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

Beer C., Reichstein M., Tomelleri E., Ciais P., Jung M., Carvalhais N., Rödenbeck C., Arain M.A., Baldocchi D., Bonan G., Bondeau A., Cescatti A., Lasslop G., Lindroth A., Lomas M., Luyssaert S., Margolis H., Oleson K., Roupsard O., Veenendaal E.M., Viovy N., Williams C., Woodward F.I., Papale D.. 2010. Science, 329 : p. 834-838.

Terrestrial gross primary production (GPP) is the largest global CO2 flux driving several ecosystem functions. We provide an observation-based estimate of this flux at 123 T 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. (Résumé d'auteur)

Mots-clés : savane; forêt tropicale; végétation; Écosystème; modèle de simulation; changement climatique; cycle du carbone; dioxyde de carbone; monde

Thématique : Méthodes mathématiques et statistiques; Conservation de la nature et ressources foncières; Foresterie - Considérations générales; Météorologie et climatologie

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