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| 1 | Comparison of two remote sensing models for estimating evapotranspiration: algorithm evaluation and application in seasonally arid ecosystems in South Africa显示文摘Remote sensing tools are becoming increasingly important for providing spatial information on water use by different ecosystems. Despite significant advances in remote sensing based evapotranspiration(ET) models in recent years, important information gaps still exist on the accuracy of the models particularly in arid and semi-arid environments. In this study, we evaluated the Penman-Monteith based MOD16 and the modified Priestley-Taylor(PT-JPL) models at the daily time step against three measured ET datasets. We used data from two summer and one winter rainfall sites in South Africa. One site was dominated by native broad leaf and the other by fine leafed deciduous savanna tree species and C4 grasses. The third site was in the winter rainfall Cape region and had shrubby fynbos vegetation. Actual ET was measured using open-path eddy covariance systems at the summer rainfall sites while a surface energy balance system utilizing the large aperture boundary layer scintillometer was used in the Cape. Model performance varied between sites and between years with the worst estimates(R2<0.50 and RMSE>0.80 mm/d) observed during years with prolonged mid-summer dry spells in the summer rainfall areas. Sensitivity tests on MOD16 showed that the leaf area index, surface conductance and radiation budget parameters had the largest effect on simulated ET. MOD16 ET predictions were improved by:(1) reformulating the emissivity expressions in the net radiation equation;(2) incorporating representative surface conductance values;and(3) including a soil moisture stress function in the transpiration sub-model. Implementing these changes increased the accuracy of MOD16 daily ET predictions at all sites. However, similar adjustments to the PT-JPL model yielded minimal improvements. We conclude that the MOD16 ET model has the potential to accurately predict water use in arid environments provided soil water stress and accurate biome-specific parameters are incorporated. | Sebinasi DZIKITI Nebo Z JOVANOVIC Richard DH BUGAN Abel RAMOELO Nobuhle P MAJOZI Alecia NICKLESS Moses A CHO David C LE MAITRE Zanele NTSHIDI Harrison H PIENAAR | 2019 | Journal of Arid Land2019，11，4： | 4 |
| 2 | Burnout,engagement,coping and general health of service employees in the hospitality industry显示文摘 | JACOBUS PIENAAR SHARRON A WILLEMSE | 2008 | Tourism Management2008，29，6： | 1 |
| 3 | Magnetic resonance imaging of miliary tuberculosis of the central nervous system in children with tuberculous meningitis显示文摘 | Pieter Janse van Rensburg Savvas Andronikou Ronald Toorn Manana Pienaar | 2008 | Pediatric Radiology2008，，12： | 1 |
| 4 | Competitive intelligence: construct exploration, validation and equivalence 显示文摘 | Saayman A Pienaar J de Pelsmacker P | 2008 | Aslib Proceedings: New Information Perspectives2008，60，4： | 1 |
| 5 | A quantitative method for correlating observations of decreased appa- rent diffusion eoefficient with elevated cerebral blood perfusion in newborns presenting cerebral ischemie insuhs显示文摘 | Pienaar R Paldino M J Madan N | 2012 | Neuroimage2012，63，3： | 1 |
| 6 | The pathology of ephemeral fever: A study of the experimental disease in cattle 显示文摘 | Basson P A Pienaar J G Van Der Westhuizzen B | 1970 | J S Afr Vet Med Assoc1970，40，： | 1 |
| 7 | A review of cannibalism and its implications in fish larviculture显示文摘 | Hecht T Pienaar A G | 1993 | J World Aqu Soc1993，24，24： | 1 |
| 8 | Interventions for the prevention and management of oropharyngeal candidiasis associated with HIV infection in adults and children 显示文摘 | Pienaar ED Young T Holmes H | 2006 | Cochrane Database Syst Rev2006，3，00： | 1 |
| 9 | Viscocanalostony for open-angle glaucoma in black african patients显示文摘 | Stegmann R Pienaar A Miller D | 1999 | J Cataract Refract Surg1999，25，3： | 1 |
| 10 | Kinetics and mechanism of the oxidation of sulfur(IV) by ozone in aqueous solutions显示文摘 | BOTHA C F HAHN J PIENAAR J J | 1994 | Atmospheric Environment1994，28，20： | 1 |
| 11 | Basal area prediction and pro- jection equations for pine plantations显示文摘 | Pienaar L V Shiver B D | 1986 | Forest Science1986，32，3： | 1 |
| 12 | The taxonomy of the order lsochrysidales (Prymnesiophyceae) with special reference to the genera lsochrysis Parke, Dicrateria Parke and lmantonia Reynolds 显示文摘 | GREEN J C PIENAAR R N | 1977 | J Mar Bio Ass U K1977，57，： | 1 |
| 13 | Brown tides and maricul- ture in Saldanha Bay, South Africa 显示文摘 | Probyn T Pitcher G Pienaar R | 2001 | Marine pollution bulle- tin2001，42，5： | 1 |
| 14 | A Review of cannibalism and itsimplications in fish Larviculture显示文摘 | HECHT T PIENAAR A G | 1993 | World AquacultureSociety1993，24，： | 1 |
| 15 | Burnout, engagement, coping and general health of service employees in the hospitality industry 显示文摘 | Jacobus Pienaar Sharron AW | 2008 | Tourism Management2008，29，10： | 1 |
| 16 | Polymorphic variation in TIRAP is not associated with susceptibility to childhood TB but may determine susceptibility to TBM in some ethnic groups显示文摘 | Dissanayeke SR Levin S Pienaar S | | 0，，： | 1 |
| 17 | The isolation of a paramyxovirus from pigeons in South Africa 显示文摘 | Pienaar A C Cilliers J A | 1987 | Onderstepoort J Vet Res1987，54，4： | 1 |
| 18 | A quantitative method for correlating observations of decreased apparent diffusion coefficient with elevated cerebral blood perfusion in newborns presenting cerebral ischemic insults显示文摘 | Pienaar R Paldino M J Madan N | | 0，，3： | 1 |
| 19 | Different male morphs of Otitesella pseudoserrata fig wasps have equal fitness but are not determined by different alleles显示文摘 | Pienaar J Greeff J M | 2003 | Ecol Letters2003，6，4： | 1 |
| 20 | The effect of planting density on dominant height in unthinned slash pine plantations显示文摘 | Pienaar L V Shiver B D | 1984 | For Sci1984，30，： | 1 |
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