Mathematics – Logic
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3502403r&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 2, CiteID L02403
Mathematics
Logic
2
Biogeosciences: Isotopic Composition And Chemistry (1041, 4870), Global Change: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 4805, 4912), Biogeosciences: Trace Gases, Paleoceanography: Greenhouse Gases, Oceanography: Biological And Chemical: Stable Isotopes (0454, 1041)
Scientific paper
This study examines the broad implications of diffusive transport induced fractionations on the interpretation of isotopic processes in the geophysical environment using the example of gaseous CO2 transport in soils. We use a simple model to simulate isotopic transport of CO2 from soil into a headspace chamber, followed by laboratory validation of predicted values. The combined effects of isotopic and concentration gradients results in an observed fractionation of different magnitude than the accepted theoretical diffusion fractionation, which falls continuously during the headspace equilibration period. We show that isotopic data from a non-steady state diffusive environment can be misinterpreted when steady state diffusion models are applied. The simple processes illustrated here can be extended to any isotopic species, and any diffusive environment where some (or full) equilibration takes place between component species.
Kellman Lisa
Risk David
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