318 THE DEEP SEA 



data. The only reliable estimates of the pre-bomb concentration 

 of tritium in the oceans are those for the North Atlantic surface 

 water based on measurements by Begemann at the University of 

 Chicago and by Giletti at the Lamont Geological Observatory, 

 both investigators finding a pre-bomb level of 1 tritium per 10^^ 

 hydrogen atoms. With the above model and the mixing rates 

 obtained from C^^ data, the tritium concentrations of each of the 

 other ocean reservoirs as well as the required input rate are 

 uniquely determined. It is interesting to compare the production 

 rate of tritium computed in this manner with those made by 

 entirely independent means by other investigators. The value of 

 two T atoms/cm- sec is satisfactory agreement with independent 

 estimates of one T atom/cm- sec. 



A second internal check is to determine whether the industrial 

 COo added to the atmosphere over the past 100 years will be 

 transferred into the ocean at a sufficient rate to satisfy the C^^ 

 data on tree rings obtained by Suess, Fergusson, and others. The 

 results are shown in Fig. 9. The curve based on the model must 



/ 



/ 



POTENTIAL BOMB C "^ CHECK ' 



/ 



SOUTHERN 



HEMISPHERE 



ATMOSPHERE 



1850 1900 1950 1952 1954 1956 1958 I960 1962 1964 



DATE 



Fig. 9. Comparison of observed and predicted industrial CO2 effect on atmos- 

 pheric C^yC^- ratio. 



