title: Terrestrial gross carbon dioxide uptake: global distribution and covariation with climate.
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 +/- 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.
authors.affiliation: Biogeochemical Model-Data Integration Group, Max Planck Institute for Biogeochemistry, 07745 Jena, Germany. christian.beer@bgc-jena.mpg.de
authors.forename: Christian
authors.initials: C
authors.lastname: Beer
authors.forename: Markus
authors.initials: M
authors.lastname: Reichstein
authors.forename: Enrico
authors.initials: E
authors.lastname: Tomelleri
authors.forename: Philippe
authors.initials: P
authors.lastname: Ciais
authors.forename: Martin
authors.initials: M
authors.lastname: Jung
authors.forename: Nuno
authors.initials: N
authors.lastname: Carvalhais
authors.forename: Christian
authors.initials: C
authors.lastname: Rödenbeck
authors.forename: M Altaf
authors.initials: MA
authors.lastname: Arain
authors.forename: Dennis
authors.initials: D
authors.lastname: Baldocchi
authors.forename: Gordon B
authors.initials: GB
authors.lastname: Bonan
authors.forename: Alberte
authors.initials: A
authors.lastname: Bondeau
authors.forename: Alessandro
authors.initials: A
authors.lastname: Cescatti
authors.forename: Gitta
authors.initials: G
authors.lastname: Lasslop
authors.forename: Anders
authors.initials: A
authors.lastname: Lindroth
authors.forename: Mark
authors.initials: M
authors.lastname: Lomas
authors.forename: Sebastiaan
authors.initials: S
authors.lastname: Luyssaert
authors.forename: Hank
authors.initials: H
authors.lastname: Margolis
authors.forename: Keith W
authors.initials: KW
authors.lastname: Oleson
authors.forename: Olivier
authors.initials: O
authors.lastname: Roupsard
authors.forename: Elmar
authors.initials: E
authors.lastname: Veenendaal
authors.forename: Nicolas
authors.initials: N
authors.lastname: Viovy
authors.forename: Christopher
authors.initials: C
authors.lastname: Williams
authors.forename: F Ian
authors.initials: FI
authors.lastname: Woodward
authors.forename: Dario
authors.initials: D
authors.lastname: Papale
mesh_terms: D001185:Artificial Intelligence; D001272:Atmosphere; D002245:Carbon Dioxide / Q000378:metabolism*; D002980:Climate; D055907:Climatic Processes; D017753:Ecosystem; D005843:Geography; D008954:Models, Biological; D015233:Models, Statistical; D016571:Neural Networks, Computer; D010101:Oxygen Consumption; D010788:Photosynthesis; D018515:Plant Leaves / Q000378:metabolism*; D010944:Plants / Q000378:metabolism*; D013696:Temperature; D014197:Trees / Q000378:metabolism; D035501:Uncertainty; D014867:Water
chemical_list: D014867:Water; D002245:Carbon Dioxide