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

ABSTRACT: 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

SUBMITTER: MacBean N 

PROVIDER: S-EPMC5792553 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature