1. Energy balance closure for the LITFASS-2003 experiment
- Author
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Jens Bange, Frank Beyrich, Henk A. R. DeBruin, Thomas Foken, Jens-Peter Leps, Matthias Mauder, Claudia Liebethal, W.M.L. Meijninger, Siegfried Raasch, and Florian Wimmer
- Subjects
Meteorologie en Luchtkwaliteit ,Atmospheric Science ,010504 meteorology & atmospheric sciences ,Meteorology and Air Quality ,experiment ebex-2000 ,water-vapor ,0207 environmental engineering ,Energy balance ,02 engineering and technology ,Surface finish ,sonic anemometer ,flux measurements ,turbulent fluxes ,Residual ,01 natural sciences ,heat-flux ,heterogeneous land-surface ,Latent heat ,large-aperture scintillometer ,020701 environmental engineering ,0105 earth and related environmental sciences ,Hydrology ,WIMEK ,effective roughness length ,Mechanics ,Surface energy ,Heat flux ,Closure (computer programming) ,Available energy ,Environmental science ,eddy-covariance measurements - Abstract
In the first part, this paper synthesises the main results from a series of previous studies on the closure of the local energy balance at low-vegetation sites during the LITFASS-2003 experiment. A residual of up to 25% of the available energy has been found which cannot be fully explained either by the measurement uncertainty of the single components of the surface energy balance or by the length of the flux-averaging period. In the second part, secondary circulations due to heterogeneities in the surface characteristics (roughness, thermal and moisture properties) are discussed as a possible cause for the observed energy balance non-closure. This hypothesis seems to be supported from the fluxes derived from area-averaging measurement techniques (scintillometers, aircraft).
- Published
- 2010
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