Spring and summer time ozone and solar ultraviolet radiation variations over Cape Point, South Africa

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.
Document type :
Journal articles
Complete list of metadatas

Cited literature [20 references]  Display  Hide  Download

http://hal.univ-reunion.fr/hal-02097468
Contributor : Réunion Univ <>
Submitted on : Friday, April 12, 2019 - 8:16:54 AM
Last modification on : Saturday, April 13, 2019 - 1:16:21 AM

File

du Preez et al, ANGEO 2019.pdf
Publication funded by an institution

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

David Du Preez, Jelena Ajti´c, Hassan Bencherif, Nelson Bègue, Jean-Maurice Cadet, et al.. Spring and summer time ozone and solar ultraviolet radiation variations over Cape Point, South Africa. Annales Geophysicae, European Geosciences Union, 2019, 37 (2), pp.129-141. ⟨https://www.ann-geophys.net/37/129/2019/⟩. ⟨10.5194/angeo-37-129-2019⟩. ⟨hal-02097468⟩

Share

Metrics

Record views

50

Files downloads

43