Turbulent exchange over a surface with chessboard-type inhomogeneities

Tsvang, L. R.; Fedorov, M. M.; Kader, B. A.; Zubkovskii, S. L.; Foken, Thomas; Richter, S. H.; Zeleny, Ya.

doi:10.1007/bf00119331

Cited by 43 publications

(20 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was a main topic of a workshop held in 1994 in Grenoble (Foken and Oncley, 1995). In most of the land surface experiments (Bolle et al, 1993;Kanemasu et al, 1992;Tsvang et al, 1991), and also in the carbon dioxide flux networks (Aubinet et al, 2000;Wilson et al, 2002), a closure of the energy balance of approximately 80% was found. The residual is…”

Section: Introductionmentioning

confidence: 98%

Some aspects of the energy balance closure problem

et al. 2006

Self Cite

View full text Add to dashboard Cite

Abstract. After briefly discussing several reasons for the energy balance closure problem in the surface layer, the paper focuses on the influence of the low frequency part of the turbulence spectrum 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 longer than the typical averaging interval of 30 min. Additionally, the eddy-covariance method underestimates turbulent fluxes for maximal ogive functions within the averaging interval, both mainly due to advection and non-steady state conditions. This has a considerable influence on the use of the eddy-covariance method.

show abstract

Section: Introductionmentioning

confidence: 98%

Some aspects of the energy balance closure problem

et al. 2006

Self Cite

View full text Add to dashboard Cite

show abstract

“…In most of the land-surface experiments (Bolle et al 1993;Kanemasu et al 1992;Laubach and Teichmann 1996;Oliphant et al 2004;Oncley et al 2007;Tsvang et al 1991) and also in the carbon dioxide flux networks Wilson et al 2002), a closure of the energy balance of approximately 80% was found. An experiment specifically designed to investigate this problem, the Energy Balance Experiment 2000 (EBEX-2000), took place in the summer of 2000 near Fresno, CA.…”

mentioning

confidence: 97%

Energy balance closure for the LITFASS-2003 experiment

Foken

Mauder

Liebethal

et al. 2009

Theor Appl Climatol

140

108

View full text Add to dashboard Cite

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).

show abstract

“…The discussion was a logical successor to a workshop held in 1994 in Grenoble, France (Foken and Oncley 1995), where the problem of the unclosed surface energy balance-which is where the observed turbulent fluxes of sensible and latent heat do not sufficiently account for the measured net available energy at the Earth's surface-was addressed after energy budget closure analyses in the 1980s and early 1990s (Bolle et al 1993;Kanemasu et al 1992;Koitzsch et al 1988;Laubach and Teichmann 1996;Leuning et al 1982;Tsvang et al 1991). Many of the issues addressed in the 1994 workshop formed the scientific hypothesis for the special Energy Balance Experiment ( EBEX-2000;Oncley et al 2007), but this campaign did not yield a complete solution to the problem.…”

mentioning

confidence: 99%