GEOCHEMISTRY AND PHYSICS OF OCEAX CIRCULATION 311 



Table \\ North Atlantic Deep Water Western versus Eastern Basin 



Depth, meters 



W'estern Basin Eastern Basin 



2500-4000 

 >4000 



-103 (7) 

 -100 (15) 



107 (7) 

 127 (3) 



Note. Quantities in parentheses indicate number of samples. 



The evidence for a C^^ maximum layer between 1200 and 2500 m 

 is summarized in Fig. 6. Samples taken in the Western Basin of 

 the North Atlantic have 20 to 40 per mil more C^^ than those 

 above and below as well as those to the south and east at the same 

 depth. Samples from the southern South Atlantic at this level 

 show even lower values. From their lower salinities it is probable 

 that these samples are of Antarctic rather than North Atlantic 

 origin. 



-I2I{2) 



60°S 



LATITUDE 

 IDEALIZED VERTICAL PROFILE - WESTERN BASIN 



Fig. 5. aC^^ averages for various water masses. Numbers in parentheses 

 indicate number of samples. 



