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Dissolved Inorganic Carbon

DIC Budget Table
DIC Budget

1 from Canfield and Des Marais 1993
2 from van Gemerden 1993
3 These equations have, for simplicity, been based on the assumption that 25% of the H2S is used for CO2 fixation and 75% for energy generation by respiration; however, the proportion of H2S used for CO2 fixation may vary from 10% (most Thiobacilli) to 33% (Thiocapsa) which gives rise to some variability in the CO2 to H2S consumption ratios.
4 Moezelaar et al. 1996 (from degredation of glycogen and glycosyl-glycerol, also produced are actetate and smaller amounts of ethanol and formate)
* these two ratios are combined in model

Stoichiometric ratios that affect the DIC budget in MBGC and their associated equations. The bacteria associated with these processes are: Cyanobateria (CYA), purple sulfur bacteria (PSB), colorless sulfur bacteria (CSB), and sulfate-reducing bacteria (SRB).

Comparison of MBGC vs Field DIC flux across the mat-water interface.
DIC flux across the mat boundary in mmol m-2 hr-1. The figure compares field data (averaged each time period) with MBGC results with various levels of sulfide created per CO2 released (see DIC budget). Positive values are DIC effluxes out of the mat (and into the water column) and negative values represent DIC influxes into the mat (from the water column).
 

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