Modeling the spatial distribution of Global Solar Radiation (GSR) over Ghana using the Angström-Prescott ˚ sunshine duration model
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Date
2019-05-21
Journal Title
Journal ISSN
Volume Title
Publisher
Scientific African
Abstract
Solar radiation is an important geological and meteorological parameter. In most developing countries, data is readily unavailable owing to lack of instrumentation and skilled
personnel. In this study, Global solar radiation (GSR) over Ghana has been quantified using the Angström–Prescott ˚ sunshine model with sunshine duration data from 22 synoptic
stations distributed across the country’s ecological zones. The simulated data was gridded
at 10 km by 10 km, establishing the spatial distribution of solar radiation over the country.
Comparison with satellite data showed good results with root mean square error (RMSE)
values of 1–5 MJm−2day−1 and correlation coefficient of 60 - 66%. Meanwhile, the estimated total GSR over the country was found to be 412.82 MJm−2day−1. The savanna zone
had the maximum estimated total monthly mean GSR for the year, with the highest value
of 20.76 MJm−2day−1 in Navrongo. The forest zone had the minimum estimated total annual mean GSR, with the lowest radiation level in Oda (17.11 MJm−2day−1). A maximum
and minimum mean clearness index of 0.59 and 0.48 respectively are estimated, implying
that about 53% of solar radiation at the top of the atmosphere reaches the study area after
attenuation. The satellite data has a total monthly mean horizontal Global Solar irradiance
of 366.62 MJm−2day−1. The study shows that the region is a potential field to harness and
optimize solar energy for the operation of photovoltaic systems and solar collectors for
industrial and domestic applications.
Description
An article published by Scientific African
Keywords
Angström–prescott, Sunshine duration model, Global solar radiation, Gridding
Citation
Scientific African 4 (2019) e00094