A modeling study of the impact of the δ18O value of near-surface soil water on the δ18O value of the soil-surface CO2 flux

Details A modeling study of the impact of the δ18O value of near-surface soil water on the δ18O value of the soil-surface CO2 flux A modeling study of the impact of the δ18O value of near-surface soil water on the δ18O value of the soil-surface CO2 flux

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005gecoa..69.1939r&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 69, Issue 8, p. 1939-1946.

Physics

8

Scientific paper

Measurements of 18O in atmospheric CO2 have been used to partition site-level measured net ecosystem CO2 fluxes into gross fluxes and as a constraint on land surface biophysical processes at regional and global scales. However, these approaches require prediction of the δ18O value of the net CO2 flux between the soil and atmosphere (δF), a quantity that is difficult to measure and accurately predict. δF depends on the depth-dependent δ18O value of soil water (δsw), soil moisture and temperature, soil CO2 production, and the δ18O value of above-surface CO2. I applied numerical model manipulations, regression analysis, a simple estimation method, and an analysis of the characteristic times of relevant processes to study the impacts of these parameters on δF. The results indicate that ignoring δsw gradients in the near-surface soil can lead to large errors. In particular, in systems where δsw gradients exist, generalizing previous experimental observations to infer that a bulk (e.g., 5 10 cm or 5 15 cm depth) estimate of δsw can be used to estimate δF is problematic. These results highlight the need for further experiments and argue for the importance of accurately resolving near-surface δsw in the context of partitioning ecosystem CO2 fluxes and CO2 source attribution.

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