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Global trends in carbon sinks and their relationships with CO2 and temperature
Fernandez-Martinez, M.; Sardans, J.; Chevallier, F.; Ciais, P.; Obersteiner, M.; Vicca, S.; Canadell, J.G.; Bastos, A.; Friedlingstein, P.; Sitch, S.; Piao, S.L.; Janssens, L.A.; Penuelas, J. (2019). Global trends in carbon sinks and their relationships with CO2 and temperature. Nat. Clim. Chang. 9(1): 73-79. https://dx.doi.org/10.1038/s41558-018-0367-7
In: Nature Climate Change. Nature Publishing Group: London. ISSN 1758-678X; e-ISSN 1758-6798
Peer reviewed article  
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  • Fernandez-Martinez, M.
  • Sardans, J.
  • Chevallier, F.
  • Ciais, P.
  • Obersteiner, M.
  • Vicca, S.
  • Canadell, J.G.
  • Bastos, A.
  • Friedlingstein, P.
  • Sitch, S.
  • Piao, S.L.
  • Janssens, L.A.
  • Penuelas, J.
Abstract
    Elevated CO concentrations increase photosynthesis and, potentially, net ecosystem production (NEP), meaning a greater CO uptake. Climate, nutrients and ecosystem structure, however, influence the effect of increasing CO. Here we analysed global NEP from MACC-II and Jena CarboScope atmospheric inversions and ten dynamic global vegetation models (TRENDY), using statistical models to attribute the trends in NEP to its potential drivers: CO, climatic variables and land-use change. We found that an increased CO was consistently associated with an increased NEP (1995–2014). Conversely, increased temperatures were negatively associated with NEP. Using the two atmospheric inversions and TRENDY, the estimated global sensitivities for CO were 6.0 ± 0.1, 8.1 ± 0.3 and 3.1 ± 0.1 PgC per 100 ppm (~1 °C increase), and −0.5 ± 0.2, −0.9 ± 0.4 and −1.1 ± 0.1 PgC °C−1 for temperature. These results indicate a positive CO effect on terrestrial C sinks that is constrained by climate warming.
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