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dc.contributor.author Jovanovic, Nebojsa
dc.contributor.author Mu, Q
dc.contributor.author Bugan, Richard DH
dc.contributor.author Zhao, M
dc.date.accessioned 2015-10-30T09:44:27Z
dc.date.available 2015-10-30T09:44:27Z
dc.date.issued 2015-01
dc.identifier.citation Jovanovic, N., Mu, Q., Bugan, R.D.H and Zhao, M. 2015. Dynamics of MODIS evapotranspiration in South Africa. Water SA, Vol 41(1), pp 79-90 en_US
dc.identifier.issn 0378-4738
dc.identifier.uri http://www.ajol.info/index.php/wsa/article/view/112109
dc.identifier.uri http://hdl.handle.net/10204/8211
dc.description Copyright: 2015. South African Water Research Commission en_US
dc.description.abstract This paper describes the dynamics of evapotranspiration (ET) in South Africa using MOD16 ET satellite-derived data, and analyses the inter-dependency of variables used in the ET algorithm of Mu et al. (2011). Annual evapotranspiration is strongly dependent on rainfall and potential evapotranspiration (PET) in 4 climatically different regions of South Africa. Average ET in South Africa (2000–2012) was estimated to be 303 mm·a-1 or 481.4 x 109 m3·a1 (14% of PET and 67% of rainfall), mainly in the form of plant transpiration (T, 53%) and soil evaporation (Soil E, 39%). Evapotranspiration (ET) showed a slight tendency to decrease over the period 2000–2012 in all climatic regions, except in the south of the country (winter rainfall areas), although annual variations in ET resulted in the 13-year trends not being statistically significant. Evapotranspiration (ET) was spatially dependent on PET, T and vapour pressure deficit (VPD), in particular in winter rainfall and arid to semi-arid climatic regions. Assuming an average rainfall of 450 mm·a-1, and considering current best estimates of runoff (9% of rainfall), groundwater recharge (5%) and water withdrawal (2%), MOD16 ET estimates were about 15% short of the water balance closure in South Africa. The ET algorithm can be refined and tested for applications in restricted areas that are spatially heterogeneous and by accounting for soil water supply limiting conditions. en_US
dc.language.iso en en_US
dc.publisher South African Water Research Commission en_US
dc.relation.ispartofseries Workflow;14430
dc.subject MOD16 ET satellite-derived data en_US
dc.subject Potential evapotranspiration en_US
dc.subject Soil evaporation en_US
dc.subject Transpiration en_US
dc.subject Water balance en_US
dc.title Dynamics of MODIS evapotranspiration in South Africa en_US
dc.type Article en_US


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