Articles | Volume 20, issue 17
https://doi.org/10.5194/acp-20-10637-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-20-10637-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Measurement report
| 
11 Sep 2020
Measurement report |
| 11 Sep 2020
| 11 Sep 2020
Measurement report: Statistical modelling of long-term trends of atmospheric inorganic gaseous species within proximity of the pollution hotspot in South Africa
Jan-Stefan Swartz
Atmospheric Chemistry Research Group, Chemical Resource Beneficiation, North-West University, Potchefstroom, 2520, South
Africa
Pieter G. van Zyl
CORRESPONDING AUTHOR
Atmospheric Chemistry Research Group, Chemical Resource Beneficiation, North-West University, Potchefstroom, 2520, South
Africa
Johan P. Beukes
Atmospheric Chemistry Research Group, Chemical Resource Beneficiation, North-West University, Potchefstroom, 2520, South
Africa
Corinne Galy-Lacaux
Laboratoire d'Aérologie, Université de Toulouse, CNRS, UPS, 31400 Toulouse, France
Avishkar Ramandh
Research and Technology, Sasol Technology (Pty) Limited, Sasolburg, 1947, South Africa
Jacobus J. Pienaar
Atmospheric Chemistry Research Group, Chemical Resource Beneficiation, North-West University, Potchefstroom, 2520, South
Africa
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Atmos. Chem. Phys., 22, 10291–10317, https://doi.org/10.5194/acp-22-10291-2022, https://doi.org/10.5194/acp-22-10291-2022, 2022
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A detailed size-resolved assessment of the chemical characteristics of outdoor and indoor aerosols collected in low-income urban settlements in South Africa indicated the significance of household combustion for cooking and space heating – an important source of pollutants in the developing world – to atmospheric chemical composition. The regional impact of industrial sources in the highly industrialised and densely populated north-eastern interior of South Africa was also evident.
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Aerosol particles are an important part of the Earth system, but their concentrations are spatially and temporally heterogeneous, as well as being variable in size and composition. Here, we present a new compilation of PM2.5 and PM10 aerosol observations, focusing on the spatial variability across different observational stations, including composition, and demonstrate a method for comparing the data sets to model output.
Eric Martial Yao, Fabien Solmon, Marcellin Adon, Claire Delon, Corinne Galy-Lacaux, Graziano Giuliani, Bastien Sauvage, and Véronique Yoboue
EGUsphere, https://doi.org/10.5194/egusphere-2024-3179, https://doi.org/10.5194/egusphere-2024-3179, 2025
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As climate change and human activities intensify in Africa, understanding how air pollution, climate, and natural cycles interact is crucial. This study explores how nitrogen oxide emissions from African soils, especially in dry regions, contribute to atmospheric pollution. By using a climate-chemistry model, we show that considering these emissions improves predictions of nitrogen dioxide, nitric acid and ozone, although some discrepancies remain compared to observations.
Hagninou Elagnon Venance Donnou, Aristide Barthélémy Akpo, Money Ossohou, Claire Delon, Véronique Yoboué, Dungall Laouali, Marie Ouafo-Leumbe, Pieter Gideon Van Zyl, Ousmane Ndiaye, Eric Gardrat, Maria Dias-Alves, and Corinne Galy-Lacaux
Atmos. Chem. Phys., 24, 13151–13182, https://doi.org/10.5194/acp-24-13151-2024, https://doi.org/10.5194/acp-24-13151-2024, 2024
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Ozone is a secondary air pollutant that is detrimental to human and plant health. A better understanding of its chemical evolution is a challenge for Africa, where it is still undersampled. Out of 14 sites examined (1995–2020), high levels of O3 are reported in southern Africa. The dominant chemical processes leading to O3 formation are identified. A decrease in O3 is observed at Katibougou (Mali) and Banizoumbou (Niger), and an increase is found at Zoétélé (Cameroon) and Skukuza (South Africa).
