VERTICAL AND HORIZONTAL MOVEMENTS IN THE OCEAN 605 



34-9 



3^-0 



3^2-21 -3 



3H 



3^1 



SALINITY MI/L 



Fig. 2. A plot of salinity against potential temperature below 8°C at station 

 Cavall (46° 30'N, 8°00'W) together with curves of equal potential density. March 

 and September, 1958, combined but April omitted. The linear curves have been 

 derived from the data by the method of least squares. The dotted lines between 

 1600 m and the bottom were drawn from the first breakdown of the T-S observa- 

 tions. The full lines below 1850 m were constructed subsequently in the light of the 

 information gi\'en by the oxygen analyses and provide a better fit. The dashed 

 lines between 1600 and 1850 m reconstructed similarly have a probability little 

 greater than the original dotted line. 



a steplike structure for the T-S observations between 1850 and 

 2600 m. In Fig. 2 the first approximation has been drawn as a 

 dotted Hne and the later refinement in full line. We see that on 

 this interpretation the observations are best fitted by a number 

 of water masses each in neutral adiabatic equilibrium. Two further 



