Eddy covariance - estimating ecosystem fluxes of carbon and water Asko Noormets, Jiquan Chen Dept. Earth, Ecological and Environmental Sciences The University of Toledo Ge Sun, Steve McNulty Southern Global Change Program, USDA FS. Outline. Background - brief theory and history
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Theoretical framework - Sir Osborne Reynolds (1895)
First application - Scrase (1930),momentum transfer, analog instruments
Also later, post WW II experiments, mostly focused on measuring the turbulent structure of atmospheric boundary layer rather than CO2 exchange.
First measurements of CO2 flux -Desjardins & Lemon (1974)
First measurements over forests -Baumgartner (1969), Denmead (1969), Jarvis (1976)
First application of open-path IRGA-s and sonic anemometers for CO2 flux measurements -Anderson et al. (1984), Anderson & Verma (1986), Ohtaki (1984), Desjardins (1985)
First yearlong study - Wofsy et al. (1993), started in 1990
Flux measurement networks - Fluxnet, Ameriflux, CarboEuroflux etc.
Current questions - sources of interannual variation, winter fluxes, separating contribution from layers, separating soil heterotrophic and autotrophic R.
NEE – net ecosystem exchange
R – ecosystem respiration
GEP – gross ecosystem productivity