Natalie M. Mahowald, Longlei Li, Julius Vira, Marje Prank, Douglas S. Hamilton, Hitoshi Matsui, Ron L. Miller, Louis Lu, Ezgi Akyuz, Daphne Meidan, Peter Hess, Heikki Lihavainen, Christine Wiedinmyer, Jenny Hand, Maria Grazia Alaimo, Célia Alves, Andres Alastuey, Paulo Artaxo, Africa Barreto, Francisco Barraza, Silvia Becagli, Giulia Calzolai, Shankarararman Chellam, Ying Chen, Patrick Chuang, David D. Cohen, Cristina Colombi, Evangelia Diapouli, Gaetano Dongarra, Konstantinos Eleftheriadis, Corinne Galy-Lacaux, Cassandra Gaston, Dario Gomez, Yenny González Ramos, Hannele Hakola, Roy M. Harrison, Chris Heyes, Barak Herut, Philip Hopke, Christoph Hüglin, Maria Kanakidou, Zsofia Kertesz, Zbiginiw Klimont, Katriina Kyllönen, Fabrice Lambert, Xiaohong Liu, Remi Losno, Franco Lucarelli, Willy Maenhaut, Beatrice Marticorena, Randall V. Martin, Nikolaos Mihalopoulos, Yasser Morera-Gomez, Adina Paytan, Joseph Prospero, Sergio Rodríguez, Patricia Smichowski, Daniela Varrica, Brenna Walsh, Crystal Weagle, and Xi Zhao
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2024-1, https://doi.org/10.5194/essd-2024-1, 2024
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Aerosol particles can interact with incoming solar radiation and outgoing long wave radiation, change cloud properties, affect photochemistry, impact surface air quality, and when deposited impact surface albedo of snow and ice, and modulate carbon dioxide uptake by the land and ocean. Here we present a new compilation of aerosol observations including composition, a methodology for comparing the datasets to model output, and show the implications of these results using one model.
Money Ossohou, Jonathan Edward Hickman, Lieven Clarisse, Pierre-François Coheur, Martin Van Damme, Marcellin Adon, Véronique Yoboué, Eric Gardrat, Maria Dias Alvès, and Corinne Galy-Lacaux
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The updated analyses of ground-based concentrations and satellite total vertical columns of atmospheric ammonia help us to better understand 21st century ammonia dynamics in sub-Saharan Africa. We conclude that the drivers of trends are agriculture in the dry savanna of Katibougou, Mali; air temperature and agriculture in the wet savanna of Djougou, Benin, and Lamto, Côte d'Ivoire; and leaf area index, air temperature, residential, and agriculture in forests of Bomassa, Republic of Congo.
Matti Räsänen, Mika Aurela, Ville Vakkari, Johan P. Beukes, Juha-Pekka Tuovinen, Pieter G. Van Zyl, Miroslav Josipovic, Stefan J. Siebert, Tuomas Laurila, Markku Kulmala, Lauri Laakso, Janne Rinne, Ram Oren, and Gabriel Katul
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Mohamed Lamine Kassamba-Diaby, Corinne Galy-Lacaux, Veronique Yoboué, Jonathan E. Hickman, Kerneels Jaars, Sylvain Gnamien, Richmond Konan, Eric Gardrat, and Siele Silué
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This work presents the chemical composition of precipitation from 2018 to 2020 at three sites representative of a south-north transect in Côte d'Ivoire. It includes two urban sites (Abidjan and Korhogo) and one rural site (Lamto). Measured rain chemical content and wet deposition fluxes highlights different dominant sources contributions i.e anthropogenic sources (traffic, construction, industry) at urban sites and biomass burning at the rural site.
Flossie Brown, Gerd A. Folberth, Stephen Sitch, Susanne Bauer, Marijn Bauters, Pascal Boeckx, Alexander W. Cheesman, Makoto Deushi, Inês Dos Santos Vieira, Corinne Galy-Lacaux, James Haywood, James Keeble, Lina M. Mercado, Fiona M. O'Connor, Naga Oshima, Kostas Tsigaridis, and Hans Verbeeck
Atmos. Chem. Phys., 22, 12331–12352, https://doi.org/10.5194/acp-22-12331-2022, https://doi.org/10.5194/acp-22-12331-2022, 2022
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Surface ozone can decrease plant productivity and impair human health. In this study, we evaluate the change in surface ozone due to climate change over South America and Africa using Earth system models. We find that if the climate were to change according to the worst-case scenario used here, models predict that forested areas in biomass burning locations and urban populations will be at increasing risk of ozone exposure, but other areas will experience a climate benefit.
