2 November 1993 Effects of arctic ozone depletions in 1992 and 1993 on UV exposure in Finland
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Proceedings Volume 2049, Atmospheric Radiation; (1993) https://doi.org/10.1117/12.163513
Event: High Latitude Optics, 1993, Tromso, Norway
Abstract
Exceptionally low total ozone up to 40% below the normal level has been measured over Northern Europe during winter and spring in 1992 and 1993. The increase in the UV exposure of the Finnish population associated with the combined effects of ozone depletion and snow reflection was examined in this study with the aid of broadband measurements and theoretical calculations. The theoretical calculations were verified with spectral and broadband measurements. The calculations show that the annual horizontal doses in Helsinki (60.2 degree(s)N, 25 degree(s)E) are about 30% higher than in Saariselka (68.4 degree(s)N, 27.5 degree(s)E), but the difference is only 12% for vertical doses owing to the stronger contribution to vertical (facial) surfaces of the reflection of UV from snow. In Saariselka, the maximum vertical irradiance at the end of April approaches the midsummer values. The ozone depletions had no significant effect on the biologically effective UV in 1992 since the total ozone returned to normal at the end of March before the UV increased to biologically significant level. In contrast, in 1993 low ozone levels were measured still at least up to mid May resulting in an average theoretical increase of 8% during a period from 14 April until 22 May in biologically effective UV.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kari Jokela, Kari Jokela, Kirsti Leszczynski, Kirsti Leszczynski, Reijo Visuri, Reijo Visuri, Tapani Koskela, Tapani Koskela, } "Effects of arctic ozone depletions in 1992 and 1993 on UV exposure in Finland", Proc. SPIE 2049, Atmospheric Radiation, (2 November 1993); doi: 10.1117/12.163513; https://doi.org/10.1117/12.163513
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