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Using 18O To Partition Ecosystem Carbon Exchanges: Impact of the Near-surface 18O Value of Soil Water
on 18O Value of the Soil-surface CO2 Flux

William J. Riley

Contact: 510/486-5036, WJRiley@lbl.gov

Research Objectives

Several studies have proposed using measurements of the 18O content of atmospheric CO2 to partition site-level measured net-ecosystem carbon fluxes into component gross fluxes, and at the global scale, to estimate the regional distribution of CO2 fluxes. However, these approaches require accurate prediction of the 18O value of the soil-surface CO2 flux (d118FS ). This work aims to better characterize d118FS and to improve the computational efficiency of models used in global and regional simulations.

To continue reading more about this project, view the 1-page pdf here.

 

 

 

 

 

figure(a) dFS as predicted by ISOLM and the HDMR approach. Also shown is the gradient in dsw ove rthe top 15 cm. (b) Cumulative isoflux from the soil to the atmosphere for the two approaches. The error the three-month growing season was 0.2%.