Table 2.
Rates of subseafloor activities and biogeochemical fluxes (in electron equivalents) per unit area and per cell
| Site | Subseafloor O2 reduction rate (mol e-/cm2/yr) | Subseafloor NO3− reduction rate (mol e-/cm2/yr) | O2 reduction rate based on net NO3− production (mol e-/cell/yr) | Organic carbon burial rate at 1.5 mbsf (mol e-/cm2/yr) | Radiolytic H2 production rate (mol e-/cm2/yr) | Total cells below 1.5 mbsf | O2 reduction rate per cell(mol e-/cell/yr) | O2 reduction rate per cell based on net NO3− production (mol e-/cell/yr) | Organic carbon burial rate per cell (mol e-/cell/yr) | Radiolytic H2 production rate per cell (mol e-/cell/yr) |
|---|---|---|---|---|---|---|---|---|---|---|
| SPG-1 | 7.9E−08 | n/a | 7.1E−09 | 8.2E−09 | 2.7E−08 | 8.9E+07 | 8.9E−16 | 8.0E−17 | 9.3E−17 | 3.1E−16 |
| SPG-2 | 2.7E−08 | n/a | 3.6E−09 | 4.3E−09 | 6.2E−09 | 2.6E+06 | 1.0E−14 | 1.4E−15 | 1.7E−15 | 2.4E−15 |
| SPG-3 | 1.6E−08 | n/a | 5.6E−09 | 2.2E−09 | 1.6E−09 | 1.7E+06 | 9.6E−15 | 3.2E−15 | 1.3E−15 | 9.3E−16 |
| SPG-4 | 2.2E−08 | n/a | n.d. | 7.8E−09 | 3.2E−09 | 4.7E+06 | 4.7E−15 | n.d. | 1.7E−15 | 6.9E−16 |
| SPG-5 | 3.0E−08 | n/a | n.d. | 1.9E−08 | 6.0E−09 | n.d. | n.d. | n.d. | n.d. | n.d. |
| SPG-6 | 8.9E−08 | n/a | n.d. | 3.5E−08 | 5.4E−09 | n.d. | n.d. | n.d. | n.d. | n.d. |
| SPG-7 | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
| SPG-9 | 1.1E−08 | n/a | 3.0E−09 | 1.9E−08 | 8.9E−09 | 1.5E+06 | 7.6E−15 | 2.1E−15 | 1.3E−14 | 6.1E−15 |
| SPG-10 | 4.8E−08 | n/a | 6.1E−09 | 1.0E−08 | 9.7E−09 | 1.0E+06 | 4.6E−14 | 5.9E−15 | 9.7E−15 | 9.3E−15 |
| SPG-11 | 9.4E−09 | n/a | 1.6E−08 | 4.1E−08 | 3.2E−08 | 7.8E+06 | 1.2E−15 | 2.1E−15 | 5.3E−15 | 4.1E−15 |
| SPG-12 | n/a | −1.3E−07 | n.d. | 1.3E−07 | n.d. | n.d | n.d. | n.d. | n.d. | n.d. |
n/a, not applicable; n.d., not determined.