Terrestrial gross carbon dioxide uptake: global distribution and covariation with climate.
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.
Beer
Christian
C
Biogeochemical Model-Data Integration Group, Max Planck Institute for Biogeochemistry, 07745 Jena, Germany. christian.beer@bgc-jena.mpg.de
Reichstein
Markus
M
Tomelleri
Enrico
E
Ciais
Philippe
P
Jung
Martin
M
Carvalhais
Nuno
N
Rödenbeck
Christian
C
Arain
M Altaf
MA
Baldocchi
Dennis
D
Bonan
Gordon B
GB
Bondeau
Alberte
A
Cescatti
Alessandro
A
Lasslop
Gitta
G
Lindroth
Anders
A
Lomas
Mark
M
Luyssaert
Sebastiaan
S
Margolis
Hank
H
Oleson
Keith W
KW
Roupsard
Olivier
O
Veenendaal
Elmar
E
Viovy
Nicolas
N
Williams
Christopher
C
Woodward
F Ian
FI
Papale
Dario
D
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
D014867:Water; D002245:Carbon Dioxide