The oxygen isotopic composition of atmospheric CO2 can help
constrain local- to global-scale biophysical processes and partition measured
net ecosystem CO2 fluxes into gross fluxes. Although current models
still lack key features controlling gross ecosystem CO18O fluxes,
considerable improvements have been achieved in the last four years. In this
study we examine the influence on atmospheric CO18O of 1) a delayed
seasonal cycle in soil water isotopes (relative to rain water) and 2) a new
one-way flux model of night-time leaf respiration [Cernusak et
al., 2004]. The latter covaries with enhanced night-time stomatal
conductance, for which evidence arose recently [e.g. Snyder et
al., 2003].
Author: M. Cuntz, W.J. Riley, and G.D. Farquhar (Matthias dot Cuntz at anu dot edu dot au)
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