Thermal properties of an agricultural site in Ile-Ife, Nigeria

Oladosu, OR; Jegede, OO

doi:10.4314/njpap.v4i1.21470

Cited by 1 publication

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“…The MAR had the highest r 2 and least error values. The QE estimated by MAR models were about 5 Wm -2 higher than the one estimated by Oladosu and Jegede (2005) using Bowen ratio method. Also, the relatively good agreement between QE estimated by corrected resistance equation was consistent with previous results reported by Balogunet al (2004), who found agreement between instantaneous QE determined by Bowen ratio system and QE estimated by eddy correlation system.…”

Section: Diurnal Casesmentioning

confidence: 61%

“…The turbulent heat fluxes are the major components of the energy balance and these surface heat fluxes are very essential in estimation of evapotranspiration and monitoring surface energy budget. In West Africa, several studies have explored several profile parameterization methodologies to estimate these heat fluxes using the measured data (Mauder et al, 2007;Oladosu and Jegede, 2005;Ayoola et al, 2006;Balogun et al, 2004;Akinnubi and Adeniyi, 2010; Adeniyi and Otunla, 2010) but these methodologies do not tacitly consider the aspect of aerodynamic surface layer resistance, radiometric surface temperature and excess resistance in the estimation of above mentioned heat fluxes. Empirical models like Bowen Ratio method, Modified Bowen Ratio method and Flux-variance model have been used and validated, but they cannot be incorporated into the Climate models because some of the input climate variables are not routinely available in some meteorological stations.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical Modeling of Diurnal Patterns of Turbulent Heat Fluxes using Modified Aerodynamic Resistance Method

Akinnubi¹,

Oketayo

Akinwale³

et al. 2018

AJAS

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The development of improved methods for estimating turbulent heat fluxes is important in effective monitoring of the surface energy balance for climate change prediction. However, different Â parameterized models carried out at the local site of Nigerian Micrometeorological site (NIMEX-1) did not consider the surface heat fluxes-aerodynamics resistance relationships, and these validated models cannot be incorporated into the Climate models because some of the input climate variables are not routinely available in some meteorological stations. This study therefore, aims at improving the diurnal patterns of surface heat fluxes estimates using radiometric surface temperature and aerodynamic surface-layer resistances. Hourly data of air temperature (Ta), soil temperature (Tsoil), global radiation (QL), surface temperature (Ts), wind speed (u), QH and QE were obtained from the NIMEX-1 at Ile-Ife (7.55 oN, 4.55 oE). The QH and QE were estimated using Aerodynamic Resistance Approach algorithm which was modified to reduce the large bias errors between the aerodynamic temperature and surface temperature above the ground level. The algorithms were validated and rated using the following error statistics: coefficient of determination (r2), Mean Bias Error (MBE) and Root Mean Square Error (RMSE). The RMSE and MBE for the modeled QE estimated using ARM and MAR reduced from 28.33Wm-2 to 14.33 Wm-2 and 36.93 to 10.74 Wm-2 respectively while for QH ,the RMSE and MBE reduced from 17.29 Wm-2 to 9.49 Wm-2 and 31.39 to 16.93 Wm-2 respectively. The r2 values ranged from 0.68 to 0.73 and 0.95 to 0.98 for QH and QE respectively. The MAR had the highest r2 and least error values.Â Hence, the proposed modified Aerodynamic resistance models are estimated the diurnal and seasonal turbulent heat fluxes accurately for tropical regions.

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Section: Diurnal Casesmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%