Spring and summer time ozone and solar ultraviolet radiation variations over Cape Point, South Africa
Authorsdu Preez, David J.
Article (Published version)
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The correlation between solar ultraviolet radiation (UV) and atmospheric ozone is well understood. Decreased stratospheric ozone levels which led to increased solar UV radiation levels at the surface have been recorded. These increased levels of solar UV radiation have potential negative impacts on public health. This study was done to determine whether the break-up of the Antarctic ozone hole has an impact on stratospheric columnar ozone (SCO) and resulting ambient solar UV-B radiation levels at Cape Point, South Africa, over 2007-2016. We investigated the correlations between UV index, calculated from ground-based solar UV-B radiation measurements and satellite-retrieved column ozone data. The strongest anti-correlation on clear-sky days was found at solar zenith angle 25 degrees with exponential fit R-2 values of 0.45 and 0.53 for total ozone column and SCO, respectively. An average radiation amplification factor of 0.59 across all SZAs was calculated for clear-sky days. The MIMOSA-...CHIM model showed that the polar vortex had a limited effect on ozone levels. Tropical air masses more frequently affect the study site, and this requires further investigation.
Source:Annales Geophysicae, 2019, 37, 2, 129-141
- Copernicus Gesellschaft Mbh, Gottingen
- New Zealand Deep South National Science Challenge
- National Institute of Water and Atmospheric Research, New Zealand
- South African Medical Research Council
- National Research Foundation of South AfricaNational Research Foundation - South Africa