Theoretical and Applied Climatology

, Volume 48, Issue 1, pp 23–27 | Cite as

Relationships of photosynthetically active radiation and shortwave irradiance

  • G. Papaioannou
  • N. Papanikolaou
  • D. Retalis


Hourly measurements of solar irradiance in the wave band excluding photosynthetically active radiation (PAR) and solar irradiance (SI) were made over a 12-month period at the National Observatory of Athens, for obtaining the ratios of PAR to SI. These irradiance ratios exhibit dependence on sky conditions, with slightly larger values being observed under “cloudy” skies and seasonal variations, attributable to changes in local air mass climatology. The highest values have been obtained during the growing season (April–September). The mean annual value of 0.473 observed for the irradiance ratio in the PAR band compares favorably with values reported in the literature for different locations over a wide geographical area.


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  1. Blackburn, W. J., Proctor, J. T. A., 1983: Estimating photosynthetically active radiation from measured solar irradiance.Solar Energy,31, 233–234.Google Scholar
  2. Britton, C. M., Dodd, J. D., 1976: Relationships of photosynthetically active radiation and shortwave irradiance.Agric. Meteorol.,17, 1–7.Google Scholar
  3. De Vault, J. E., Katsaros, K. B., 1983: Remote determination of cloud liquid water path from bandwidth — limited shortwave measurements.J. Atmos. Sci.,40, 665–685.Google Scholar
  4. Goldberg, B., Klein, W. H., 1977: Variation in the spectral distribution of daylight at various geographical locations on the earth's surface.Solar Energy,19, 3–13.Google Scholar
  5. Gueymard, C., 1989a: An atmospheric transmittance model for the calculation of the clear sky beam, diffuse and global photosynthetically active radiation.Agric. Forest Meteorol.,45, 215–229.Google Scholar
  6. Gueymard, C., 1989b: A two-band model for the calculation of clear sky solar irradiance, illuminance and photosynthetically active radiation at the earth's surface.Solar Energy,43, 253–265.Google Scholar
  7. Howell, T. A., Meek, D. W., Hatfield, J. L., 1983: Relationship of photosynthetically active radiation to shortwave radiation in the San Joaquin Valley.Agric. Meteorol.,28, 157–175.Google Scholar
  8. Karalis, J. D., 1976: The turbidity parameters in Athens.Arch. Met. Geoph. Biocl., Ser. B.,24, 25–34.Google Scholar
  9. Karalis, J. D., 1989: Characteristics of direct photosynthetically active radiation.Agric. Forest Meteorol.,48, 225–234.Google Scholar
  10. Kvifte, G., Hegg, K., Hansen, V., 1983: Spectral distribution of solar radiation in the Nordic Countries.J. Climate Appl. Meteor.,2, 143–152.Google Scholar
  11. McCree, K. J., 1966: A solarimeter for measuring photosynthetically active radiation.Agric. Meteorol.,3, 353–366.Google Scholar
  12. Monteith, J. L., 1973:Principles of Environmental Physics. London: Arnold.Google Scholar
  13. Moon, P., 1940: Proposed solar — radiation curves for engineering use.J. Franklin Inst.,230, 583–618.Google Scholar
  14. Rao, C. R., 1984: Photosynthetically active components of global solar radiation: Measurements and model computations.Arch. Met. Geoph. Biocl., Ser. B,34, 353–364.Google Scholar
  15. Rodskjer, N., 1983: Spectral daily insolation at Uppsala, Sweden.Arch. Met. Geoph. Biocl., Ser. B,33, 89–98.Google Scholar
  16. Szeicz, G., 1974: Solar radiation for plant growth.J. Appl. Ecol.,11, 617–636.Google Scholar
  17. Suckling, P. W., Davies, J. A., Proctor, J. T. A., 1975: The transmission of global and photosynthetically active radiation within a dwarf apple orchard.Can. J. Bot.,53, 1428–1441.Google Scholar
  18. Willmott, C. J., 1982: Some comments on the evaluation of model performance.Bull. Amer Meteor. Soc.,63, 1309–1313.Google Scholar
  19. Yocum, C. S., Allen, L. H., Lemon, E. R., 1969: Photosynthesis under field conditions, VI. Solar radiation balance and Photosynthesis efficiency.Agron. J.,56, 249–253.Google Scholar

Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • G. Papaioannou
    • 1
  • N. Papanikolaou
    • 2
  • D. Retalis
    • 2
  1. 1.Department of Applied Physics, Laboratory of MeteorologyUniversity of AthensAthensGreece
  2. 2.Institute of Meteorology and Physics of the Atmospheric EnvironmentNational Observatory of AthensAthensGreece

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