Long‐term erythemal UV doses at Sodankylä estimated using total ozone, sunshine duration, and snow depth

Lindfors, Anders V.; Arola, Antti; Kaurola, Jussi; Taalas, P.; Svenøe, T.

doi:10.1029/2002jd003325

Cited by 45 publications

(70 citation statements)

References 32 publications

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“…However, our model provides RMS error ∼ 15 % for estimates of the daily erythemal dose. Lindfors et al (2003) found RMS error of ∼ 23 %. To determine how model (2) uncertainty influences trend estimates for the whole period 1983-2016, we propose a Monte Carlo methodology to derive the trend value and its uncertainty based on a hypothetical bootstrap sample (N = 10 000) of the linear trend coefficients and their errors (see Sect.…”

Section: Data Reconstructionmentioning

confidence: 99%

See 1 more Smart Citation

Trends in erythemal doses at the Polish Polar Station, Hornsund, Svalbard based on the homogenized measurements (1996–2016) and reconstructed data (1983–1995)

Krzyścin

Sobolewski

2018

Atmos. Chem. Phys.

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Abstract. Erythemal daily doses measured at the Polish Polar Station, Hornsund (77 • 00 N, 15 • 33 E), for the periods 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 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 comprised of the reconstructed and observed doses do not reveal a statistically significant trend in the period 1983-2016. The trends based on the observed data only (1996-2001 and 2005-2016) show declining tendency (about −1 % per year) in the monthly mean of daily erythemal doses in May and June, and in the yearly sum of daily erythemal doses. An analysis of sources of the yearly dose variability since 1983 shows that cloud cover changes are a basic driver of the long-term UV changes at the site.

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Section: Data Reconstructionmentioning

confidence: 99%

“…Table 1 shows the monthly bias and RMS errors of the model (3) performance for March-September in the period 2005-2016. The model setup is similar to that used by Lindfors et al (2003) for UV daily-dose reconstruction for Sodankylä. However, our model provides RMS error ∼ 15 % for estimates of the daily erythemal dose.…”

Section: Data Reconstructionmentioning

confidence: 99%

Trends in erythemal doses at the Polish Polar Station, Hornsund, Svalbard based on the homogenized measurements (1996–2016) and reconstructed data (1983–1995)

Krzyścin

Sobolewski

2018

Atmos. Chem. Phys.

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“…Lindfors et al, 2003;Den Outer et al, 2005;Lindfors and Vuilleumier, 2005;Reuder and Koepke, 2005). To the knowledge of the authors no study on the reconstruction of UV levels in a high alpine region above 3000 m has been performed.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of erythemal UV-doses for two stations in Austria: a comparison between alpine and urban regions

et al. 2008

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Abstract. The aim of this study is the reconstruction of past UV-doses for two stations in Austria, Hoher Sonnblick and Vienna, using a physical radiation transfer model. The method uses the modeled UV-dose under clear-sky conditions, cloud modification factors and a correction factor as input variables. To identify the influence of temporal resolution of input data and modification factors, an ensemble of four different modelling approaches was calculated, each with hourly or daily resolution. This is especially important because we found no other study describing the influence of the temporal resolution of input data on model performance. Following the results of the statistical analysis of the evaluation period the model with the highest temporal resolution (HMC) was chosen for the reconstruction of UV-doses. A good agreement between modelled and measured values of erythemally effective UV-doses was found at both stations. In relation to the reference period 1976-1985 an increase in the erythemal UV-dose in Vienna of 11% is visible in the period 1986-1995 and an increase of 17% in the period 1996-2005 can be seen. At Hoher Sonnblick the corresponding increase is 2% and 9%. For the different seasons the strongest increase in erythemal UV-dose has been found for winter and spring season at both stations. Further the influences of total ozone and cloudiness on changes in erythemal UV-doses were analyzed. This analysis showed for both stations, that changes in total ozone had a larger influence on erythemal UV-doses than changes in cloudiness.

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“…In addition, we used ancillary data including global radiation (300-3000 nm) measured with a Kipp and Zonen CM11 pyranometer, sunshine duration measured with an electronic sunshine recorder (Lindfors et al, 2003) and SYNOP cloud amount. Figure 1 shows MODIS derived AOD values at 0.55 µm during a four-week-period for Tõravere as well as for Helsinki and Jokioinen in Finland.…”

Section: Surface Observations At Jokioinenmentioning

confidence: 99%

A case study on biomass burning aerosols: effects on aerosol optical properties and surface radiation levels

et al. 2007

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Abstract. In spring 2006, biomass burning aerosols from eastern Europe were transported extensively to Finland, and to other parts of northern Europe. They were observed as far as in the European Arctic. In the first part of this paper, temporal and spatial evolution and transport of these biomass burning aerosols are monitored with MODIS retrieved aerosol optical depth (AOD) imagery at visible wavelengths (0.55 µm). Comparison of MODIS and AERONET AOD is conducted at Tõravere, Estonia. Then trajectory analyses, as well as MODIS Fire Mapper products are used to better understand the type and origin of the air masses. During the studied four-week period AOD values ranged from near zero up to 1.2 at 0.55 µm and the linear correlation between MODIS and AERONET was very high (∼0.97). Temporal variability observed within this fourweek period was also rather well explained by the trajectory analysis in conjunction with the fire detections produced by the MODIS Rapid Response System. In the second part of our study, the surface measurements of global and UV radiation at Jokioinen, Finland are used to study the effect of this haze episode on the levels of surface radiation. We found reductions up to 35% in noon-time surface UV irradiance (at 340 nm) as compared to typical aerosol conditions. For global (total solar) radiation, the reduction was always smaller, in line with the expected wavelength dependence of the aerosol effect.

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Long‐term erythemal UV doses at Sodankylä estimated using total ozone, sunshine duration, and snow depth

Cited by 45 publications

References 32 publications

Trends in erythemal doses at the Polish Polar Station, Hornsund, Svalbard based on the homogenized measurements (1996–2016) and reconstructed data (1983–1995)

Trends in erythemal doses at the Polish Polar Station, Hornsund, Svalbard based on the homogenized measurements (1996–2016) and reconstructed data (1983–1995)

Reconstruction of erythemal UV-doses for two stations in Austria: a comparison between alpine and urban regions

A case study on biomass burning aerosols: effects on aerosol optical properties and surface radiation levels

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