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Ann. Geophys., 20, 559-564, 2002
www.ann-geophys.net/20/559/2002/
© European Geosciences Union 2002
Surface ultraviolet radiation over east Siberia: seasonal variations
A. V. Mikhalev, M. A. Chernigovskaya, A. Yu. Shalin, and E. S. Kazimirovsky
Institute of Solar-Terrestrial Physics SD RAS, P.O. Box 4026, Irkutsk, 664033, Russia
Correspondence to: A. V. Mikhalev (mikhalev@iszf.irk.ru)
Abstract. The results of spectral
measurements of the daily near-noon surface direct solar ultraviolet radiation
in the wavelength range of 295–345 nm obtained in Irkutsk (East Siberia) for
the time interval of 1998–2000 are presented. For the period under
consideration, the seasonal UV radiation variations are analysed that are
associated with the total ozone dynamics, the transition of cyclonic and
anticyclonic (Siberian anticyclone) periods, the presence of snow cover, and
other factors. The analysis reveals an asymmetric behaviour of the seasonal
course in ground-level UV radiation around the time of the summer solstice,
with seasonal variation dependence on the wavelength. We have determined the
irregular variations of surface UV radiation that is typical for the region,
with their properties dependent on the season and on the spectral range
analysed. The similarity of the above noted features from year to year was
revealed.
Key words. Atmospheric composition
and structure (Transmission and scattering of radiation; instruments and
techniques) – Meteorology and atmospheric dynamics (middle atmosphere
dynamics)
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