Variation Characteristics of Photosynthetically Active Radition (Par) Over Ilorin in the Tropics

Ibrahim Bolaji Balogun

Variation Characteristics of Photosynthetically Active Radition (Par) Over Ilorin in the Tropics

Banjoko I.K * §

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§ Kwara State Polytechnic, Ilorin.

Variation Characteristics of Photosynthetically Active Radition (Par) Over Ilorin in the Tropics

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Abstract

The annual variation of photosynthetically active radiation (PAR) measured over five (5) years period (2005)(2006)(2007)(2008)(2009)(2010) at Ilorin (8 0 32’N, 4 0 34’E) was studied. The average daily and weekly PAR were obtained and plotted. The behavior of average daily PAR is similar to that obtained for the weekly average. There is a daily and weekly fluctuation in PAR throughout the year. The highest value of PAR is 33.96MJ/m 2 /day which occurred during the Harmattan period and minimum during the rain period with a value of 22.816MJ/m 2 /day. The average PAR for the Harmattan and Rain period is found to be 37.585 and 29.125MJ/m 2 /day respectively, while the average annual PAR is 30.050MJ/m 2 /day. When PAR is plotted against days of the year, the plot is described by a logarithm fit as y= -1.39ln(x) + 39.91 with a weak correlation R 2 = 0.387. Also, when PAR is plotted against weeks of the year, the plot is best described by a logarithm fit as y= -1.56ln(x) + 34.74 with correlation R 2 = 0.524.

References

3 Cites in Article

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1. I Alados,Alados-Arboledas (1999). Validation of empirical Model for phosbynthetically active radiation. International Journal of Climatology, 19, 1145-1152.
2. G Asner,C Wessman (1997). Scaling PAR absorption from Leaf to landscape level in spatially heterogeneous ecosystems. Ecological Modelling, 103, 81-97.
3. D Finch,W Bailey,L Mcarthur,M Nasitwitwi (2004). Photosynthetically active radiation regimes in a southern African savanna environment. Agricultural and Forest Meteorology, 122(3-4), 229-238.

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Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

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Not applicable for this article.

How to Cite This Article

Ibrahim Bolaji Balogun. 2013. "Variation Characteristics of Photosynthetically Active Radition (Par) Over Ilorin in the Tropics". Global Journal of Science Frontier Research - A: Physics & Space Science GJSFR-A Volume 12 (GJSFR Volume 12 Issue A8).

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GJSFR Volume 12 Issue A8

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Journal Specifications

Crossref Journal DOI 10.17406/GJSFR

Print ISSN 0975-5896

e-ISSN 2249-4626

Keywords

photosynthetically active radiation pyranometer solar radiation

Classification

GJSFR-A Classification FOR Code: 850504

Submission ReceivedOctober 23, 2012
Peer Review Double Blind
Handling Editor
Accepted November 22, 2012
Published January 10, 2013

Version of record

v1.2

Issue date

January 10, 2013

Language

English

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Total Score: 107

Country: Nigeria

Subject: Global Journal of Science Frontier Research - A: Physics & Space Science

Authors: Dr. Ibrahim B.B, Usman.A (PhD/Dr. count: 1)

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