ATMOSPHERIC CARBON DIOXIDE AND RADIOCARBON: I 



73 



< 



10" 



10 



-3 



0.1 



ears 



TTT 



i 



85 years 



"",','■'■'■'.'.' 



11.1 years 



I I l l I III L 



STANDARD 



10 



RELATIVE SIZE OF SURFACE LAYER (N 'N J 



(TIL) dU 



Fig. 17 Attenuation of 11- and 85-year bands, and a 400-year cycle, vs. the 

 relative size of the ocean surface layer expressed in terms of the ocean surface 

 layer to atmospheric carbon ratio, N mo /N ao . The size of N mo used as a 

 standard value (2N ao ) is indicated by an arrow. 



100 



10 



-1 



< 



z 



w 10" 



I- 

 < 



10" 



■*T*«— *— TT** 



w»"!w»»w"w Wf^mrmmf 



400 years 



•\ -=■ 



85 years 



7 a * MABaMMMM 



11.1 years 



J ~- 



1 2 | 3 



STANDARD 

 RELATIVE SIZE OF LAND BIOTA 



bo eo ao 



Fig. 18 Attenuation of 11- and 85-year bands, and a 400-year cycle, vs. the 

 relative size of the land biota. The size used as the standard case 

 (Nfj + N eo = 2.656 N ao ) is indicated by an arrow. 



