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Variability of Stability, Momentum and Heat Fluxes in the Stable Boundary Layer over Highveld Priority Area, South Africa

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Author(s): Philbert M. Luhunga | Edmund Mutayoba

Journal: Applied Physics Research
ISSN 1916-9639

Volume: 5;
Issue: 4;
Date: 2013;
Original page

ABSTRACT
In this paper, we present the micro-spatial scale and temporal variability of Obukhov length (L), Kinematic momentum flux or turbulent friction velocity (­) and heat flux () in the Stable Boundary Layer (SBL) using observational data collected by a dense network of five Automatic Weather Stations (AWSs). The stations were in operation in the Highveld Priority Area (HPA) of the Republic of South Africa during 2008-2010. The L, ­ and  are solved using Monin Obukhov similarity theory. Analysis of spatial variability of stability regimes as presented by L suggests that HPA is dominated by strong stability regime. The analysis also revealed inter-station variability of and L while indicates no significant spatial variability between stations. Temporal variability showed that most of the low values for Obukhov length that fall within strong stable regimes (0
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