24 



MACHTA 



Fig. 2 The model of the three reservoirs of C0 2 . The quantity \ denotes the fraction 

 of the CO-, in one reservoir being transferred to an adjacent reservoir according to 

 the sense of the arrow. 



600 



500 

 oo 



° 400 

 < 



300 



to 



CN 



o 



200 



100 



- Entire atmosphere 



1955 



1957 



1959 



1961 



1963 



1965 



1967 



1969 



Fig. 3 The time history of 14 C atoms produced by nuclear tests in the troposphere 

 and in the whole atmosphere (up to 30 km). (Source of data, Telegadas. 1 ' ) 



