Estimates and Measurements of Photosynthetically Active Radiation and Global Solar Irradiance in Rondonia
- Department of Agricultural Engineering, Federal University of Vicosa, CEP 36570000, Vicosa-MG (Brazil)
- Department of Ambiental Engineering, Federal University of Rondonia, CEP 78960000, Ji-Parana-RO (Brazil)
Measurements of photosynthetically active radiation (PAR) and global solar irradiance (R{sub s}) were made at a LBA (The Large Scale Biosphere-Atmosphere Experiment in Amazonia) experimental site, at Fazenda Nossa Senhora (10 deg. 45' S; 62 deg. 21' W), in Rondonia, in the years of 2004 and 2005, with the objective of estimating the seasonal variation of the ratio between the photosynthetically active radiation and the global solar irradiance. The relationship between PAR and R{sub s} were made by using linear regressions equations with data from year 2004 and tested with data from the year 2005. The seasonal variation of the ratio PAR/R{sub s} ranged from 0.43 (September) to 0.48 (January). The linear regression equations between PAR and R{sub s} obtained were: a) On an hourly basis: PAR 0.747+0.478*R{sub s},(R{sup 2} = 0.99; wet season) and PAR = -4.578+0.452*R{sub s}(R{sup 2} 0.99; dry season); b) On a daily basis: PAR = 4.956+0.466*R{sub s}(R{sup 2} = 0.99; wet season) and PAR = -6.762+0.457*R{sub s}(R{sup 2} = 0.96; dry season)
- OSTI ID:
- 21293345
- Journal Information:
- AIP Conference Proceedings, Vol. 1100, Issue 1; Conference: IRS 2008: Current problems in atmospheric radiation: International radiation symposium (IRC/IAMAS), Foz do Iguacu (Brazil), 3-8 Aug 2008; Other Information: DOI: 10.1063/1.3117013; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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