Spring and summer time ozone and solar ultraviolet radiation variations over Cape Point, South Africa
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Published:2019-03-06
Issue:2
Volume:37
Page:129-141
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ISSN:1432-0576
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Container-title:Annales Geophysicae
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language:en
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Short-container-title:Ann. Geophys.
Author:
du Preez David J.ORCID, Ajtić Jelena V., Bencherif Hassan, Bègue Nelson, Cadet Jean-Maurice, Wright Caradee Y.
Abstract
Abstract. 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∘ with exponential
fit R2 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.
Publisher
Copernicus GmbH
Subject
Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Geology,Astronomy and Astrophysics
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