PREDICTION OF CO, IN THE ATMOSPHERE 



25 



global average depth into which relatively rapid mixing of C0 2 occurs. The 

 5-year atmospheric residence and 110-m mixed-layer depth represent significant 

 changes from the original model 4 and are due to programming errors. 



The amount of fossil-fuel C0 2 expressed in grams of carbon 5 that have been 

 added to the atmosphere until the last United Nations report in 1968 has been 

 followed by an annual growth rate of 4% per year between 1969 and 1979 and a 

 3 x /}% annual growth rate between 1980 and 1999. When this fossil-fuel CO : is 

 added to the atmosphere via the model, we obtain a prediction of the changes in 

 C0 2 content from 1860 to 2000. This prediction appears in Fig. 4, using the 



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380 



360 



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uj 340 - 

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320 



300 



280 



J I I I L 



1860 1880 1900 1920 1940 1960 1980 2000 



Fig. 4 The predicted rime history of global atmospheric C0 2 from 1860 to 2000. 