Constance K. Segakweng, Pieter G. van Zyl, Cathy Liousse, Johan P. Beukes, Jan-Stefan Swartz, Eric Gardrat, Maria Dias-Alves, Brigitte Language, Roelof P. Burger, and Stuart J. Piketh
Atmos. Chem. Phys., 22, 10291–10317, https://doi.org/10.5194/acp-22-10291-2022, https://doi.org/10.5194/acp-22-10291-2022, 2022
Short summary
Short summary
A detailed size-resolved assessment of the chemical characteristics of outdoor and indoor aerosols collected in low-income urban settlements in South Africa indicated the significance of household combustion for cooking and space heating – an important source of pollutants in the developing world – to atmospheric chemical composition. The regional impact of industrial sources in the highly industrialised and densely populated north-eastern interior of South Africa was also evident.
Julius Vira, Peter Hess, Money Ossohou, and Corinne Galy-Lacaux
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Ammonia is one of the main components of nitrogen deposition. Here we use a new model to assess the ammonia emissions from agriculture, the largest anthropogenic source of ammonia. The model results are consistent with earlier estimates over industrialized regions in agreement with observations. However, the model predicts much higher emissions over sub-Saharan Africa compared to earlier estimates. Available observations from surface stations and satellites support these higher emissions.
Clémence Rose, Martine Collaud Coen, Elisabeth Andrews, Yong Lin, Isaline Bossert, Cathrine Lund Myhre, Thomas Tuch, Alfred Wiedensohler, Markus Fiebig, Pasi Aalto, Andrés Alastuey, Elisabeth Alonso-Blanco, Marcos Andrade, Begoña Artíñano, Todor Arsov, Urs Baltensperger, Susanne Bastian, Olaf Bath, Johan Paul Beukes, Benjamin T. Brem, Nicolas Bukowiecki, Juan Andrés Casquero-Vera, Sébastien Conil, Konstantinos Eleftheriadis, Olivier Favez, Harald Flentje, Maria I. Gini, Francisco Javier Gómez-Moreno, Martin Gysel-Beer, Anna Gannet Hallar, Ivo Kalapov, Nikos Kalivitis, Anne Kasper-Giebl, Melita Keywood, Jeong Eun Kim, Sang-Woo Kim, Adam Kristensson, Markku Kulmala, Heikki Lihavainen, Neng-Huei Lin, Hassan Lyamani, Angela Marinoni, Sebastiao Martins Dos Santos, Olga L. Mayol-Bracero, Frank Meinhardt, Maik Merkel, Jean-Marc Metzger, Nikolaos Mihalopoulos, Jakub Ondracek, Marco Pandolfi, Noemi Pérez, Tuukka Petäjä, Jean-Eudes Petit, David Picard, Jean-Marc Pichon, Veronique Pont, Jean-Philippe Putaud, Fabienne Reisen, Karine Sellegri, Sangeeta Sharma, Gerhard Schauer, Patrick Sheridan, James Patrick Sherman, Andreas Schwerin, Ralf Sohmer, Mar Sorribas, Junying Sun, Pierre Tulet, Ville Vakkari, Pieter Gideon van Zyl, Fernando Velarde, Paolo Villani, Stergios Vratolis, Zdenek Wagner, Sheng-Hsiang Wang, Kay Weinhold, Rolf Weller, Margarita Yela, Vladimir Zdimal, and Paolo Laj
Atmos. Chem. Phys., 21, 17185–17223, https://doi.org/10.5194/acp-21-17185-2021, https://doi.org/10.5194/acp-21-17185-2021, 2021
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Aerosol particles are a complex component of the atmospheric system the effects of which are among the most uncertain in climate change projections. Using data collected at 62 stations, this study provides the most up-to-date picture of the spatial distribution of particle number concentration and size distribution worldwide, with the aim of contributing to better representation of aerosols and their interactions with clouds in models and, therefore, better evaluation of their impact on climate.
