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Analysis of global and net radiation fluxes in relation to surface albedo at DACCIWA site in Ile-Ife, southwest Nigeria

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Abstract

Measurements of global solar radiation (RG) and net radiation (RN) fluxes were made above the grass-covered surface at DACCIWA site, Ile-Ife, southwest Nigeria, from 2017 to 2019. The datasets were obtained from a four-component net radiometer (model NR01, Hukseflux Thermal Sensors B.V., the Netherlands). Observations were made and separated for cases of clear sky and cloudy conditions during the measurement period. The results showed considerable fluctuations for both radiation fluxes. For clear sky conditions, the magnitudes of RG and RN were higher than those observed for cloudy conditions due to attenuation. For the period of observation, LWup fluxes were higher in the dry season than in the wet season due to dry and hotter surface conditions while LWd dominated the wet season at the site. The highest radiation values occurred in 2018, while the lowest were observed in 2017. Daily surface albedo (α) ranged from 0.16 to 0.22. Empirical relationships obtained for RG and RN are RN = 0.754 RG – 17.4 Wm−2 and RN = 0.657 RG – 32.7 Wm−2 for wet and dry seasons, respectively. Based on the empirical relationships, daily RN and RG can be obtained when measurements like these are not available. Linear relationships between RN and RG show that for all days (cloudy and clear sky conditions), daily average RN is about 0.75 RG, and about 0.60 RG for clear sky conditions at the location. However, the results reflect the characteristics of the site and can be applied for gap-filling or careful extension of the measurement period.

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Data availability

The data for this study will be made available to any individual or organization on reasonable requests via a.ajao@oauife.edu.ng or iyiolamercy2005@yahoo.com. The data were acquired at the DACCIWA site after the intensive observational studies (IOPs) had ended in 2016, but data before this period are available on SEDOO (BAOBAB) database.

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Acknowledgements

The authors are very grateful for the support received from members of the Atmospheric Physics Research Group (APRG) and technical staff at the Department of Physics and Engineering Physics, Obafemi Awolowo University, Ile-Ife, Nigeria. Partial financial support received for the DACCIWA project to upgrade the existing meteorological station in OAU came from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement number 603502. Running and maintenance of the meteorological station have been sustained in the group led by Prof. Oluwagbemiga Jegede from 2014 to date. Valuable comments received from the anonymous reviewer while reading through our manuscript are highly appreciated. Authors are also grateful to the editors for their final decision on the manuscript.

Funding

The Nigeria Micrometeorological Experiment (NIMEX) project led by Prof. Oluwagbemiga Jegede had been responsible for the running and maintenance of the Obafemi Awolowo University meteorological station (OAU Met-station) before the start of DACCIWA project in 2014. Partial financial support was received from the European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement number 603502 for the upgrade of the existing meteorological station to a supersite and reimbursements for attending conferences during the DACCIWA project.

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Authors and Affiliations

  1. Department of Physics and Engineering Physics, Obafemi Awolowo University, Ile-Ife, Nigeria

    Adewale I. Ajao & Akeem B. Agboola

  2. Center for Energy Research and Development, Obafemi Awolowo University, Ile-Ife, Nigeria

    Olawale E. Abiye

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  1. Adewale I. Ajao
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  3. Akeem B. Agboola
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Contributions

All authors contribute to the study’s conception and design. Material preparation, data collection, and analysis were performed by Dr. Adewale Iyiola Ajao. The first draft of the manuscript was written by Dr. Adewale Iyiola Ajao, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript before the final submission was made.

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Correspondence to Adewale I. Ajao.

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The manuscript is a result of the research ongoing at the Obafemi Awolowo University Ile-Ife, southwest Nigeria. The work reported here is in its original form and has not been submitted or published elsewhere. Proper acknowledgements have been given to all the works consulted in the course of its preparation.

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All authors are core members of the Atmospheric Physics Research Group (APRG) at the Department of Physics and Engineering Physics and the Center for Energy Research and Development (CERD) in Obafemi Awolowo University (OAU), Ile-Ife, southwest Nigeria. The group has been responsible for the maintenance and running of the existing meteorological station in OAU, where the data for the study was acquired. No human or animal participation was directly involved in the research.

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Ajao, A.I., Abiye, O.E. & Agboola, A.B. Analysis of global and net radiation fluxes in relation to surface albedo at DACCIWA site in Ile-Ife, southwest Nigeria. Theor Appl Climatol 152, 281–292 (2023). https://doi.org/10.1007/s00704-023-04396-2

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