On the relationship between erythemal and vitamin D action spectrum weighted ultraviolet radiation

Fioletov, Vitali; McArthur, L. J. B.; Mathews, Thomas W.; Marrett, Loraine D.

doi:10.1016/j.jphotobiol.2008.11.014

Cited by 76 publications

(57 citation statements)

References 35 publications

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“…Fioletov et al (2009) studied the relationship of UVER and vitamin-D. The following authors compared the biological active UV radiation in two different high altitude stations: Ambach et al (1991) and Blumthaler et al (1997).…”

Section: Introductionmentioning

confidence: 99%

Measurements and attenuation of erythemal radiation in Central Spain

Miguel

Bilbao

Román

et al. 2011

Intl Journal of Climatology

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Biologically active ultraviolet (UVER, 280-400 nm) and global (300-3000 nm) solar irradiances have been recorded and analysed in a rural area in Valladolid (Spain) for a period of 49 months between June 2002 and December 2008. UVER daily measurements follow the pattern of the solar elevation angle and maximum hourly average irradiances occur in July, 0.20 Wm −2 and minimum, 0.03 Wm −2 , in December at noon; the total accumulated UVER along a year reaches 1470 kJm −2 . The temporal evolution of the erythemal ultraviolet radiation and its distribution under different sky conditions have been studied, being 25% clear, 57% partly cloudy and 18% overcast days. The most representative statistical characteristics of the hourly and daily UVER data have been evaluated for different sky conditions and the fundamental indices show symmetry with respect to solar noon. Maximum values may be considered as representative of the UVER characteristics in the area, whereas the minimum values are not significant, mainly during summertime. The UVER records show quite stable values in the analysed period, particularly along the months of July. The isoline-set of the first four moment distribution of the hourly UVER values has been plotted and the relative gradients are shown. The results are compared with the values obtained in other stations. The UVER cloud attenuation through the atmosphere shows that the transmitted percentage increases from winter to summer and a maximum value of 10% was achieved in July and a minimum of 30% in winter and spring.

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Section: Introductionmentioning

confidence: 99%

Measurements and attenuation of erythemal radiation in Central Spain

Miguel

Bilbao

Román

et al. 2011

Intl Journal of Climatology

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“…Fountoulakis et al: Temperature dependence of the Brewer global UV measurements B irradiance that reaches the Earth surface (Fioletov et al, 2001;Kerr and McElroy, 1993;McKenzie et al, 1999) and quantified the interaction between the solar UV irradiance, the Earth surface and the atmospheric components which mainly control its levels, such as ozone, sulfur dioxide, aerosols and clouds (e.g., Arola et al, 2003;Bais et al, 1993;Bernhard et al, 2007;Fioletov et al, 1998). Spectral measurements from Brewers have been used widely for climatological studies of biologically effective UV doses (e.g., Fioletov et al, 2003Fioletov et al, , 2009Kimlin, 2004), validation of satellite products (e.g., Arola et al, 2002;Bernhard et al, 2015;Kazadzis et al, 2009) and validation of radiative transfer models (Kazantzidis et al, 2001;Mayer et al, 1997). Lately, spectra from stations with long measurement records have been used for the study of the changes of the solar UV irradiance, showing that changes in air quality and climate have an important impact on its short-and long-term variability (De Bock et al, 2014;Fountoulakis et al, 2016a;Fragkos et al, 2016;Lakkala et al, 2017;Simic et al, 2011;Smedley et al, 2012;Zerefos et al, 2012).…”

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confidence: 99%

Temperature dependence of the Brewer global UV measurements

et al. 2017

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Abstract. Spectral measurements of global UV irradiance recorded by Brewer spectrophotometers can be significantly affected by instrument-specific optical and mechanical features. Thus, proper corrections are needed in order to reduce the associated uncertainties to within acceptable levels. The present study aims to contribute to the reduction of uncertainties originating from changes in the Brewer internal temperature, which affect the performance of the optical and electronic parts, and subsequently the response of the instrument. Until now, measurements of the irradiance from various types of lamps at different temperatures have been used to characterize the instruments' temperature dependence. The use of 50 W lamps was found to induce errors in the characterization due to changes in the transmissivity of the Teflon diffuser as it warms up by the heat of the lamp. In contrast, the use of 200 or 1000 W lamps is considered more appropriate because they are positioned at longer distances from the diffuser so that warming is negligible. Temperature gradients inside the instrument can cause mechanical stresses which can affect the instrument's optical characteristics. Therefore, during the temperature-dependence characterization procedure warming or cooling must be slow enough to minimize these effects. In this study, results of the temperature characterization of eight different Brewer spectrophotometers operating in Greece, Finland, Germany and Spain are presented. It was found that the instruments' response changes differently in different temperature regions due to different responses of the diffusers' transmittance. The temperature correction factors derived for the Brewer spectrophotometers operating at Thessaloniki, Greece, and Sodankylä, Finland, were evaluated and were found to remove the temperature dependence of the instruments' sensitivity.

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“…standard vitamin-D dose SDD measure of the accumulated previtamin-D-production-rate weighted UV energy where 1 SDD is equivalent to 100 J·m -2 Note This is not the same definition as used by Webb (2006) or by Fioletov (2008).…”

Section: Discussionmentioning

confidence: 99%

Estimation of the Earth’s surface illumination by space reflector designed to stabilize atmosphere temperature regime

Старовойтов¹

2017

EJSI

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On the relationship between erythemal and vitamin D action spectrum weighted ultraviolet radiation

Cited by 76 publications

References 35 publications

Measurements and attenuation of erythemal radiation in Central Spain

Measurements and attenuation of erythemal radiation in Central Spain

Temperature dependence of the Brewer global UV measurements

Estimation of the Earth’s surface illumination by space reflector designed to stabilize atmosphere temperature regime

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