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Terrestrial gross carbon dioxide uptake: Global distribution and covariation with climate

Christian Beer 1, * Markus Reichstein 1 Enrico Tomelleri 1 Philippe Ciais 2, 3 Martin Jung 1 Nuno Carvalhais 1, 4 Christian Rödenbeck 5 M. Altaf Arain 6 Dennis Baldocchi 7 Gordon B. Bonan 8 Alberte Bondeau 9 Alessandro Cescatti 10 Gitta Lasslop 1 Anders Lindroth 11 Mark Lomas 12 Sebastiaan Luyssaert 13 Hank Margolis 14 Keith W. Oleson 8 Olivier Roupsard 15, 16 Elmar Veenendaal 17 Nicolas Viovy 2, 18 Christopher Williams 19 F. Ian Woodward 12 Dario Papale 20
Abstract : Terrestrial gross primary production (GPP) is the largest global CO$_2$ flux driving several ecosystem functions. We provide an observation-based estimate of this flux at 123$\pm$8 petagrams of carbon per year (Pg C year$^{−1}$) using eddy covariance flux data and various diagnostic models. Tropical forests and savannahs account for 60%. GPP over 40% of the vegetated land is associated with precipitation. State-of-the-art process-oriented biosphere models used for climate predictions exhibit a large between-model variation of GPP’s latitudinal patterns and show higher spatial correlations between GPP and precipitation, suggesting the existence of missing processes or feedback mechanisms which attenuate the vegetation response to climate. Our estimates of spatially distributed GPP and its covariation with climate can help improve coupled climate–carbon cycle process models.
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Christian Beer, Markus Reichstein, Enrico Tomelleri, Philippe Ciais, Martin Jung, et al.. Terrestrial gross carbon dioxide uptake: Global distribution and covariation with climate. Science, American Association for the Advancement of Science, 2010, 329 (5993), pp.834. ⟨10.1126/science.1184984⟩. ⟨cea-00819125⟩

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