Gross Primary Productivity of Four European Ecosystems Constrained by Joint CO₂ and COS Flux Measurements.

ABSTRACT: Gross primary productivity (GPP), the gross uptake of carbon dioxide (CO₂) by plant photosynthesis, is the primary driver of the land carbon sink, which presently removes around one quarter of the anthropogenic CO₂ emissions each year. GPP, however, cannot be measured directly and the resulting uncertainty undermines our ability to project the magnitude of the future land carbon sink. Carbonyl sulfide (COS) has been proposed as an independent proxy for GPP as it diffuses into leaves in a fashion very similar to CO₂, but in contrast to the latter is generally not emitted. Here we use concurrent ecosystem-scale flux measurements of CO₂ and COS at four European biomes for a joint constraint on CO₂ flux partitioning. The resulting GPP esti

SUBMITTER: Spielmann FM 

PROVIDER: S-EPMC6686783 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature