Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 6 12 2006 10.5194/acp-6-4395-2006 http://www.atmos-chem-phys.net/6/4395/2006/ http://www.atmos-chem-phys.net/6/4395/2006/acp-6-4395-2006.html http://www.atmos-chem-phys.net/6/4395/2006/acp-6-4395-2006.pdf 4395 4402 2006-09-28 Some aspects of the energy balance closure problem T. Foken thomas.foken@uni-bayreuth.de F. Wimmer M. Mauder C. Thomas C. Liebethal Department of Micrometeorology, University of Bayreuth, 95440 Bayreuth, Germany 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. 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