Arid
DOI10.5194/hess-21-3401-2017
Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa
Majozi, Nobuhle P.1,2; Mannaerts, Chris M.2; Ramoelo, Abel1,5; Mathieu, Renaud1,3; Nickless, Alecia4; Verhoef, Wouter2
通讯作者Majozi, Nobuhle P.
来源期刊HYDROLOGY AND EARTH SYSTEM SCIENCES
ISSN1027-5606
EISSN1607-7938
出版年2017
卷号21期号:7页码:3401-3415
英文摘要

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.


类型Article
语种英语
国家South Africa ; Netherlands ; England
收录类别SCI-E
WOS记录号WOS:000405318600001
WOS关键词SOIL HEAT-STORAGE ; EDDY-COVARIANCE ; NONFLAT TERRAIN ; CARBON-DIOXIDE ; WATER-VAPOR ; WET SEASON ; LONG-TERM ; FOREST ; FLUXES ; GRASSLAND
WOS类目Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Geology ; Water Resources
来源机构University of Oxford
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199523
作者单位1.CSIR, Nat Resources & Environm, Earth Observat Grp, ZA-0001 Pretoria, South Africa;
2.Univ Twente, Fac Geoinformat Sci & Earth Observat ITC, Dept Water Resources, NL-75 AA Enschede, Netherlands;
3.Univ Pretoria, Dept Geog Geoinformat & Meteorol, Pretoria, South Africa;
4.Univ Oxford, Nuffield Dept Primary Care Hlth Sci, Oxford OX2 6GG, England;
5.Univ Limpopo, Risk & Vulnerabil Ctr, ZA-0727 Sovenga, South Africa
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GB/T 7714
Majozi, Nobuhle P.,Mannaerts, Chris M.,Ramoelo, Abel,et al. Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa[J]. University of Oxford,2017,21(7):3401-3415.
APA Majozi, Nobuhle P.,Mannaerts, Chris M.,Ramoelo, Abel,Mathieu, Renaud,Nickless, Alecia,&Verhoef, Wouter.(2017).Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa.HYDROLOGY AND EARTH SYSTEM SCIENCES,21(7),3401-3415.
MLA Majozi, Nobuhle P.,et al."Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa".HYDROLOGY AND EARTH SYSTEM SCIENCES 21.7(2017):3401-3415.
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