Strong constraint on modelled global carbon uptake using solar-induced chlorophyll fluorescence data - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Scientific Reports Année : 2018

Strong constraint on modelled global carbon uptake using solar-induced chlorophyll fluorescence data

Résumé

Accurate terrestrial biosphere model (TBM) simulations of gross carbon uptake (gross primary productivity-GPP) are essential for reliable future terrestrial carbon sink projections. However, uncertainties in TBM GPP estimates remain. Newly-available satellite-derived sun-induced chlorophyll fluorescence (SIF) data offer a promising direction for addressing this issue by constraining regional-to-global scale modelled GPP. Here, we use monthly 0.5° GOME-2 SIF data from 2007 to 2011 to optimise GPP parameters of the ORCHIDEE TBM. The optimisation reduces GPP magnitude across all vegetation types except C4 plants. Global mean annual GPP therefore decreases from 194 ± 57 PgCyr −1 to 166 ± 10 PgCyr −1 , bringing the model more in line with an up-scaled flux tower estimate of 133 PgCyr −1. Strongest reductions in GPP are seen in boreal forests: the result is a shift in global GPP distribution, with a ~50% increase in the tropical to boreal productivity ratio. The optimisation resulted in a greater reduction in GPP than similar ORCHIDEE parameter optimisation studies using satellite-derived NDVI from MODIS and eddy covariance measurements of net CO 2 fluxes from the FLUXNET network. Our study shows that SIF data will be instrumental in constraining TBM GPP estimates, with a consequent improvement in global carbon cycle projections.
Fichier principal
Vignette du fichier
s41598-018-20024-w.pdf (5.76 Mo) Télécharger le fichier
s41598-018-28697-z.pdf (673.08 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-02398300 , version 1 (17-09-2020)

Identifiants

Citer

Natasha Macbean, Fabienne Maignan, Cedric Bacour, Philip Lewis, Philippe Peylin, et al.. Strong constraint on modelled global carbon uptake using solar-induced chlorophyll fluorescence data. Scientific Reports, 2018, 8, pp.1973. ⟨10.1038/s41598-018-20024-w⟩. ⟨hal-02398300⟩
60 Consultations
47 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More