Table 1.
The global carbon budget for 1990–2007, updated and inclusive with all terrestrial fluxes attributed to processes or regions
| Flux (1990−2007) | |||
| Carbon budget component | Average annual flux, Pg C⋅y−1 | Uncertainty, Pg C⋅y−1 | Source |
| Atmospheric increase (AI) | 3.6 | 0.4 | GCP |
| Fossil plus cement (FpC) | 6.9 | 0.1 | GCP |
| Tropical gross deforestation (TGD) | 2.9 | 0.5 | (35) |
| Ocean uptake (OU) | −2.3 | 0.5 | GCP |
| Tropical regrowth after deforestation (TRD) | −1.6 | 0.5 | (35) |
| Northern extratropical uptake (all processes) (NEU) | −1.2 | 0.1 | combined |
| Tropical plus southern CO2 effect uptake (TpS) | −1.4 | 0.4 | combined |
This table combines the GCP 2013 carbon budget with the additional flux estimates derived in this paper. This budget has a residual error of 0.3 Pg C⋅y−1, within the uncertainty of the total budget (1 Pg C⋅y−1). The values in the NEU and TpS rows are weighted means of Pan et al. (35) and TRENDY estimates (see SI Text). Note that most carbon budgets (e.g., GCP) include a terrestrial term estimated by difference and so sum to zero. Budget summary: AI = FpC + TGF + OU + TRD + NEU + TpS + residual (uncertainty); 3.6 = 6.9 + 2.9–2.3–1.6–1.2–1.4 + 0.3 (1.0).