Prerequisites for application of hyperbolic relaxed eddy accumulation on 
managed grasslands and alternative net ecosystem exchange flux partitioning

Riederer, M.; Hübner, J.; Ruppert, J.; Brand, Willi A.; Foken, T.

doi:10.5194/amt-7-4237-2014

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Prerequisites for application of hyperbolic relaxed eddy accumulation on managed grasslands and alternative net ecosystem exchange flux partitioning

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Brand, Willi A.
Service Facility Stable Isotope, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Citation

Riederer, M., Hübner, J., Ruppert, J., Brand, W. A., & Foken, T. (2014). Prerequisites for application of hyperbolic relaxed eddy accumulation on managed grasslands and alternative net ecosystem exchange flux partitioning. Atmospheric Measurement Techniques, 7(12), 4237-4250. doi:10.5194/amt-7-4237-2014.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-8A31-E

Abstract

Relaxed eddy accumulation is applied for measuring fluxes of trace gases for which there is a lack of sensors fast enough in their resolution for eddy-covariance. On managed grasslands, the length of time between management events and the application 5 of relaxed eddy accumulation has an essential influence on the determination of the proportionality factor b and thereby on the resulting flux. In this study this effect is discussed for the first time. Also, scalar similarity between proxy scalars and scalars of interest is affected until the ecosystem has completely recovered. Against this background, CO2 fluxes were continuously measured and 13CO2 isofluxes were determined 10 with a high measurement precision on two representative days in summer 2010. This enabled the evaluation of the 13CO2 flux portion of the entire CO2 flux, in order to estimate potential influences on tracer experiments in ecosystem sciences and to compare a common method for the partitioning of the net ecosystem exchange into assimilation and respiration based on temperature and light response with an isotopic approach 15 directly based on the isotope discrimination of the biosphere.