Table S3.

Estimates of net ecosystem exchange (NEE) from Regional Carbon Cycle Assessment and Processes (RECCAP) international research project

RegionFluxPeriodMean, Tg C⋅y−1Uncertainty, Tg C⋅y−1References in the mass balance calculation
North AmericaNEE2000–2009−418288King et al. (27); Peters et al. (40)
EuropeNEE2000–2007−234166Luyssaert et al. (26); Peters et al. (40); Hartmann et al. (41)
RussiaNEE2007–2009−600224Dolman et al. (42); Hartmann et al. (41)
South AsiaNEE2000–2009−8634Liu et al. (28); Peters et al. (40); Hartmann et al. (41)
East AsiaNEE2000–2009−25635Piao et al. (25); Lauerwald et al. (43); Peters et al. (40); Hartmann et al. (41)
Southeast AsiaNEEUndefined−97186Liu et al. (28); Peters et al. (40); Hartmann et al. (41)
South AmericaNEE2000–200911284Gloor et al. (44); Peters et al. (40); Hartmann et al. (41)
AfricaNEE2000–200712292Pan et al. (22); Valentini et al. (45); Peters et al. (40); Hartmann et al. (41)
AustraliaNEE1990–2011−7136Haverd et al. (46); Hartmann et al. (41)
GlobeNEE2000–2009−1,740604Sum of regional NEE
B + L2000–2009−1,290611NEE corrected for river outgassing to ocean (16)
  • In brief, the observed carbon fluxes in the nine regions were evaluated and summed to give the global fluxes. NEE is calculated from the mass balance of the change in territorial carbon stocks and the lateral carbon fluxes (soil carbon export to river, river outgassing to ocean, crop and wood export) in each region. The global NEE corrected for river outgassing flux (16) is used to constrain B + L in this study. Negative values indicate a flux from the atmosphere to the land.