ATMOSPHERIC CARBON DIOXIDE AND RADIOCARBON: II 125 



Long-lived land biota 



(ft + * X ) *" b = * Alb (C15) 



Short lived land biota 



(j + *x]*n e = *A, e (C.16) 



Lower atmosphere 



feH 



where 



f 'n, = -*A lu - *A lb - *A le + *A m , (C.17) 



Ocean surface layer 



(^ + *x) *n m = -*A ml - *A md (C.18) 



Deep sea 



(f t + *x) *n d = *A md (C.19) 



*A lu = -*/ s *n u + */ 6 *n, (C.20) 



*A, b = -*/,*n b + */ 2 *n, +/ln b -/^n, (C.21) 



*A, e = -*/ 3 *n e + */ 4 *ni +/;n b -/; ni (C.22) 



*A ml = -*k 3 *n, + *k 4 *n m +kln m (C.23) 



*A md = -*k 6 *n d + *k s *n m -k 2 n m (C.24) 



The k's and *k's refer to transfers between reservoirs connected in tandem, 

 and the /'s and */'s refer to transfers in a branched configuration with the 

 atmosphere (see Fig. 1). The coefficients kj , k 2 , l\ , . . . U refer to factors that 

 multiply some of the inactive nj to produce virtual radiocarbon sources of the 

 form 2 k 'nj. These sources lead to readjustments of ' 4 C which arise because of 

 changes in the inactive-tarbon content of the reservoirs. The coefficients kj and 