Jonathan E. Hickman, Niels Andela, Enrico Dammers, Lieven Clarisse, Pierre-François Coheur, Martin Van Damme, Courtney A. Di Vittorio, Money Ossohou, Corinne Galy-Lacaux, Kostas Tsigaridis, and Susanne E. Bauer
Atmos. Chem. Phys., 21, 16277–16291, https://doi.org/10.5194/acp-21-16277-2021, https://doi.org/10.5194/acp-21-16277-2021, 2021
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Ammonia (NH3) gas emitted from soils and biomass burning contributes to particulate air pollution. We used satellite observations of the atmosphere over Africa to show that declines in NH3 concentrations over South Sudan's Sudd wetland in 2008–2017 are related to variation in wetland extent. We also find NH3 concentrations increased in West Africa as a result of biomass burning and increased in the Lake Victoria region, likely due to agricultural expansion and intensification.
Cited articles
Adon, M., Galy-Lacaux, C., Yoboué, V., Delon, C., Lacaux, J. P., Castera, P., Gardrat, E., Pienaar, J., Al Ourabi, H., Laouali, D., Diop, B., Sigha-Nkamdjou, L., Akpo, A., Tathy, J. P., Lavenu, F., and Mougin, E.: Long term measurements of sulfur dioxide, nitrogen dioxide, ammonia, nitric acid and ozone in Africa using passive samplers, Atmos. Chem. Phys., 10, 7467–7487, https://doi.org/10.5194/acp-10-7467-2010, 2010.
Adon, M., Galy-Lacaux, C., Delon, C., Yoboue, V., Solmon, F., and Kaptue Tchuente, A. T.: Dry deposition of nitrogen compounds (NO2, HNO3, NH3), sulfur dioxide and ozone in west and central African ecosystems using the inferential method, Atmos. Chem. Phys., 13, 11351–11374, https://doi.org/10.5194/acp-13-11351-2013, 2013.
Balashov, N. V., Thompson, A. M., Piketh, S. J., and Langerman, K. E.:
Surface ozone variability and trends over the South African Highveld from
1990 to 2007, J. Geophys. Res.-Atmos., 119, 4323–4342, https://doi.org/10.1002/2013JD020555,
2014.
Bencherif, H., Diab, R. D., Portafaix, T., Morel, B., Keckhut, P., and Moorgawa, A.: Temperature climatology and trend estimates in the UTLS region as observed over a southern subtropical site, Durban, South Africa, Atmos. Chem. Phys., 6, 5121–5128, https://doi.org/10.5194/acp-6-5121-2006, 2006.
Booyens, W., Beukes, J. P., Van Zyl, P. G., Ruiz-Jimenez, J., Kopperi, M.,
Riekkola, M.-L., Josipovic, M., Vakkari, V., and Laakso, L.: Assessment of
polar organic aerosols at a regional background site in southern Africa, J.
Atmos. Chem., 76, 89–113, https://doi.org/10.1007/s10874-019-09389-y, 2019.
Bytnerowicz, A., Tausz, M., Alonso, R., Jones, D., Johnson, R., and Grulke,
N.: Summer-time distribution of air pollutants in Sequoia National Park,
California, Environ. Pollut., 118, 187–203, https://doi.org/10.1016/S0269-7491(01)00312-8, 2002.
Carmichael, G. R., Ferm, M., Thongboonchoo, N., Woo, J.-H., Chan, L. Y.,
Murano, K., Viet, P. H., Mossberg, C., Bala, R., Boonjawat, J., Upatum, P.,
Mohan, M., Adhikary, S. P., Shrestha, A. B., Pienaar, J. J., Brunke, E. B.,
Chen, T., Jie, T., Guoan, D., Peng, L. C., Dhiharto, S., Harjanto, H., Jose,
A. M., Kimani, W., Kirouane, A., Lacaux, J.-P., Richard, S., Barturen, O.,
Cerda, J. C., Athayde, A., Tavares, T., Cotrina, J. S., and Bilici, E.:
Measurements of sulfur dioxide, ozone and ammonia concentrations in Asia,
Africa, and South America using passive samplers, Atmos. Environ., 37,
1293–1308, https://doi.org/10.1016/S1352-2310(02)01009-9, 2003.
