Tropical
drought can significantly impact inter-annual variations in the terrestrial CO2
fluxes. Concentrations and carbon
isotope ratios of atmospheric CO2 can help to quantify this impact,
however, their use requires a model estimation of the terrestrial isotope
disequilibirum, i.e. the difference between the isotopic signature of
photosynthesis and respiration, which can only be achieved by accurately accounting
for changes in relative contributions of C3 and C4 plants (C4 fraction) and
physiological effects of root-zone water stress.
Author: N.S. Suits, A.S. Denning, and J.B. Miller (nsuits at atmos dot colostate dot edu)
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