Ozone variability and trend estimates from 20-years of ground-based and satellite observations at Irene station, South Africa

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dc.contributor.author Bencherif, Hassan
dc.contributor.author Toihir, Abdoulwahab M.
dc.contributor.author Mbatha, Nkanyiso
dc.contributor.author Sivakumar, Venkataraman
dc.contributor.author Du Preez, David Jean
dc.contributor.author Bègue, Nelson
dc.contributor.author Coetzee, Gerrie
dc.date.accessioned 2021-02-20T05:47:44Z
dc.date.available 2021-02-20T05:47:44Z
dc.date.issued 2020-11
dc.description.abstract While the stratospheric ozone protects the biosphere against ultraviolet (UV) radiation, tropospheric ozone acts like a greenhouse gas and an indicator of anthropogenic pollution. In this paper, we combined ground-based and satellite ozone observations over Irene site (25.90◦ S, 28.22◦ E), one of the most ancient ozone-observing stations in the southern tropics. The dataset is made of daily total columns and weekly profiles of ozone collected over 20 years, from 1998 to 2017. In order to fill in some missing data and split the total column of ozone into a tropospheric and a stratospheric column, we used satellite observations from TOMS (Total Ozone Mapping Spectrometer), OMI (Ozone Monitoring Instrument), and MLS (Microwave Limb Sounder) experiments. The tropospheric column is derived by integrating ozone profiles from an ozonesonde experiment, while the stratospheric column is obtained by subtracting the tropospheric column from the total column (recorded by the Dobson spectrometer), and by assuming that the mesospheric contribution is negligible. Each of the obtained ozone time series was then analyzed by applying the method of wavelet transform, which permitted the determination of the main forcings that contribute to each ozone time series. We then applied the multivariate Trend-Run model and the Mann–Kendall test for trend analysis. Despite the different analytical approaches, the obtained results are broadly similar and consistent. They showed a decrease in the stratospheric column (−0.56% and −1.7% per decade, respectively, for Trend-Run and Mann–Kendall) and an increase in the tropospheric column (+2.37% and +3.6%, per decade, respectively, for Trend-Run and Mann–Kendall). Moreover, the results presented here indicated that the slowing down of the total ozone decline is somewhat due to the contribution of the tropospheric ozone concentration. en_ZA
dc.description.department Geography, Geoinformatics and Meteorology en_ZA
dc.description.librarian pm2021 en_ZA
dc.description.sponsorship The CNRS (Centre National de la Recherche Scientifique) and the NRF (National Research Foundation) in the framework of the IRP ARSAIO and by the South Africa/France PROTEA Program (project No. 42470VA), and by Université de la Réunion through the OMNCG (Observatoire des Milieux Naturels et des Changements Globaux) federation of the OSU-Reunion (Observatoire des Sciences de l’Univers—La Réunion). en_ZA
dc.description.uri http://www.mdpi.com/journal/atmosphere en_ZA
dc.identifier.citation Bencherif, H., Toihir, A.M., Mbatha, N. et al. 2020, 'Ozone variability and trend estimates from 20-years of ground-based and satellite observations at Irene Station, South Africa', Atmosphere, vol. 11, no. 11, art. 1216, pp. 1-22. en_ZA
dc.identifier.issn 2073-4433 (online)
dc.identifier.other 10.3390/atmos11111216
dc.identifier.uri http://hdl.handle.net/2263/78782
dc.language.iso en en_ZA
dc.publisher MDPI en_ZA
dc.rights © 2020 by the authors. Licensee: MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). en_ZA
dc.subject Atmospheric composition en_ZA
dc.subject Southern tropics en_ZA
dc.subject South Africa (SA) en_ZA
dc.subject Ozone observation en_ZA
dc.title Ozone variability and trend estimates from 20-years of ground-based and satellite observations at Irene station, South Africa en_ZA
dc.type Article en_ZA


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