Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.5194/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
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ISSN | 1027-5606 |
EISSN | 1607-7938 |
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 |
推荐引用方式 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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