Abstract
Daily and weekly fluctuations of PAR, UV-A, and UV-B have been continuously monitored for 5 months in Ancient Korinthos, Greece (37°58′ N, 23°0′ E) using a calibrated instrument based on 3 sharp band sensors. Daily dose ranged between 521–12 006 kJ u-2 for PAR; 52–1, 239 kJ m-2 for UV-A; and 0.66–22.5 kJ m2 for UV-B. Weekly dose ranged between 16 778–81 788 kJ m-2 for PAR; 1 406–8 517 kJ m-2 for UV-A; and 18–151 kJ m-2 for UV-B. UV-B/PAR and UV-A/PAR ratio distribution, however, does not follow closely PAR fluctuations. Generally, the UV-B/PAR and UV-A/PAR ratios were high in bright light conditions (2.1× 10-3, 118×10-3) and low in darker weeks (0.9 × 10-3, 63 × 10-3). The UV-B/UV-A ratio exhibits smaller fluctuations with season (20x1 × 10-3, 12 × 10-3). Attention is drawn to the effects of sudden changes in ambient radiation and to the ratios of UV-B, UV-A, and PAR.
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Santas, R., Koussoulaki, A., Häder, DP. (1997). In assessing biological UV-B effects, natural fluctuations of solar radiation should be taken into account. In: Rozema, J., Gieskes, W.W.C., Van De Geijn, S.C., Nolan, C., De Boois, H. (eds) UV-B and Biosphere. Advances in vegetation science, vol 17. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5718-6_8
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DOI: https://doi.org/10.1007/978-94-011-5718-6_8
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