Long‐term variations of UV‐B irradiance over Canada estimated from Brewer observations and derived from ozone and pyranometer measurements

Fioletov, Vitali; McArthur, L. J. B.; Kerr, J. B.; Wardle, D. I.

doi:10.1029/2001jd000367

Cited by 114 publications

(119 citation statements)

References 31 publications

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“…Here we use the ozone data from the Dobson spectrophotometer measurements at Hradec Kralove (1964Kralove ( -2001, Belsk (1966Belsk ( -2001, and the filter ozonometer M-124 and Dobson measurements at St. Petersburg (1973-2001, the nearest station to Tõravere providing the total ozone data. The total ozone time series for Hradec Kralove and Belsk are longer but the length of the analyzed series was limited by the onset of the ancillary data.…”

Section: The Data Usedmentioning

confidence: 99%

“…Recently, various models using variables directly affecting the UV radiation (total ozone, cloud/aerosol optical depth) and proxies parameterizing the UV transmittance through the atmosphere (total solar radiation, sunshine duration, and cloud cover) have been used to reconstruct surface UV radiation (e.g. Ito et al, 1993;den Outer et al, 2000;Fioletov et al, 2001;de La Casinière et al, 2002). The pyranometer and other meteorological data serve as proxies for the combined cloud/aerosols effects on UV radiation.…”

Section: Introductionmentioning

confidence: 99%

“…The pyranometer and other meteorological data serve as proxies for the combined cloud/aerosols effects on UV radiation. The reconstructed data sets, which can extend backward in time to the beginning of total ozone and pyranometer or cloud observations, would help to examine the climatology and the long-term variations and trends of UV radiation (Kaurola et al, 2000;Fioletov et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The daily doses of the erythemally weighted UV radiation are reconstructed for three sites in Central Europe: Belsk-Poland (1966-2001, Hradec Kralove-Czech Republic (1964-2001, and Tõravere-Estonia (1967-2001 to discuss the UV climatology and the long-term changes of the UV-B radiation since the mid 1960s. Various reconstruction models are examined: a purely statistical model based on the Multivariate Adaptive Regression Splines (MARS) methodology, and a hybrid model combining radiative transfer model calculations with empirical estimates of the cloud effects on the UV radiation.…”

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confidence: 99%

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Long-term variations of the UV-B radiation over Central Europe as derived from the reconstructed UV time series

2004

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Abstract. The daily doses of the erythemally weighted UV radiation are reconstructed for three sites in Central Europe: Belsk-Poland (1966-2001, Hradec Kralove-Czech Republic (1964-2001, and Tõravere-Estonia (1967-2001 to discuss the UV climatology and the long-term changes of the UV-B radiation since the mid 1960s. Various reconstruction models are examined: a purely statistical model based on the Multivariate Adaptive Regression Splines (MARS) methodology, and a hybrid model combining radiative transfer model calculations with empirical estimates of the cloud effects on the UV radiation. Modeled long-term variations of the surface UV doses appear to be in a reasonable agreement with the observed ones. A simple quality control procedure is proposed to check the homogeneity of the biometer and pyranometer data. The models are verified using the results of UV observations carried out at Belsk since 1976. MARS provides the best estimates of the UV doses, giving a mean difference between the modeled and observed monthly means equal to 0.6±2.5%. The basic findings are: similar climatological forcing by clouds for all considered stations (∼30% reduction in the surface UV), long-term variations in UV monthly doses having the same temporal pattern for all stations with extreme low monthly values (∼5% below overall mean level) at the end of the 1970s and extreme high monthly values (∼5% above overall mean level) in the mid 1990s, regional peculiarities in the cloud long-term forcing sometimes leading to extended periods with elevated UV doses, recent stabilization of the ozone induced UV long-term changes being a response to a trendless tendency of total ozone since the mid 1990s. In the case of the slowdown of the total ozone trend over Northern Hemisphere mid-latitudes it seems that clouds will appear as the most important modulator of the UV radiation both in long-and short-time scales over next decades.

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Section: The Data Usedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Long-term variations of the UV-B radiation over Central Europe as derived from the reconstructed UV time series

2004

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“…[3] Long-term variability of UV radiation has been extensively analyzed during the last few years from satellite and ground based measurements at several locations worldwide [Fioletov et al, 2001;Frederick et al, 2001;Den Outer et al, 2005]. The statistical significance of the longterm UV variability is of the order of a few percent per decade, depending on location, wavelength range, and duration of period analyzed.…”

Section: Introductionmentioning

confidence: 99%

Total ozone and solar erythemal irradiance in southwestern Spain: Day‐to‐day variability and extreme episodes

Antón

Serrano

Cancillo

et al. 2008

Geophysical Research Letters

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This paper focuses on the influence of short‐term changes in total ozone column (TOC) on the variability of ultraviolet erythemal irradiance (UVER) at Badajoz (southwestern Spain). The study is performed on clear sky cases when the contribution of cloudiness and aerosols can be neglected. The period of study extends from 2001 to 2005. The results show that a reduction of 5% in TOC between two consecutive days may cause an increase of about 10% in UVER. The UVER variability associated to day‐to‐day changes in TOC presents a clear seasonal cycle with minimum values in summer and maximum in winter. Considering the monthly mean TOC value plus/minus two standard deviation as thresholds for identifying extreme events, the number of episodes with extreme low and high ozone amount was 54 and 9, respectively. The low ozone events occurred mainly in winter, causing a maximum increase of 30% in UVER.

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A method to determine the ozone radiative forcing in the ultraviolet range from experimental data

Antón

Mateos

Román

et al. 2014

J. Geophys. Res. Atmos.

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This paper proposes a method to calculate the ozone radiative forcing (RF) at surface in the ultraviolet (UV) spectral range for all-sky conditions based on the estimation of the ozone efficiency (OE) from experimental data that are subsequently applied to changes on the total ozone column (TOC) since late 1970s. The OE is defined as the rate at which the solar UV irradiance is "forced" per TOC unit, being estimated for all-sky conditions from UV-B (280-320 nm) and TOC data recorded with a Bentham spectroradiometer at Granada (Spain). The results showed a clear seasonal pattern in the OE values with largest monthly averages (in absolute terms) in July (À4.2 ± 0.3 mW/m 2 per Dobson Unit) and the smallest in January (À0.7 ± 0.3 mW/m 2 per Dobson Unit). The continuous and consistent TOC data set provided by the Multisensor Reanalysis over the study site showed that spring months present the largest annual TOC changes relative to 1979 while summer months exhibit small variations. Thus, spring has the largest contribution (~53%) to annual ozone RF followed by summer (~17%), winter (~16%), and autumn (~14%). The evolution of the ozone RF relative to 1979 in the UV-B range at Granada showed positive values for most of years (between 5 and 40 mW/m 2 ). Finally, the long-term evolution of the ozone RF exhibited a positive trend until the mid-1990s and, subsequently, a weak negative trend until the end of the analyzed period.

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Long‐term variations of UV‐B irradiance over Canada estimated from Brewer observations and derived from ozone and pyranometer measurements

Cited by 114 publications

References 31 publications

Long-term variations of the UV-B radiation over Central Europe as derived from the reconstructed UV time series

Long-term variations of the UV-B radiation over Central Europe as derived from the reconstructed UV time series

Total ozone and solar erythemal irradiance in southwestern Spain: Day‐to‐day variability and extreme episodes

A method to determine the ozone radiative forcing in the ultraviolet range from experimental data

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