g 

 Table 1-2. A Balanced Budget of Annual Net Fluxes (x 10 



tons C yr" 1 ) of the Global C0 2 Cycle (after 



Walsh et al., 1981). 



Sources Fossil fuel emission 5.20 



Equatorial outgassing 1.00 



Volcanism 0.05 



Deforestation 1.00 



Total +7.25 



Abiotic Sinks Atmospheric storage 2.60 



Reverine release of DOC 0.80 



Estuarine sediment 0.20 



Deep water formation 2.00 



Total -4.60 



Biotic Sinks Open ocean fecal pellets 0.10 



Slope storage of phyto-detritus 1.55 



Total -1.65 



1-4 