Connell, D. W.: Basic concepts of environmental chemistry, CRC Press, Boca Raton, Florida, USA, 2005.
Conradie, E. H., Van Zyl, P. G., Pienaar, J. J., Beukes, J. P., Galy-Lacaux,
C., Venter, A. D., and Mkhatshwa, G. V.: The chemical composition and fluxes
of atmospheric wet deposition at four sites in South Africa, Atmos.
Environ., 146, 113–131, https://doi.org/10.1016/j.atmosenv.2016.07.033, 2016.
Dhammapala, R. S.: Use of diffusive samplers for the sampling of atmospheric
pollutants, MSc, Potchefstroom University for CHE, Potchefstroom, South Africa, 1996.
Draxler, R. R. and Hess, G. D.: Description of the HYSPLIT_4
modelling system, 7th Edn., Silver Spring, Maryland: Air Resources Laboratory,
2014.
Ferm, M.: A Sensitive Diffusional Sampler, IVL Report L91, Göteborg,
Sweden: Swedish Environmental Research Institute, 1991.
Fowler, D., Pilegaard, K., Sutton, M. A., Ambus, P., Raivonen, M., Duyzer,
J., Simpson, D., Fagerli, H., Fuzzi, S., Schjoerring, J. K., Granier, C.,
Neftel, A., Isaksen, I. S. A., Laj, P., Maione, M., Monks, P. S., Burkhardt,
J., Daemmgen, U., Neirynck, J., Personne, E., Wichink-Kruit, R.,
Butterbach-Bahl, K., Flechard, C., Tuovinen, J. P., Coyle, M., Gerosa, G.,
Loubet, B., Altimir, N., Gruenhage, L., Ammann, C., Cieslik, S., Paoletti,
E., Mikkelsen, T. N., Ro-Poulsen, H., Cellier, P., Cape, J. N., Horváth,
L., Loreto, F., Niinemets, Ü., Palmer, P. I., Rinne, J., Misztal, P.,
Nemitz, E., Nilsson, D., Pryor, S., Gallagher, M. W., Vesala, T., Skiba, U.,
Brüggemann, N., Zechmeister-Boltenstern, S., Williams, J., O'Dowd, C.,
Facchini, M. C., De Leeuw, G., Flossman, A., Chaumerliac, N., and Erisman,
J. W.: Atmospheric composition change: Ecosystems–Atmosphere interactions,
Atmos. Environ., 43, 5193–5267, https://doi.org/10.1016/j.atmosenv.2009.07.068, 2009.
Garstang, M., Tyson, P. D., Swap, R., Edwards, M., Kållberg, P., and
Lindesay, J. A.: Horizontal and vertical transport of air over southern
Africa, J. Geophys. Res.-Atmos., 101, 23721–23736, https://doi.org/10.1029/95JD00844, 1996.
Gierens, R. T., Henriksson, S., Josipovic, M., Vakkari, V., Van Zyl, P. G.,
Beukes, J. P., Wood, C. R., and O'Connor, E. J.: Observing continental
boundary-layer structure and evolution over the South African savannah using
a ceilometer, Theor. Appl. Climatol., 136, 333–346,
https://doi.org/10.1007/s00704-018-2484-7, 2019.
He, J. and Bala, R.: Draft Report on passive sampler inter-comparison under
Malé declaration. Malé Declaration on Control and Prevention of Air
Pollution and its Likely Transboundary Effect for South Asia,
National University of Singapore, Singapore, 2008.
Hewitson, B. C. and Crane, R. G.: Consensus between GCM climate change
projections with empirical downscaling: precipitation downscaling over South
Africa, Int. J. Climatol., 26, 1315–1337, https://doi.org/10.1002/joc.1314, 2006.
ICDA (International Chromium Development Association): High carbon
charge grade ferrochromium Statistics. Statistical Bulletin 2012, International Chromium Development Association, Paris,
France, 2012.
