Table S5.
Summarized carbon fluxes and yields for each two-digit HUC within the conterminous United States (fifth and 95th percentiles in parentheses) and summarized mean NEP calculated from the MsTMIP terrestrial biogeochemistry model (SDs in parentheses)
| Two-digit HUC | Carbon yield, gC⋅m2⋅y−1 (Eq. 2) | MsTMIP NEP, gC⋅m−2⋅y−1 | Maximum potential NEP, % (Eq. 2) | NPP AVG, gC⋅m2⋅y−1 | Total biomass, kgC⋅m2 | Total respiration, gC⋅m−2⋅y−1 |
| 01 | 24 (16.5–33) | 68.5 (48.4) | 35.0 | 599 (134.6) | 9.5 (2.7) | 982 (270.8) |
| 02 | 23.2 (15.1–33.5) | 96.5 (97.3) | 24.0 | 689.8 (286) | 9.5 (4.5) | 1,158.8 (461.5) |
| 03 | 21.2 (15.5–28.2) | 141 (125.8) | 15.0 | 903.3 (355) | 11.5 (5.7) | 1,977 (640.6) |
| 04 | 32 (28.2–36.4) | 86.1 (75) | 37.1 | 623.6 (264.8) | 6.6 (4.6) | 996.7 (376.2) |
| 05 | 27.5 (20.9–35.3) | 107.1 (97.5) | 25.7 | 782.8 (307.4) | 8.3 (4.7) | 1,253.6 (381.9) |
| 06 | 37.8 (21.7–56.6) | 139.3 (134) | 27.1 | 966.4 (246.5) | 13.3 (4.7) | 1,765.8 (408.2) |
| 07 | 20.8 (17.5–25) | 88.7 (94) | 23.5 | 713.4 (296.1) | 3.9 (3.7) | 996.5 (327.3) |
| 08 | 48.3 (38.4–61.3) | 112.1 (132.7) | 43.1 | 812.8 (240.8) | 7.9 (6) | 1,734.9 (586.9) |
| 09 | 14.4 (7.6–24.2) | 76 (73) | 18.9 | 446.2 (219.3) | 3.9 (4.8) | 705.6 (360.7) |
| 10 | 9.1 (7–12) | 53.9 (73.5) | 17.0 | 395.7 (240.5) | 1.7 (2.2) | 598.8 (328.8) |
| 11 | 14.8 (10.7–19.6) | 68.1 (108.2) | 21.7 | 539.2 (258.4) | 3.9 (4.6) | 1,013.7 (540.2) |
| 12 | 14.7 (10.6–20.5) | 54.6 (111.5) | 26.9 | 615.4 (375.2) | 3.3 (4.2) | 974.9 (626.3) |
| 13 | 4.9 (2.5–7.6) | 34.4 (64.7) | 14.2 | 346.1 (194.4) | 1.7 (1.7) | 560.3 (229.9) |
| 14 | 17.3 (10.2–26.2) | 38.8 (51.9) | 44.5 | 250.8 (141.3) | 2.1 (2.2) | 424.7 (211.8) |
| 15 | 4.2 (2.4–6.5) | 21.2 (57.5) | 19.6 | 239.1 (137.1) | 1.3 (1.2) | 439.9 (211.3) |
| 16 | 12.2 (7.6–18) | 29.7 (50.4) | 41.0 | 200.7 (109.7) | 1 (1.1) | 347.5 (169.9) |
| 17 Coast | 44 (26.4–63.3) | 81.8 (57) | 53.8 | 521.6 (159.9) | 8.9 (3.1) | 1,202.9 (346) |
| 17 Dry | 24.3 (14.9–35.3) | 45.8 (56.3) | 53.1 | 322 (166.3) | 3.7 (3.2) | 595.9 (299.2) |
| 18 Dry | 24.7 (14.4–36.4) | 43.5 (66.4) | 56.8 | 319.2 (229) | 3.2 (3.2) | 643.5 (432.7) |
| Average | 18.8 (13.8–24.8) | 70.0 (84.0) | 26.8 | 522.2 (242.6) | 4.7 (3.5) | 925.4 (391.6) |
Maximum potential NEP is the calculated potential contribution of aquatic systems to the NEP term when not accounted for in terrestrial carbon models using Eq. 2 and without (fa). Maximum potential NEP is the hypothetical maximum reduction of NEP that would occur if all carbon in aquatic systems is derived from terrestrial sources and is unaccounted for in a regional carbon balance. Average yields are all calculated weighted by area. AVG, average; kgC, kilograms of carbon.