Comparative study on different models for estimation of direct normal irradiance (DNI) over Egypt atmosphere

Madkour, M.A.; El‐Metwally, Mossad; Hamed, A.B.

doi:10.1016/j.renene.2005.03.009

Cited by 46 publications

(16 citation statements)

References 17 publications

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“…The spectral radiative transmittance factors used to compute the broadband transmittance functions, come from Yang et al [8] based on the Leckner's spectral model [45]. The performance of this model was tested and verified in several studies [46][47][48][49]. For all sky conditions, the influence of clouds is taken into account by adapting the broadband transmittance function according to the parameterization described in Stephens et al [50], also applied and validated in Van Laake et al [1].…”

Section: Instantaneous Solar Radiationmentioning

confidence: 99%

Estimation of Daily Solar Radiation Budget at Kilometer Resolution over the Tibetan Plateau by Integrating MODIS Data Products and a DEM

Roupioz

Nerry

et al. 2016

Remote Sensing

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Considering large and complex areas like the Tibetan Plateau, an analysis of the spatial distribution of the solar radiative budget over time not only requires the use of satellite remote sensing data, but also of an algorithm that accounts for strong variations of topography. Therefore, this research aims at developing a method to produce time series of solar radiative fluxes at high temporal and spatial resolution based on observed surface and atmosphere properties and topography. The objective is to account for the heterogeneity of the land surface using multiple land surface and atmospheric MODIS data products combined with a digital elevation model to produce estimations daily at the kilometric level. The developed approach led to the production of a three-year time series (2008)(2009)(2010) of daily solar radiation budget at one kilometer spatial resolution across the Tibetan Plateau. The validation showed that the main improvement from the proposed method is a higher spatial and temporal resolution as compared to existing products. However, even if the solar radiation estimates are satisfying on clear sky conditions, the algorithm is less reliable under cloudy sky condition and the albedo product used here has a too coarse temporal resolution and is not accurate enough over rugged terrain.

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Section: Instantaneous Solar Radiationmentioning

confidence: 99%

Estimation of Daily Solar Radiation Budget at Kilometer Resolution over the Tibetan Plateau by Integrating MODIS Data Products and a DEM

Roupioz

Nerry

et al. 2016

Remote Sensing

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“…The hybrid model was recognized by many researchers (Gueymard, 2003a, b;Paulescu and Schlett, 2004;Madkour et al, 2006) as one of the best broadband models. It has been also applied to provide solar radiation input data for hydrological modeling in Tang et al (2007Tang et al ( , 2008.…”

Section: Hybrid Modelmentioning

confidence: 99%

Solar radiation trend across China in recent decades: a revisit with quality-controlled data

et al. 2011

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Abstract. Solar radiation is one of the most important factors affecting climate and environment, and its long-term variation is of much concern in climate change studies. In the light of the limited number of radiation stations with reliable longterm time series observations, this paper presents a new evaluation of the long-term variation of surface solar radiation over China by combining quality-controlled observed data and two radiation models. One is the ANN-based (Artificial Neutral Network) model and the other is a physical model. The two models produce radiation trends comparable to the observed ones at a few validation stations possessing reliable and continuous data. Then, the trend estimate is extended by the ANN-based model to all 96 radiation stations and furthermore extended by the physical model to all 716 China Meteorological Administration (CMA) routine stations. The new trend estimate is different from previous ones in two aspects. First, the magnitude of solar radiation over China decreased by about −0.23 W m −2 yr −1 between 1961 and 2000, which is greatly less in magnitude than trend slopes estimated in previous studies (ranging over −0.41 ∼ −0.52 W m −2 yr −1 ). Second, the "From Dimming to Brightening" transition in China during the late 1980s ∼ the early 1990s was addressed in previous studies, but this study indicates the solar radiation reached a stable level since the 1990s and the transition is not noticeable. These differences indicate the importance of data-quality control and analysis approaches. Finally, an obvious transition from brightening to dimming around 1978 is found over the Tibetan Plateau, where aerosol loads are very low, indicating that the importance of cloud changes in altering solar radiation may be comparable to that of the aerosol changes.

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“…This study uses the broadband model of Yang et al [32] to compute the broadband transmittance functions by spectral radiative transmittance factors for cloud-free conditions. Performance of this model has been accurately evaluated in several studies [37][38][39]. The direct beam irradiance (I b ), diffuse irradiance (I d ) that is expressed as the difference between the direct irradiance and a fictitious beam subject only to molecular absorption, and then global irradiance (I g ) can be calculated using the broadband transmittance functions as follows:…”

Section: Modis Data and Study Daysmentioning

confidence: 99%

Estimation of High-Resolution Surface Shortwave Radiative Fluxes Using SARA AOD over the Southern Great Plains

2017

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Atmospheric aerosol optical depth (AOD) plays a determinant role in estimations of surface shortwave (SW) radiative fluxes. Therefore, this study aims to develop a hybrid scheme to produce surface SW fluxes, based on AOD at 1-km spatial resolution retrieved from the Simplified Aerosol Retrieval Algorithm (SARA) and several Terra MODIS land and atmospheric products (i.e., geolocation properties, water vapor amount, total ozone column, surface reflectance, and top-of-atmosphere (TOA) radiance). Estimations based on SARA were made over the Southern Great Plains (SGP) under cloud-free conditions in 2014 and compared with estimations based on the latest Terra MODIS AOD product at 3-km resolution. Validation against ground-based measurements showed that SARA-based fluxes obtain lower RMSE and bias values compared with MODIS-based estimations. MODIS-based downward and net fluxes are satisfactory, while the direct and diffuse components are less reliable. The results demonstrate that the SARA-based scheme produces better surface SW radiative fluxes than the MODIS-based estimates provided in this and other similar studies and that these fluxes are comparable to existing CERES data products which have been tested over the SGP.

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Comparative study on different models for estimation of direct normal irradiance (DNI) over Egypt atmosphere

Cited by 46 publications

References 17 publications

Estimation of Daily Solar Radiation Budget at Kilometer Resolution over the Tibetan Plateau by Integrating MODIS Data Products and a DEM

Estimation of Daily Solar Radiation Budget at Kilometer Resolution over the Tibetan Plateau by Integrating MODIS Data Products and a DEM

Solar radiation trend across China in recent decades: a revisit with quality-controlled data

Estimation of High-Resolution Surface Shortwave Radiative Fluxes Using SARA AOD over the Southern Great Plains

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