Eddy correlation measurements to visualize CO2 and water vapor concentrations and fluxes


  • GIORA RYTWO Department of Environmental and Water Sciences, Tel Hai College, Upper Galilee, Israel; Environmental Physical Chemistry Lab, MIGAL Galilee Research Institute, Kiryat Shmona, Israel
  • DAFNA ELIYAHOU Department of Environmental and Water Sciences, Tel Hai College, Upper Galilee, Israel; Environmental Physical Chemistry Lab, MIGAL Galilee Research Institute, Kiryat Shmona, Israel




Eddy correlation/covariance, CO2 -Flux, CO2 conc, water vapor, atmospheric gas fluxes, atmospheric gas concentration


Eddy correlation measures gas exchange between canopy and the overlying atmosphere by evaluating the correlation between fluctuations in the gas-of-interest’s mixing ratio and the vertical wind velocity and considered the most accurate approach for measuring gas fluxes, mostly carbon dioxide and water vapor under ideal homogeneous conditions.  It has been used in micrometeorology for decades to quantify mass and energy transfer between urban, natural and agricultural ecosystems and the atmosphere. We assessed its application under various—homogeneous and non-homogeneous—conditions. Our study indicates that fluxes of CO2 and H2O correlate well with plants activity only when turbulent conditions are present, in open fields. At such conditions, direct measurements of concentration of those gases are not an accurate indicator for plants activity. On the other hand, in closed systems (e.g. greenhouses)- fluxes as measured by an eddy correlation system can't accurately be related to the state of the vegetation, but the fluctuations in the concentrations of CO2 and H2O directly correlate to the actual plants activity. Adapting conditions in greenhouses to limiting factors as temperature, increases CO2 sequestration by plants, and may increase productivity    

Author Biography

DAFNA ELIYAHOU, Department of Environmental and Water Sciences, Tel Hai College, Upper Galilee, Israel; Environmental Physical Chemistry Lab, MIGAL Galilee Research Institute, Kiryat Shmona, Israel




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How to Cite

RYTWO, G., & ELIYAHOU, D. (2023). Eddy correlation measurements to visualize CO2 and water vapor concentrations and fluxes. Journal of Agrometeorology, 25(2), 239–246. https://doi.org/10.54386/jam.v25i2.2103