Preprints
https://doi.org/10.5194/egusphere-2022-688
https://doi.org/10.5194/egusphere-2022-688
 
07 Sep 2022
07 Sep 2022
Status: this preprint is open for discussion.

Assessment of spectral UV radiation at Marambio Base, Antarctic Peninsula

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 study aims to assess response of spectral UV radiation to different atmospheric and terrestrial factors, including solar zenith angle, ozone, cloud cover and albedo, in southern polar environment. For this purpose, 23260 individual spectra (300–363 nm), obtained by the B199 Mk-III Brewer spectrophotometer at Marambio Base, Antarctic Peninsula Region, over the period 2010–2020, were studied. A neural network model was developed to investigate the effects of the explanatory variables at individual wavelengths. SZA proved to be the most important parameter, followed by cloud cover, TOC, and surface albedo. The relative SZA effect is greatest at the shortest wavelengths, where a 1° decline in SZA results in a 6–18 % increase in UV irradiance (305 nm). Also TOC affects particularly the short wavelengths, while at 305 nm, a 10 DU decrease in TOC causes a 7–13 % increase in UV irradiance. In some seasons (e.g., 2011–2012, 2014–2015, 2018–2019), the large-scale ozone holes caused the UV irradiance at very short wavelengths peak in spring, whereas in other seasons (e.g., 2010–2011, 2012–2013), the maxima at all wavelengths were recorded in summer. The effect of cloud cover was strongest near the fully cloudy sky, and in summer months. Albedo affected the UV irradiance only weakly, its effect was strongest in early spring and late fall.

Klára Čížková et al.

Status: open (until 19 Oct 2022)

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Klára Čížková et al.

Klára Čížková et al.

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Short summary
The study deals with ultraviolet radiation in southern polar conditions, where ozone depletion occurs each spring. For the first time in the region, a ten years long time series UV spectra from Marambio Base, Antarctic Peninsula, has been studied, with a focus on the changes of UV radiation at different wavelengths and the effects of atmospheric and terrestrial variables. At the very short wavelengths, the effect of ozone and its deficiency was clearly observed.