Impact of UV-A radiation on erythemal UV and UV-index estimation over Korea

Abstract

Because total UV (TUV) in the UV-A region is 100 times higher than in the UV-B region, UV-A is a considerable component when calculating erythemal UV (EUV) and UV-index. The ratio of EUV to TUV in the UV-A value [EUV(A)/TUV(A)] is investigated to convert the EUV(A) from TUV(A) for broadband observation. The representative value of EUV(A)/TUV(A), from the simulation study, is 6.9 × 10 −4 , changing from 6.1 × 10 −4 to 7.0 × 10 −4 as aerosol optical depth, total ozone and solar zenith angle change. By adopting the observational data of EUV(B) and TUV(A) from UV-biometer measurements at Yonsei University [(37.57 • N, 126.95 • E), 84 m above sea level], the EUV irradiance increases to 15% of EUV(B) due to the consideration of EUV(A) from the data of TUV(A) observation. Compared to the total EUV observed from the Brewer spectrophotometer at the same site, the EUV(B) from the UV-biometer observes only 95% of total EUV, and its underestimation is caused by neglecting the effect of UV-A. However, the sum of EUV(B) and EUV(A) [EUV(A+B)] from two UV-biometers is 10% larger than the EUV from the Brewer spectrophotometer because of the spectral overlap effect in the range 320-340 nm. The correction factor for the overlap effect adjusts 8% of total EUV.

Estimation of Inactivation time for the SARS-CoV-2 virus from the UV biometer in South Korea

“…For the purpose of global coverage with spatially dense observation network, the EUV observation instruments have primarily been designed to the broadband observation (e.g., Seckmeyer et al 2010 ). Based on the broadband observation instruments, the EUV radiation has been monitored and analyzed by considering the variation of atmospheric conditions (e.g., clouds, ozone, and aerosol) (e.g., Fioletov et al 2001 ; McKenzie et al 2011 ; Park et al 2015 , 2016 ).…”

Erythemal UV radiation across Nigeria: where do we stand?

“…The UV-B and UV-A reaching the earth's surface cause most biological damage in humans; at varying degrees. Park et al (2015) reported that due to the varying effects of solar UV radiation, erythemal ultraviolet radiation (EUVR) was introduced to monitor and quantify the biological damages. EUVR is evaluated as the spectral UV irradiance weighted with the standard erythema action spectrum curve adopted by the Commission Internationale de l' Eclairage (CIE) in 1987; hence, the relative contribution of the irradiance at each wavelength to the induction of erythema on the human skin (McKinlay and Diffey, 1987;Fountoulakis et al, 2020;Webb et al, 2011).…”

“…The UV-B and UV-A reaching the earth's surface cause most biological damage in humans; at varying degrees. Park et al. (2015) reported that due to the varying effects of solar UV radiation, erythemal ultraviolet radiation (EUVR) was introduced to monitor and quantify the biological damages.…”

“…Globally, the study of spatial distribution and variations of EUVR has attracted attention in countries such as Egypt ( El-Nobi, 2018 ), Peninsular Malaysia ( Shah et al., 2011 ; Tan et al., 2018 ), Slovakia ( Pribullová and Chmelík, 2008 ), Thailand ( Janjai et al., 2010 ), China ( Liu et al., 2017 ), Italy ( Fountoulakis et al., 2020 ), Spain ( Utrillas et al., 2013 ) and Korea ( Park et al., 2015 ). The study aims to analyse the latitudinal variations in EUVR across Nigeria.…”

Simulation of Threshold UV Exposure Time for Vitamin D Synthesis in South Korea

“…e widely used action spectrum for the erythemal dose is that of the Commission International on Illumination (CIE) [5]. Because prolonged exposure to UV Ery leads to harmful erythemal dosing, UV Ery observation networks have focused primarily on UV-B (ranges from 280 to 315 nm) measurements, with some consideration of UV-A (ranges from 315 to 400 nm) measurements [7]. In addition to its adverse effects, UV radiation has several beneficial effects on human health, such as perceived improved appearance, enhanced mood through endorphin release, and a reduction of blood pressure [8,9].…”