the trench must be 

 derived from that of the West Pacific Basin at the sill depth of the trench (i.e. 3-5-4 



0.5" 



1.0" 



20* 



M 



2000 



T — r 



1 — r 



1 — r 



2.5*C 



3000 



4000 



5000 



- / 



6000 



7000 



8000 



9000 



10000 



Fig. 1. Temperatures of the PhiHppine. Tonga and Kemu|dec ^^^^^^^^^ 

 te^peratures^n situ, brokenjne^potent.a. t^^^^^^^^^^^ 



