Solar Ultraviolet Radiation in Pretoria and Its Relations to Aerosols and Tropospheric Ozone during the Biomass Burning Season
| Autor: | Caradee Y. Wright, Thierry Portafaix, Kévin Lamy, D. Jean du Preez, Hassan Bencherif |
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| Přispěvatelé: | Laboratoire de l'Atmosphère et des Cyclones (LACy), Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Department of Geography, Geoinformatics and Meteorology [Pretoria], University of Pretoria [South Africa], School of Physics, University of KwaZulu-Natal, University of KwaZulu-Natal (UKZN), Medical Research Council [South African] |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Ozone
010504 meteorology & atmospheric sciences air pollution Air pollution environmental health aerosol optical depth 010501 environmental sciences Environmental Science (miscellaneous) Noon lcsh:QC851-999 Atmospheric sciences medicine.disease_cause 7. Clean energy 01 natural sciences chemistry.chemical_compound medicine ddc:610 Tropospheric ozone 0105 earth and related environmental sciences [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Biomass (ecology) UV Aerosol Trace gas ozone chemistry 13. Climate action atmospheric science Africa Environmental science lcsh:Meteorology. Climatology Ultraviolet index |
| Zdroj: | Atmosphere, Vol 12, Iss 132, p 132 (2021) Atmosphere Volume 12 Issue 2 Atmosphere, MDPI 2021, 12 (2), pp.132. ⟨10.3390/atmos12020132⟩ |
| ISSN: | 2073-4433 |
| DOI: | 10.3390/atmos12020132⟩ |
| Popis: | Biomass burning has an impact on atmospheric composition as well as human health and wellbeing. In South Africa, the biomass burning season extends from July to October and affects the aerosol loading and tropospheric ozone concentrations which in turn impact solar ultraviolet radiation (UVR) levels at the surface. Using ground-based observations of aerosols, tropospheric ozone and solar UVR (as well as modelled solar UVR) we investigated the impact of aerosols and tropospheric ozone on solar UVR in August, September, and October over Pretoria. Aerosol optical depth (AOD) and tropospheric ozone reached a peak between September and October each year. On clear-sky days, the average relative difference between the modelled and observed solar Ultraviolet Index (UVI) levels (a standard indicator of surface UVR) at solar noon was 7%. Using modelled UVR&mdash which included and excluded the effects of aerosols and tropospheric ozone from biomass burning&mdash aerosols had a larger radiative effect compared to tropospheric ozone on UVI levels during the biomass burning season. Excluding only aerosols resulted in a 10% difference between the modelled and observed UVI, while excluding only tropospheric ozone resulted in a difference of &minus 2%. Further understanding of the radiative effect of aerosols and trace gases, particularly in regions that are affected by emissions from biomass burning, is considered important for future research. |
| Databáze: | OpenAIRE |
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