Fig. 1.
Observed conditions and COS fluxes in a wheat field from April 4 to June 6, 2012. (A) Soil water content (SWC; blue) and temperature next to the chamber (red) and under the canopy (orange), (B) soil COS fluxes from soil chamber measurements, and (C) calculated at below-canopy soil temperature and SWC (FCOS-s) and net ecosystem COS fluxes measured by eddy covariance (FCOS-e) (15). In C the gray shading indicates the uncertainties in soil fluxes (Supporting Information). In A, there is a disconnect around day 145 because the sensors were removed and replaced for the harvest.