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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 9
Ann. Geophys., 17, 1199–1209, 1999
https://doi.org/10.1007/s00585-999-1199-6
© European Geosciences Union 1999
Ann. Geophys., 17, 1199–1209, 1999
https://doi.org/10.1007/s00585-999-1199-6
© European Geosciences Union 1999

  30 Sep 1999

30 Sep 1999

Late spring ultraviolet levels over the United Kingdom and the link to ozone

J. Austin1, C. M. H. Driscoll2, S. F. G. Farmer1, and M. J. Molyneux1 J. Austin et al.
  • 1Meteorological Office, London Road, Bracknell, Berkshire, RG12 2SZ, UK
  • 2National Radiological Protection Board, Didcot, Chilton, Oxfordshire, OX11 0RQ, UK

Abstract. Erythemally-weighted ultraviolet (UVery) levels measured over southern England, during anticyclonic weather between 30 April and 2 May, 1997, were almost 50 higher than normally expected for clear skies and were similar to mid-summer values for the first time since measurements began in 1990. Investigation of this episode suggests that a combination of both meteorological and chemical effects were responsible for generating record low ozone amounts for the time of year. Further, comparisons between the A band ultraviolet (315 to 400 nm wavelength) amounts, and radiative calculations confirm that the high UVery was primarily due to the reduction in total ozone. These results are contrasted with a similar period for 1998, in which near climatological ozone amounts were measured. The prospects for enhanced UVery levels in future years are briefly reviewed in the light of expected increases in stratospheric halogen levels and greenhouse gases.

Key words. Atmospheric composition and structure (middle atmosphere · composition and chemistry) · Meterology and atmospheric dynamics (middle atmosphere dynamics; radiative processes)

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