Diffuse UV erythemal radiation experimental values

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

doi:10.1029/2007jd008846

Cited by 31 publications

(39 citation statements)

References 14 publications

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“…This is because these models were originally developed for the entire bandwidth of the solar spectrum where the diffuse component is only 10% of the total irradiance , in contrast to the UVER range the diffuse com- ponent on clear days gets to values of 60% (Utrillas et al, 2007); therefore the conditions of anisotropy do not correspond to the predictions of the models.…”

Section: Global Uver On Inclined Surfaces For Cloudless Skiesmentioning

confidence: 91%

“…This band prevents direct sun radiation to reach the detector unit, which makes diffuse irradiance measurements, also in the horizontal plane (Figure 1). The diffuse UVER measurements obtained with the shadowband have been corrected using the modified Batlles model proposed by Utrillas et al (2007). The corrected experimental values have an uncertainty estimated at 1%.…”

Section: Instrumentationmentioning

confidence: 99%

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Measurement and modelling of global erythemal irradiance on inclined planes

Serrano¹

2010

Tethys

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The aim of this paper is the characterization of global erythemal irradiance (UVER) on inclined planes. Different geometric models have been studied, both isotropic and anisotropic, which have been used to estimate the global UVER on inclined planes at 40• in North, South, East and West orientations. This has led to the hypothesis that these models, all of them originally developed to obtain diffuse irradiance in solar spectrum, can be applied in a much more limited range of UVER. The results have been compared with experimental data using the following statistical parameters: mean bias deviation, mean absolute deviation and root mean square deviation. The global UVER was analyzed for all sky conditions and for cloudless sky conditions, and no significant differences were found between the different models in both cases. Overall, the best performing model is Gueymard's anisotropic model, even though it improves the Isotropic model in less than 2%.

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Section: Global Uver On Inclined Surfaces For Cloudless Skiesmentioning

confidence: 91%

Section: Instrumentationmentioning

confidence: 99%

Measurement and modelling of global erythemal irradiance on inclined planes

Serrano¹

2010

Tethys

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“…The diffuse component of the solar radiation is usually quantified by the diffuse fraction (f ) (Liu and Jordan, 1960;Iziomon and Aro, 1998;Utrillas et al, 2007), defined as the ratio between the diffuse (D) and the global (G) solar irradiances at the surface. The diffuse fraction describes the effectiveness of the atmosphere in scattering the incoming radiation.…”

Section: Methodsmentioning

confidence: 99%

“…For instance, diffuse UVER irradiance under a standard beach umbrella can reach 34 % of global UVER irradiance (Utrillas et al, 2007) and up to 60 % in tree shade (Parisi, 2000). This percentage increases notably with high load of aerosols and presence of clouds, especially in the case of broken clouds (Alados et al, 2000;Calbó et al, 2005;Esteve et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Modeling the erythemal surface diffuse irradiance fraction for Badajoz, Spain

2017

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Abstract. Despite its important role on the human health and numerous biological processes, the diffuse component of the erythemal ultraviolet irradiance (UVER) is scarcely measured at standard radiometric stations and therefore needs to be estimated. This study proposes and compares 10 empirical models to estimate the UVER diffuse fraction. These models are inspired from mathematical expressions originally used to estimate total diffuse fraction, but, in this study, they are applied to the UVER case and tested against experimental measurements. In addition to adapting to the UVER range the various independent variables involved in these models, the total ozone column has been added in order to account for its strong impact on the attenuation of ultraviolet radiation. The proposed models are fitted to experimental measurements and validated against an independent subset. The bestperforming model (RAU3) is based on a model proposed by Ruiz-Arias et al. (2010) and shows values of r 2 equal to 0.91 and relative root-mean-square error (rRMSE) equal to 6.1 %. The performance achieved by this entirely empirical model is better than those obtained by previous semi-empirical approaches and therefore needs no additional information from other physically based models. This study expands on previous research to the ultraviolet range and provides reliable empirical models to accurately estimate the UVER diffuse fraction.

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“…The instrument was calibrated in the National Institute for Aerospace Technology (INTA) at El Arenosillo, Spain [3]. The diffuse UVER measurements obtained with the shadowband have been corrected using the modified Batlles model proposed by Utrillas et al [4]. This correction has an uncertainty estimated of 1%.…”

Section: Instrumentationmentioning

confidence: 99%

Estimation of cloud optical depth for low clouds from UV erythemal irradiance

Serrano¹,

Marı́n²,

Utrillas³

et al. 2013

AIP Conference Proceedings

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A method of estimating cloud transmission in the UV spectral range using data from different satellite measurements and reanalysis AIP Conference Proceedings 1531, 911 (2013) Abstract. A methodology to calculate the cloud optical depth for overcast and partly covered skies is proposed. It is based in a combination of measurements of surface diffuse UV erythemal irradiance (UVER), a sky camera for estimation of the cloud cover and radiative transfer simulations by means of SBDART. Data refer to the year 2011 in the city of Valencia (Spain). The results show that in most cases cloud optical depth values are in the interval between 10-20, being the cloud optical depth less than 70 in more than 80% of cases. The monthly cloud optical depth over the year was also studied, as a result, values are found to be higher during the rainy seasons in Valencia (April and September).

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Diffuse UV erythemal radiation experimental values

Cited by 31 publications

References 14 publications

Measurement and modelling of global erythemal irradiance on inclined planes

Measurement and modelling of global erythemal irradiance on inclined planes

Modeling the erythemal surface diffuse irradiance fraction for Badajoz, Spain

Estimation of cloud optical depth for low clouds from UV erythemal irradiance

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