The
stable isotope composition of atmospheric CO2 is being monitored in
five AmeriFlux sites (four forests and one grassland) by collecting air samples
inside and above canopies at weekly intervals. Measurements of concentration, d13C and d18O of
atmospheric CO2
have continuously been made from 100-ml flask
samples since 2001. These measurements, in concert with eddy covariance
flux
measurements, provide mechanistic insights relating observed isotope
changes
and the controls over carbon sequestration and loss on seasonal and
interannual
bases. Data and a brief project description are available via the
Internet at:
http://ecophys.biology.utah.edu/Research/DOE_TCP/index.html.
Author: C.-T. Lai, and J.R. Ehleringer (lai at biology dot utah dot edu)
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