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Variations of Turbulent Fluxes in the Atmospheric Surface Layer According to the Presence of Cloud  

de Oliveira Junior, Jose Francisco (Departamento de Meteorologia, University Federal de Rio de Janeiro)
Kwon, Byung-Hyuk (Department of Environmental Atmospheric Sciences, Pukyong National University)
Publication Information
Journal of the Korean earth science society / v.25, no.2, 2004 , pp. 87-93 More about this Journal
Abstract
To study the effect of cloud on the variabilities of turbulent fluxes over the flat terrain, we used the gradient method to analyze the dynamic and thermodynamic data from the meteorological 9-m mast (0.75, 3 and 9 m) in Villafria airport in Spain. The decrease of the surface wind speed is governed by cooling at the surface following the evening transition. The sensible heat flux and the momentum flux are increased with the dynamic factor rather than the thermodynamic factor, and the sensible heat flux was not affected by the thermal condition. The global radiation did not play an important role in the variation of the sensible heat flux in the cloudy day, but the atmospheric surface layer was characterized rather by the wind intensity.
Keywords
gradient method; radiation; cloud; sensible heat flux; momentum flux;
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