(Uncertain) Carbonyl Sulfide Plant Fluxes Spatially Constrain (Even More Uncertain) CO2 GPP

Abstract:

With predictions of future terrestrial carbon dioxide (CO₂)
gross primary productivity (GPP) remaining stubbornly uncertain,
ecosystem carbonyl sulfide (COS) fluxes provide an independent source of
information that may be able to reduce that uncertainty. Several open
questions must be addressed before COS may be applied widely as a GPP
tracer. Here we employ an atmospheric chemistry and transport model
(STEM) and airborne atmospheric COS concentration observations to
demonstrate that COS plant uptake spatially constrains CO₂ GPP even when
accounting for soil COS flux uncertainty and COS leaf-scale relative
uptake variability and uncertainty.