Located at the top of the tower, the eddy covariance system is comprised of a sonic anemometer to measure temperature and wind velocities in three directions and an infrared gas analyzer to measure CO2 and water vapor concentrations.
The eddy covariance systems are sampled ten times per second. These high frequency data are used to compute the “eddy fluxes” at half-hour intervals. The eddy fluxes represents the net vertical movement of gases and heat at the measurement height.
We use the eddy flux in conjunction with the storage flux derived from profile measurements to calculate the net ecosystem exchanges of gases and heat.
Time series of air temperature (Tair), carbon dioxide concentration (χCO2), latent heat flux (LE), sensible heat flux (H) and net ecosystem carbon dioxide exchange (NEE) at MOFLUX. The carbon dioxide concentration growth rate (2.57 ppm/yr) is consistent with the global mean growth rate.
MOFLUX 