ICDA: Statistical Bulletin 2013 (based on 2012 data), International
Chromium Development Association, 2013.
Inglesi-Lotz, R. and Blignaut, J.: Estimating the price elasticity for
demand for electricity by sector in South Africa, S. Afr. J. Econ. Manag.
S., 14, 449–465, https://doi.org/10.4102/sajems.v14i4.134,
2011.
International Energy Agency: Data and statistics, available at:
https://www.iea.org/data-and-statistics/data-tables?country=SOUTHAFRIC, last access: 14 May 2020.
ISO: ISO Survey, available at: http://www.iso.org/iso/iso-survey (last access: 23
January 2017), 2015.
Jaars, K., Beukes, J. P., van Zyl, P. G., Venter, A. D., Josipovic, M., Pienaar, J. J., Vakkari, V., Aaltonen, H., Laakso, H., Kulmala, M., Tiitta, P., Guenther, A., Hellén, H., Laakso, L., and Hakola, H.: Ambient aromatic hydrocarbon measurements at Welgegund, South Africa, Atmos. Chem. Phys., 14, 7075–7089, https://doi.org/10.5194/acp-14-7075-2014, 2014.
Josipovic, M., Annegarn, H. J., Kneen, M. A., Pienaar, J. J., and Piketh, S.
J.: Atmospheric dry and wet deposition of sulphur and nitrogen species and
assessment of critical loads of acidic deposition exceedance in South
Africa, S. Afr. J. Sci., 107, 1–10, https://doi.org/10.4102/sajs.v107i3/4.478, 2011.
Kaufman, Y. J., Ichoku, C., Giglio, L., Korontzi, S., Chu, D. A., Hao, W.
M., Li, R. R., and Justice, C. O.: Fire and smoke observed from the Earth
Observing System MODIS instrument – products, validation, and operational
use, Int. J. Remote Sens., 24, 1765–1781, https://doi.org/10.1080/01431160210144741,
2003.
Kleynhans, E., Beukes, J. P., Van Zyl, P. G., Bunt, J., Nkosi, N., and
Venter, M.: The Effect of Carbonaceous Reductant Selection on Chromite
Pre-reduction, Metall. Mater. Trans. B, 48, 827–840, https://doi.org/10.1007/s11663-016-0878-4, 2017.
KMNI: Monthly DMI HadISST1, available at:
http://climexp.knmi.nl/getindices.cgi?WMO=UKMOData/hadisst1_dmi&STATION=DMI_HadISST1&TYPE=i&id=someone@somewhere, last access: 22 December 2016a.
KMNI: Monthly measured total solar irradiance, available at:
http://climexp.knmi.nl/getindices.cgi?WMO=PMODData/tsi&STATION=measured_total_solar_irradiance&TYPE=i&id=someone@somewhere, last access: 22 December
2016b.
Korhonen, K., Giannakaki, E., Mielonen, T., Pfüller, A., Laakso, L., Vakkari, V., Baars, H., Engelmann, R., Beukes, J. P., Van Zyl, P. G., Ramandh, A., Ntsangwane, L., Josipovic, M., Tiitta, P., Fourie, G., Ngwana, I., Chiloane, K., and Komppula, M.: Atmospheric boundary layer top height in South Africa: measurements with lidar and radiosonde compared to three atmospheric models, Atmos. Chem. Phys., 14, 4263–4278, https://doi.org/10.5194/acp-14-4263-2014, 2014.
Kraha, A., Turner, H., Nimon, K., Reichwein Zientek, L., and Henson, R. K.:
Tools to support interpreting multiple regression in the face of
multicollinearity, Front. Psychol., 3, 1–16, https://doi.org/10.3389/fpsyg.2012.00044,
2012.
