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- Title
Trends in the surface UV radiation at the Polish Polar Station, Hornsund, Svalbard (77°00′ N, 15°33′ E), based on the homogenized time series of broad-band measurements (1996-2016) and reconstructed data (1983-1995).
- Authors
Krzyścin, Janusz W.; Sobolewski, Piotr
- Abstract
Erythemal daily doses measured at the Polish Polar Station, Hornsund (77°00′ N, 15°33′ E), for the period 1996-2001 and 2005-2016 are homogenized using yearly calibration constants derived from the comparison of observed doses for cloudless conditions with the corresponding doses calculated by radiative transfer (RT) simulations. Modeled all-sky doses are calculated by the multiplication of cloudless RT doses by the empirical cloud modification factor dependent on the daily sunshine duration. An all-sky model is built using daily erythemal doses measured in the period 2005-2006-2007. The model is verified by comparisons with the 1996-1997-1998 and 2009-2010-2011 measured data. The daily doses since 1983 (beginning of the proxy data) are reconstructed using the all-sky model with the historical data of the column ozone from the satellite measurements (SBUV merged ozone data set), the snow depth (for ground albedo estimation), and the observed daily sunshine duration at the site. Trend analyses of the monthly and yearly time series comprising of the reconstructed and observed doses reveal statistically significant trend only in March (∼ 1 %/yr) in the period 1983-2016. The trends based on the observed data only (1996-2001 and 2005-2016) show declining tendencies during spring (March-April-May) of ∼ 1 %/yr. An analysis of sources of the yearly dose variability since 1983 provides that cloud cover changes are a basic driver of the long-term UV changes at the location.
- Subjects
ULTRAVIOLET radiation; COMPUTER simulation of radiative transfer; WEATHER control; SUNSHINE; SNOW accumulation
- Publication
Atmospheric Chemistry & Physics Discussions, 2017, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2017-619