Abstract
The study shows an analysis of a 7-year data set measuring Ultraviolet-B (UVB) irradiance values and ultraviolet index TABLEUVI) values derived from ground-based broadband irradiance measurements, satellite-derived total ozone, and UVB solar irradiance recorded in Valladolid (Central Spain). Ultraviolet-B (UVB) solar irradiance measurements in the range (280–315 nm) carried out during the period 2013–2019 at a continental Mediterranean solar station, located in Valladolid (Spain), were analyzed. UVB data recorded using a YES UVB-1 pyranometer were used to estimate erythemal irradiance, ultraviolet erythemal irradiance (UVER), UVI, cumulative dose, and sun protection. Hourly UVER data in January (minimum values) and June (maximum values) were analyzed as an average year for the measurement station. Differences between UVI values at solar noon and the maximum daily value were minimal. It was found that on certain summer days, maximum daily UVI and SED (cumulative daily dose) could be over 12 and 60, respectively. The cumulative dose on the horizontal surface was calculated at the station for different skin types. It was observed that over 45% of the annual dose is received in summer, about 30% in spring, over 15% in autumn, and less than 10% in winter. In addition, the relationship between the maximum daily UVI and the annual accumulated dose in SEDs was studied to provide information on sun protection under low UVI conditions.
Highlights
Ultraviolet solar irradiance (UV) causes chemical and biological processes in the lower atmosphere and at the Earth’s surface and has been widely studied in recent decades [1]
The curves of the daily and monthly ultraviolet erythemal radiation (UVER) values show a sinusoidal evolution, with minimum values in January and December monthly UVER values show a2 sinusoidal evolution, with minimum values in January and December that range between 0.43 kJ/m in January 2018 and 0.47 kJ/m2 in December 2014
The results indicate the erythemal irradiance received throughout the year in a horizontal position and for continuous and uninterrupted exposure to the sun
Summary
Ultraviolet solar irradiance (UV) causes chemical and biological processes in the lower atmosphere and at the Earth’s surface and has been widely studied in recent decades [1]. UV radiation (200–400 nm) at the top of the atmosphere represents less than 7% of total irradiance. Stratospheric ozone absorbs the shortest wavelengths (UV-C, 100–280 nm); ozone weakly absorbs wavelengths in the UVB range (280–315 nm) and as a consequence, a small part of UV-B and most UV-A (315–400 nm) radiation reach the Earth’s surface [2]. Sun height and station altitude modify the solar UV irradiance that reaches the ground because they change the sunlight’s path length into the atmosphere. UV variations at the Earth’s surface [3,4] can be caused by atmospheric components such as clouds, total ozone column, aerosols, and desert dust. 94% of UV energy at ground level corresponds to the UV-A component and 6% to UV-B [5]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
