Show simple item record Majozi, Nobuhle P. Mannaerts, Chris M. Ramoelo, Abel Mathieu, Renaud Nickless, Alecia Verhoef, Wouter 2019-10-30T07:17:12Z 2019-10-30T07:17:12Z 2017
dc.identifier.issn 1027-5606 (Print)
dc.identifier.issn 1607-7938 (Online)
dc.description Journal article published in the journal of Hydrology and Earth System Sciences 21, 3401–3415, 2017 en_US
dc.description.abstract Flux towers provide essential terrestrial climate, water, and radiation budget information needed for environmental monitoring and evaluation of climate change impacts on ecosystems and society in general. They are also intended for calibration and validation of satellite-based Earth observation and monitoring efforts, such as assessment of evapotranspiration from land and vegetation surfaces using surface energy balance approaches. In this paper, 15 years of Skukuza eddy covariance data, i.e from 2000 to 2014,were analysed for surface energy balance closure(EBC) and partitioning. The surface energy balance closure was evaluated using the ordinary least squares regression(OLS) of turbulent energy fluxes (sensible(H)and latent heat (LE)) against available energy (net radiation (Rn) less soil heat(G)),and the energy balance ratio(EBR). Partitioning of the surface energy during the wet and dry seasons was also investigated, as well as how it is affected by atmospheric vapour pressure deficit (VPD), and net radiation. After filtering years with low-quality data (2004–2008), our results show an overall mean EBR of 0.93. Seasonal variations of EBR also showed the wet season with 1.17 and spring (1.02) being closest to unity, with the dry season (0.70) having the highest imbalance. Nocturnal surface energy closure was very low at 0.26, and this was linked to low friction velocity during night-time, with results showing an increase in closure with increase in friction velocity. The energy partition analysis showed that sensible heat flux is the dominant portion of net radiation, especially between March and October, followed by latent heat flux, and lastly the soil heat flux, and during the wet season where latent heat flux dominated sensible heat flux. An increase in net radiation was characterized by an increase in both LE and H, with LE showing a higher rate of increase than H in the wet season, and the reverse happening during the dry season. An increase in VPD is correlated with a decrease in LE and increase in H during the wet season, and an increase in both fluxes during the dry season. en_US
dc.format.extent 15 pages en_US
dc.language.iso en en_US
dc.publisher Hydrology and Earth System Sciences en_US
dc.relation.requires Adobe Acrobat Reader en_US
dc.subject Flux towers en_US
dc.subject Terrestrial climate en_US
dc.subject Semi-arid savanna en_US
dc.subject Kruger National Park, Skukuza en_US
dc.subject.lcsh Climatic changes -- South Africa en_US
dc.subject.lcsh Ecosystem management en_US
dc.subject.lcsh Arid regions en_US
dc.subject.lcsh Savanna ecology en_US
dc.title Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa en_US
dc.type Article en_US

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