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Proceedings Paper

Effects of arctic ozone depletions in 1992 and 1993 on UV exposure in Finland
Author(s): Kari Jokela; Kirsti Leszczynski; Reijo Visuri; Tapani Koskela
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Paper 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.

Paper Details

Date Published: 2 November 1993
PDF: 10 pages
Proc. SPIE 2049, Atmospheric Radiation, (2 November 1993); doi: 10.1117/12.163513
Show Author Affiliations
Kari Jokela, Finnish Ctr. for Radiation and Nuclear Safety (Finland)
Kirsti Leszczynski, Finnish Ctr. for Radiation and Nuclear Safety (Finland)
Reijo Visuri, Finnish Ctr. for Radiation and Nuclear Safety (Finland)
Tapani Koskela, Finnish Meteorological Institute (Finland)

Published in SPIE Proceedings Vol. 2049:
Atmospheric Radiation
Knut H. Stamnes, Editor(s)

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