Diffuse Ultraviolet Erythemal Irradiance on Inclined Planes: A Comparison of Experimental and Modeled Data

Utrillas, M. P.; Marı́n, Marı́a José; Esteve, Anna R.; Estellés, V.; Tena, F.; Cañada, J.; Martínez‐Lozano, J. A.

doi:10.1111/j.1751-1097.2009.00573.x

Cited by 13 publications

(11 citation statements)

References 33 publications

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“…where D g is the reflected component from the ground and f d , f g the respective fractions of diffuse radiation from the sky and of the radiation reflected from the ground. According to (9), f d and f g can be expressed by the following relations:…”

Section: Discussionmentioning

confidence: 99%

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Applicability of the Polysulphone Horizontal Calibration to Differently Inclined Dosimeters

Casale¹,

Siani²,

Diémoz³

et al. 2011

Photochem & Photobiology

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Polysulphone (PS) dosimetry has been a widely used technique for more than 30 years to quantify the erythemally effective UV dose received by anatomic sites (personal exposure). The calibration of PS dosimeters is an important issue as their spectral response is different from the erythemal action spectrum. It is performed exposing a set of PS dosimeters on a horizontal plane and measuring the UV doses received by dosimeters using calibrated spectroradiometers or radiometers. In this study, data collected during PS field campaigns (from 2004 to 2006), using horizontal and differently inclined dosimeters, were analyzed to provide some considerations on the transfer of the horizontal calibration to differently inclined dosimeters, as anatomic sites usually are. The role of sky conditions, of the angle of incidence between the sun and the normal to the slope, and of the type of surrounding surface on the calibration were investigated. It was concluded that PS horizontal calibrations apply to differently inclined dosimeters for incidence angles up to approximately 70° and for surfaces excluding ones with high albedo. Caution should be used in the application of horizontal calibrations for cases of high-incidence angle and/or high albedo surfaces.

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Section: Discussionmentioning

confidence: 99%

“…Parisi and Kimlin (4) showed that a surface oriented in a sun-normal direction receives UV radiation even 27% more than horizontal surface. Moreover, the continuously changing UV radiation field leads to significant problems of measuring and modeling (5)(6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

Applicability of the Polysulphone Horizontal Calibration to Differently Inclined Dosimeters

Casale¹,

Siani²,

Diémoz³

et al. 2011

Photochem & Photobiology

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“…Based on these reasons, some researchers have investigated UVR using vertical angles because they could better account for the position of the eyes or some areas of the skin and subsequently compared these data with horizontal UVR (Webb et al 1999;Sobolewski et al 2008;Hu et al 2010b). Other researchers have measured UVR on inclined planes with fixed angles (Esteve et al 2006;Utrillas et al 2009;Navntoft et al 2012); Oppenrieder et al (2004Oppenrieder et al ( ), (2005 measured erythemally weighted UV irradiance at azimuth intervals of 15°on 0°and 45°inclined planes by the use of a fully automatic measuring system, an angle scanning radiometer. Casale et al (2012) used south-facing polysulphone (PS) dosimetry to measure erythemal intensity on the seven inclined planes of which the angular intervals were 15°.…”

Section: Introductionmentioning

confidence: 99%

The angular distributions of ultraviolet spectral irradiance at different solar elevation angles under clear sky conditions

Liu

Wang

et al. 2015

Int J Biometeorol

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To investigate the angular distributions of UVA, UVB, and effective UV for erythema and vitamin D (vitD) synthesis, the UV spectral irradiances were measured at ten inclined angles (from 0° to 90°) and seven azimuths (from 0° to 180°) at solar elevation angle (SEA) that ranged from 18.8° to 80° in Shanghai (31.22° N, 121.55° E) under clear sky and the albedo of ground was 0.1. The results demonstrated that in the mean azimuths and with the back to the sun, the UVA, UVB, and erythemally and vitD-weighted irradiances increased with the inclined angles and an increase in SEA. When facing toward the sun at 0°-60° inclined angles, the UVA first increased and then decreased with an increase in SEA; at other inclined angles, the UVA increased with SEA. At 0°-40° inclined angles, the UVB and erythemally and vitD-weighted irradiances first increased and then decreased with an increase in SEA, and their maximums were achieved at SEA 68.7°; at other inclined angles, the above three irradiances increased with an increase in SEA. The maximum UVA, UVB, and erythemally and vitD-weighted irradiances were achieved at an 80° inclined angle at SEA 80° (the highest in our measurements); the cumulative exposure of the half day achieved the maximum at a 60° inclined angle, but not on the horizontal. This study provides support for the assessment of human skin sun exposure.

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“…[5] Although global solar UV radiation is frequently registered at many radiometric stations worldwide, its diffuse fraction is scarcely measured, and therefore, information about the direct-to-diffuse partitioning is usually unavailable. To our knowledge, only few studies have reported experimental solar UV diffuse measurements [Parisi et al, 2000[Parisi et al, , 2001Grant and Gao, 2003;Utrillas et al, 2007Utrillas et al, , 2009Utrillas, 2010;Turnbull et al, 2005;Turnbull and Parisi, 2008;Nuñez et al, 2012].…”

Section: Introductionmentioning

confidence: 99%

Shadow‐band correction for diffuse ultraviolet radiation measurements

2013

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[1] Although the correction of shadow-band solar total diffuse measurements has been extensively studied, the case of diffuse ultraviolet measurements has not been properly addressed. This study analyzes the correction factor to be applied to experimental measurements performed adapting a shadow-band to a UV radiometer at a radiometric station in Badajoz (Spain). Three different models, based on approaches widely used for correcting total diffuse measurements, have been revised and adapted for the ultraviolet spectral range. Results reveal that some aspects of the correction proposed for total diffuse radiation are not suitable for ultraviolet diffuse radiation. The mathematical expressions are consequently modified to match the behavior in the ultraviolet range. Thus, three correction models particularized for ultraviolet diffuse measurements are proposed and validated against experimental data. The two models adapted from the original expressions proposed by Battles et al., and Steven show the best performance, with rRMSE of 2.74% and 2.20% and rMBE of 1.53% and 0.46%, respectively.Citation: Sa´nchez, G., A. Serrano, and M. L. Cancillo (2013), Shadow-band correction for diffuse ultraviolet radiation measurements,

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Diffuse Ultraviolet Erythemal Irradiance on Inclined Planes: A Comparison of Experimental and Modeled Data

Cited by 13 publications

References 33 publications

Applicability of the Polysulphone Horizontal Calibration to Differently Inclined Dosimeters

Applicability of the Polysulphone Horizontal Calibration to Differently Inclined Dosimeters

The angular distributions of ultraviolet spectral irradiance at different solar elevation angles under clear sky conditions

Shadow‐band correction for diffuse ultraviolet radiation measurements

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