PAR AND IV IRRADIATIONS IN BOTUCATU/SP/BRAZIL
DOI:
https://doi.org/10.59627/cbens.2012.1916Keywords:
ultraviolet, photosynthetically active, infrared solar radiationAbstract
This work describes hourly and daily values of solar radiation components (H̅ G, H̅ UV, H̅ PAR and H̅ IR), broadband atmospheric transmissivity (K̅ t, K̅tUV, K̅tPAR and K̅ tIR) and monthly ratios UV/G, PAR /G and IR/G (K̅ UV, K̅ PAR and K̅IR) for the city of Botucatu, Brazil. The largest hourly values of solar radiation components occur in March (respectively 1.7MJ/m2, 0.073MJ/m, 0.85MJ/m2 and 0.79MJ/m2) and the smallest in July (respectively 1.37MJ/m2, 0.052MJ/m2, 0.67MJ/m2 and 0.65MJ/m2). The largest daily values of solar radiation components occur in February (respectively 21.5MJ/m2, 10.7MJ/m, 9.84MJ/m2 and 0.92MJ/m2) and the smallest in June (respectively 13.05MJ/m2, 0.504MJ/m2, 6.36MJ/m2 and 6.19MJ/m2). The broadband transmissivity is smaller in the cloudy and wet months (January) and larger in the month with large number of clear sky days (April): K̅t varies from 44.5% to 60.8%; K̅tUV from 34.8% to 42.3%, K̅tPAR from 57.7% to 74.8% and K̅tIR from 36.4% to 53.2%. The ratios K̅UV and K̅PAR are larger and K̅IR smaller during the cloudy and wet months (January). On the other hand, K̅UV and K̅PAR are smaller and the ratio K̅IR larger during the dry, cloudless and with a large aerosol load months (August): K̅UV varied from 4.6% to 3.9%, K̅PAR from 50.7% to 48.2% and K̅IR from 44.6% to 48.3%.
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References
Al-Aruri S, Rasas M, Al-Jamal K, Shaban N. An assessment of global UV solar radiation in the range (0.290-0.385 μm) in Kuwait.Solar Energy 1988;41:159-62.
Blackburn WJ, Proctor JTA. Estimating photosynthetically active radiation from measured solar irradiance. Solar Energy 1983;31:233-34.
Bolsenga SJ, Near Infrared Radiation in Northern Greenland. Journal Applied Meteorology, 1997, 6, 449-451.
Cañada J, Pedros G, Bosca JV. Relationships between UV (0.290-0.385μm) and broad band solar radiation hourly values in Valencia and Córdoba, Spain. Energy 2003; 28:199-217.
Carvalho, L. M. V.; Jones, C.; Liebmann, B.. Extreme precipitation events in sputheastern South America and large-scale convective patters in the South Atlantic Convergence Zone. Jornal of Climate, v. 15, p. 2377-2394, 2002.
Codato G, Oliveira AP, Soares J, Escobedo JF, Gomes E N, Pai AD. Global and diffuse solar irradiances in urban and rural areas in southeast of Brazil.Theoretical and Applied Climatology 2008 (in press).
Escobedo, João F.; Gomes, E. N.; Oliveira, A. P.; Soares, J. R. Ratios of UV, PAR and NIR components to global solar radiation measured at Botucatu site in Brazil. Renewable Energy, v. 36, p. 169-178, 2011.
Escobedo, J, Gomes, E, Oliveira, A, Soares, J., 2009. Modeling hourly and daily fractions of UV, PAR and NIR to global solar radiation under various sky conditions at Botucatu, Brazil. Applied Energy. , v.86, p.299 – 309.
Finch DA, Bailey WG, Mcarthur LJB, Nasitwitwi M. Photosynthetically active radiation regimes in a southern African savanna environment. Agricultural and Forest Meteorology 2004;122:229-38.
Fröhlich C, London J. Revised Instruction manual on radiation instruments and measurements. WCRP Publications series No. 7. WMO/TD No. 149, October 1986.
Huang, M., Jiang, H.; JU, W. Ultraviolet Radiation over Two Lakes in the Middle and Lower Reaches of the Yangtze River, China: An Innovative Model for UV Estimation. Terr. Atmos. Ocean. Sci., v. 22, n. 5, p. 491-506, 2011.
Jacovides CP, Tymvios FS, Assimakopoulos VD. The dependence of global and diffuse PAR radiation components on sky conditions at Athens, Greece. Agricultural and Forest Meteorology 2007;143:277-87.
Jacovides CP, Assimakopoulos VD, Tymvios FS, Asimakopoulos DN. Solar global UV (280-380nm) radiation and its relationship with solar global radiation measured on the island of Cyprus. Energy 2006;31:2728-38.
Liebmann, B.; Jones, C.; Carvalho, L. M. V. Interannual variability of daily extreme precipitation events in the state of São Paulo, Brazil. J. Climate, 14, p. 208–218, 2001.
Martinez-Lozano JA, Tena F, Utrillas MP. Ratio of UV to global broad band irradiation in Valencia, Spain.International Journal of Climatology 1999;19:903–11.
Ogunjobi KO. Ultraviolet (0.280-0.400 μm) and broadband solar hourly radiation at Kwangju, South Korea: analysis of their correlation with aerosol optical depth and clearness index. Atmospheric Research 2004;71:193-214.
Papaioannou G, Nikolidakis G, Asimakopoulos D, Retalis D. Photosynthetically active radiation in Athens. Agricultural and Forest Meteorology 1996;81:287–298.
Rao CRN. Photosynthetically active components of global solar radiation: measurements and model computations. Archives for Meteorology, Geophysics, and Bioclimatology1984;34:353-64.
Robaa SM. A study of ultraviolet solar radiation at Cairo urban area, Egypt. Solar Energy 2004;77:251-59.
Satyamurti,P e L.F.Mattos, 1989. Climatologycal lower trophosferic frontogenesis in the midlalatitudes due to horizontal deformation and divergence.Mon.Wea. Rev.,108:410-520.
Stigter, C.J.; Musabilha, M. M. The conservative ratio of photosynthetically active to total radiation in the tropics. Journal of Applied Ecology 1982;19:853-58.
Tiba, C.; Leal, N. M.; Piacentini, R. Estudo da radiação solar ultravioleta em Pernambuco. In: III Congresso Brasileiro de Energia Solar, 2010, BELÉM. III Congresso Brasileiro de Energia Solar, 2010. v. 3.
Willmott CJ. On the validation of models. Physic Geogr 198;2:184-94.
Zhang X, Zhang Y, Zhoub Y. Masuring and modellingphotosynthetically active radiation in Tibet Plateau during April-October. Agricultural Meteorology 2000;102:207-12.
