Air temperature Psychrometer developed at Edinburgh Univ. Wet bulb temperature Psychrometer developed at Edinburgh Univ. Soil temperatures Probe developed at Edinburgh Univ. All measurements were made at the Southern Study Area Old Black Spruce site. The measurements were made almost continuously from 23 May until 19 September 1994 except the soil and stem CO 2 efflux, which were made at sub intervals of the above period.
Eddy covariance is used to measure the flux through a horizontal plane, placed above the canopy.
In very stable conditions, i.e. cloudless nights with little wind, there is almost no such flux. In such conditions the storage of CO 2 in the canopy is measured to estimate the flux in and out of the biological system. However, in extremely stable conditions this storage of CO 2 also appears to be underestimated. Simple modeling can be used to circumvent this problem. Click on a team designation to go to that page.