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Foken, Thomas ; Wimmer, Florian ; Mauder, Matthias ; Thomas, Christoph ; Liebethal, Claudia:
Some aspects of the energy balance closure problem.
In: Atmospheric Chemistry and Physics Discussions.
Bd. 6
(2006)
.
- S. 3381-3402.
ISSN 1680-7375
DOI: https://doi.org/10.5194/acpd-6-3381-2006
Abstract
After briefly discussing several reasons for the energy balance closure problem in thesurface layer, the paper focuses on the influence of the low frequency part of the turbulencespectrum on the residual. Changes in the turbulent fluxes in this part of the turbulence spectrum were found to have a significant influence on the changes of the residual. Using the ogive method, it was found that the eddy-covariance method underestimates turbulent fluxes in the case of ogives converging for measuring times underestimates longer than the typical averaging interval of 30 min. Additionally, the eddy-covariancemethod underestimates turbulent fluxes for maximal ogive functions within the averaginginterval, both mainly due to advection and non-steady state conditions. This has a considerable influence on the use of the eddy-covariance method.