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Volume 18, issue 3
Atmos. Chem. Phys., 18, 1805-1818, 2018
https://doi.org/10.5194/acp-18-1805-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Quadrennial Ozone Symposium 2016 – Status and trends...

Atmos. Chem. Phys., 18, 1805-1818, 2018
https://doi.org/10.5194/acp-18-1805-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 07 Feb 2018

Research article | 07 Feb 2018

Reconstruction and analysis of erythemal UV radiation time series from Hradec Králové (Czech Republic) over the past 50 years

Klára Čížková1,2, Kamil Láska1, Ladislav Metelka2, and Martin Staněk2 Klára Čížková et al.
  • 1Department of Geography, Faculty of Science, Masaryk University, Brno, 611 37, Czech Republic
  • 2Solar and Ozone Observatory, Czech Hydrometeorological Institute, Hradec Králové, 500 08, Czech Republic

Abstract. This paper evaluates the variability of erythemal ultraviolet (EUV) radiation from Hradec Králové (Czech Republic) in the period 1964–2013. The EUV radiation time series was reconstructed using a radiative transfer model and additional empirical relationships, with the final root mean square error of 9.9%. The reconstructed time series documented the increase in EUV radiation doses in the 1980s and the 1990s (up to 15% per decade), which was linked to the steep decline in total ozone (10% per decade). The changes in cloud cover were the major factor affecting the EUV radiation doses especially in the 1960s, 1970s, and at the beginning of the new millennium. The mean annual EUV radiation doses in the decade 2004–2013 declined by 5%. The factors affecting the EUV radiation doses differed also according to the chosen integration period (daily, monthly, and annually): solar zenith angle was the most important for daily doses, cloud cover, and surface UV albedo for their monthly means, and the annual means of EUV radiation doses were most influenced by total ozone column. The number of days with very high EUV radiation doses increased by 22% per decade, the increase was statistically significant in all seasons except autumn. The occurrence of the days with very high EUV doses was influenced mostly by low total ozone column (82% of days), clear-sky or partly cloudy conditions (74% of days) and by increased surface albedo (19% of days). The principal component analysis documented that the occurrence of days with very high EUV radiation doses was much affected by the positive phase of North Atlantic Oscillation with an Azores High promontory reaching over central Europe. In the stratosphere, a strong Arctic circumpolar vortex and the meridional inflow of ozone-poor air from the southwest were favorable for the occurrence of days with very high EUV radiation doses. This is the first analysis of the relationship between the high EUV radiation doses and macroscale circulation patterns, and therefore more attention should be given also to other dynamical variables that may affect the solar UV radiation on the Earth surface.

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In order to broaden the knowledge of long-term UV radiation variability, we have reconstructed and analyzed a 50-year-long UV radiation time series from Hradec Králové, Czech Republic. The UV radiation intensities increased greatly following the decline of ozone amounts in the 1980s and 1990s. High UV radiation doses were observed in days with low ozone amounts, clear or partly cloudy skies, or snow cover.
In order to broaden the knowledge of long-term UV radiation variability, we have reconstructed...
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