Spatiotemporal distributions of ultraviolet radiation from OMI orbital data and relationships with total O3 and total NO2

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Adriana Becerra-Rondón
Jorge Ducati
Rafael Haag


Ultraviolet radiation (UVR) plays a key role in the photochemistry of the atmosphere, through absorption or dispersion processes by its constituents (ozone, cloudiness, aerosols, and pollutants in the troposphere). Quantifying UVR in a spatial-temporal way and knowing its relationships with modulating variables is important for Rio Grande do Sul State, a region with one of Brazil’s highest skin neoplasms rates. Ultraviolet radiation data for the region, acquired by the Ozone Monitoring Instrument (OMI) for the period 2006 to 2020, and expressed in terms of erythemal daily dose (EDD), was used in this study, with the objective of quantifying UVR incidence and its stability in time and spatial distribution. Our results show that for this study area the radiation varies from 3300 to 3700 J m–2, with a latitudinal gradient of 66.7 J m–2 per degree, with maxima recorded in December (6028 J m–2, summer) and minima in June (1123 J m–2, winter). A long-term decreasing trend of 29.76% (z value = –2) was observed in the area, while 6.19% of the area had an increasing trend (z value = 5). During the studied period of 15 years, occurrences of high values of EDD were negatively correlated with total O3 as the dominant relationship. Positive or negative correlations with total NO2 were also recorded, depending on the investigated season or region.


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