The Geophysical Structure of the Sea 3 1 1 



Replacing Ps, t, o by the relation (IX. 14) gives 



p = D -\- 10-3 f ^^^ dD (IX.16) 



Here only the last term requires numerical integration and has to be summed only to 

 the depth at which the pressure is required. The anomaly in dynamic depth AD for 

 given pressures is also obtained in the same way. Since 



D = Dss. 0. V + ^ A 



AD 



8 dp. (IX. 17) 



If S is known it can also be found by numerical integration. Using the tables given by 

 SvERDRUP (1933Z)) the complete dynamic calculation of the values for an oceanographic 

 station down to 5000 m can with a little practice be done in less than half an hour since 

 the numbers in the tables are always small. 



The absolute values for the specific volume and of the dynamic depth can be ob- 

 tained by adding the anomalies to the standard values for the standard ocean at 0°C 

 and 35%o ; they are given in Table 1 10. If o-^ is known accurately to the second decimal 

 place, then the table will give the density in situ crs,t,D correct to the second decimal 

 place, and the pressure for a given dynamic depth correct to the third decimal place. 

 The specific volume anomaly and that of the dynamic depth at given pressures can 

 be found accurately to the fifth and fourth decimal places, respectively, but the last 

 two places in the anomaly of the dynamic depth have only computational 

 significance. 



Table 111 shows as an example the complete dynamic evaluation for the "Meteor" 

 station 267 (18.11.1927; cf^ = 13-7° N., A = 19-8° W., 4206 m), and also the calculation 

 of the specific volume anomaly and that of the dynamic depth at given pressures in 

 decibars according to the simpUfied method of Sverdrup. 



