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Carbon Dioxide Exchange And Nocturnal Processes Over A Mixed Deciduous Forest

  • Sites: CA-Cbo
  • Lee, X., Black, T., den Hartog, G., Neumann, H. H., Nesic, Z., Olejnik, J. (1996/09) Carbon Dioxide Exchange And Nocturnal Processes Over A Mixed Deciduous Forest, Agricultural And Forest Meteorology, 81(1-2), 13-29. https://doi.org/10.1016/0168-1923(95)02310-0
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    • This paper reports the results of the analysis of CO2 exchange from a one-month experiment conducted at a mixed deciduous forest, Camp Borden (80°65′W, 44°19′ N), Canada, in the summer of 1993. The mid-day CO2 flux from the forest under clear sky conditions was around −1.0 mg m−2 s−1, the average light and water use efficiencies 13 mmol CO2(mol photon)−1 and 7.95 mg CO2(gH2O)−1 , and the average nocturnal respiration rate 0.21 mg CO2m−2s−1.

    We observed different flow features at heights of 34.5 (14.5 m above the canopy) and 22.4 m at night. Wavelike structures were frequently encountered at z = 34.5 m. Depending on the phase angle between the vertical velocity and CO2 concentration time series, they could act to enhance the co-gradient (upward) flux or to create counter-gradient (downward) flux of CO2. We speculate that the wave events were limited to isolated regions in the upwind direction. Near the tree-tops (z = 22.4 m), the strong wind shear was able to maintain turbulence. Inverse temperature ramp structures were very common and flux of sensible heat was well behaved (directed downward).