文档介绍：Solar aspects of papers
Global Solar Radiation Annual Profile, Causes and Seasonal Effects, at Ilorin Nigeria
+*. Babatunde, . Akoshile++, . Falaiye++, . Ajibola ++
+Covenant University, Canaan Land, Ota, Nigeria
++ Department of Physics, University of Ilorin, Ilorin, Nigeria
Abstract
The data of short-wave global (total) solar radiation of 4 years (1995-1998) at Ilorin
(8˚ 34′ N, 4˚ 34′ E), Nigeria was used to study the characteristics behavior of SW- global solar radiation in the tropics. To do this its weekly average was plotted and analyzed with respect to the atmospheric constituents responsible for the behavior. On the profile obtained, two “Wells” of unequal size and depth were identified; a “hill” and a “plateau” representing the potentials of the radiation were also identified in a 52 - week year. These features were associated with seasons of the year and the radiation potentials obtainable in the region. The size of the Wells indicates the time prevalence of the atmospheric constituents causing the Wells and the length of the respective season, while the depth indicates the amount and severity of the constituents. The “Wells” and the “Plateau” constitute 3 seasons in a 52- week year.
Keywords: solar radiation, radiation wells, radiation plateau, season.
* Corresponding Author.
Email: ebbabatunde@
Introduction
The SW-global (total) radiation, mostly between and , was the main ingredient for the study because therein contains the Photosynthetically Active Radiation (PAR) of wavelength range to , a wavelength region very important in the quantification of Primary Productivity (NPP) of Carbon dioxide () in the total budget (Daughtry et al., 1992).
Ilorin (8˚ 34′ N, 4˚ 34′ E), Nigeria, the location of this study is in the Sub-Sahel Africa. It is close to the equator; it is about 350m above sea level and situated at the upper tip of the Guinea Savannah Zone (Olaniran, 1991). Ilorin being in the tropics is annually