The Effect of Surface Heterogeneity on the Temperature–Humidity Correlation and the Relative Transport Efficiency |
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| Authors: | Arnold F Moene Dirk Schüttemeyer |
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| Institution: | (1) Meteorology and Air Quality Group, Wageningen University, PO Box 47, 6700 AA Wageningen, The Netherlands;(2) Meteorological Institute, University of Bonn, Bonn, Germany |
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| Abstract: | We derive a conceptual model of the flow over heterogeneous terrain consisting of patches with contrasting Bowen ratios. Upward
moving eddies are assumed to carry heterogeneous properties, whereas downward moving eddies carry homogeneous properties.
This results in a decorrelation of temperature and humidity as the contrast between the patches increases. We show that this
model is able to reproduce the relationship developed by Lamaud and Irvine (Boundary-Layer Meteorol. 120:87–109, 2006). Some
details differ from their expression but are in accordance with data obtained over African savannah. We extend the conceptual
model to a combination of any scalars, not necessarily linked through the surface energy balance (as is the case for temperature
and humidity). To this end we introduce a new parameter that describes the surface heterogeneity in surface fluxes. The results
of the current model can be used to predict the discrepancy between similarity relationships for different scalars over heterogeneous
terrain. |
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| Keywords: | Bkowen ratio Surface heterogeneity Surface layer similarity θ – q-correlation Variance method |
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