308 THE DEEP SEA 



Table IV. Industrial CO2 Effect Correction 



AC" aC'^ 



Location 1955 1890 



North Atlantic (60-80° X) (3) 

 North Atlantic (15-40° N) (18) 

 Caribbean (8) 



South Atlantic (0-42° S) (16) 

 Antarctic (<3° C) (3) 

 South Pacific (15-42° S) (16) 

 Atmosphere 

 Average ocean 



Note. Quantities in parentheses indicate number of samples. 



For the deep water, the sample locations in the Western Basin 

 and Eastern Basin of the Atlantic are shown on the vertical profile 

 in Fig. 3. The depth and latitude coverage are fairly complete 

 between 40° N and 40° S. The areal distribution of the sampling is 

 shown in Fig. 4. All main water masses have been sampled. 



Again since consideration of individual results is impractical in 

 the time available, averages are shown in Fig. 5. One broad feature 

 is that water originating at the Antarctic surface in all cases has a 

 lower AC^^ value than that originating in the northern North 

 Atlantic. This pattern is consistent with that observed in the 

 surface waters, the concentration being lower in the Antarctic 

 than in the northern-most Atlantic. Except for a layer of high 

 C'' water between 1200 and 2500 m in the Western Basin, the deep 

 waters of the North Atlantic and those which penetrate the South 

 Atlantic from the North are nearly uniform in C^^ concentration, 

 100 per mil of 10% below the atmospheric value. Bottom samples 

 do not differ significantly from those taken in the core of the mass, 

 and there is no significant change with latitude. As shown in 

 Table V, there appears to be a lower C^^ concentration in the 

 deepest water of the Eastern Basin than in the Western Basin 

 suggesting a longer residence time in the Eastern than in the 

 Western Deeps. Above the ridge the two basins apparently mix 

 quite rapidly. 