Laakso, L., Vakkari, V., Virkkula, A., Laakso, H., Backman, J., Kulmala, M., Beukes, J. P., van Zyl, P. G., Tiitta, P., Josipovic, M., Pienaar, J. J., Chiloane, K., Gilardoni, S., Vignati, E., Wiedensohler, A., Tuch, T., Birmili, W., Piketh, S., Collett, K., Fourie, G. D., Komppula, M., Lihavainen, H., de Leeuw, G., and Kerminen, V.-M.: South African EUCAARI measurements: seasonal variation of trace gases and aerosol optical properties, Atmos. Chem. Phys., 12, 1847–1864, https://doi.org/10.5194/acp-12-1847-2012, 2012.
Laban, T. L., van Zyl, P. G., Beukes, J. P., Vakkari, V., Jaars, K., Borduas-Dedekind, N., Josipovic, M., Thompson, A. M., Kulmala, M., and Laakso, L.: Seasonal influences on surface ozone variability in continental South Africa and implications for air quality, Atmos. Chem. Phys., 18, 15491–15514, https://doi.org/10.5194/acp-18-15491-2018, 2018.
Lacaux, J. P., Tathy, J. P., and Sigha, L.: Acid wet deposition in the
tropics: Two case studies using DEBITS measurements, IGACtivities Newsletter
of the International Global Atmospheric Chemistry Project, The IGAC Core Project Office, Durham, New Hampshire, USA, 2003.
Lorenzo-Seva, U., Ferrando, P. J., and Chico, E.: Two SPSS programs for
interpreting multiple regression results, Behav. Res. Methods, 42, 29–35,
https://doi.org/10.3758/BRM.42.1.29, 2010.
Lourens, A. S., Beukes, J. P., Van Zyl, P. G., Fourie, G. D., Burger, J. W.,
Pienaar, J. J., Read, C. E., and Jordaan, J. H.: Spatial and temporal
assessment of gaseous pollutants in the Highveld of South Africa, S. Afr. J.
Sci., 107, 1–8, https://doi.org/10.4102/sajs.v107i1/2.269, 2011.
Maritz, P., Beukes, J. P., Van Zyl, P. G., Liousse, C., Gardrat, E., Ramandh,
A., and Mkhatshwa, G. V.: Temporal and source assessments of organic and
elemental carbon at sites in the northern South African interior, J. Atmos.
Chem., 76, 263–287, https://doi.org/10.1007/s10874-020-09398-2, 2019.
Marshall, G.: An observation-based Southern Hemisphere Annular Mode Index, United Kingdom, available at:
http://www.nerc-bas.ac.uk/icd/gjma/sam.html, last access: 28 August 2018.
Martins, J. J., Dhammapala, R. S., Lachmann, G., Galy-Lacaux, C., and
Pienaar, J. J.: Long-term measurements of sulphur dioxide, nitrogen dioxide,
ammonia, nitric acid and ozone in southern Africa using passive samplers, S.
Afr. J. Sci., 103, 336–342, 2007.
Meng, Z.-Y., Xu, X.-B., Wang, T., Zhang, X.-Y., Yu, X.-L., Wang, S.-F., Lin,
W.-L., Chen, Y.-Z., Jiang, Y.-A., and An, X.-Q.: Ambient sulfur dioxide,
nitrogen dioxide, and ammonia at ten background and rural sites in China
during 2007–2008, Atmos. Environ., 44, 2625–2631, https://doi.org/10.1016/j.atmosenv.2010.04.008, 2010.
Meth, O.: New satellite data reveals the world's largest air pollution
hotspot is Mpumalanga – South Africa, available at:
https://www.greenpeace.org/africa/en/press/4202/new-satellite-data-reveals-the-worlds-largest-air-pollution-hotspot-is-mpumalanga-south-africa/
(last access: 17 January 2019), 2018.
Monks, P. S., Granier, C., Fuzzi, S., Stohl, A., Williams, M. L., Akimoto,
H., Amann, M., Baklanov, A., Baltensperger, U., Bey, I., Blake, N., Blake,
R. S., Carslaw, K., Cooper, O. R., Dentener, F., Fowler, D., Fragkou, E.,
Frost, G. J., Generoso, S., Ginoux, P., Grewe, V., Guenther, A., Hansson, H.
C., Henne, S., Hjorth, J., Hofzumahaus, A., Huntrieser, H., Isaksen, I. S.
A., Jenkin, M. E., Kaiser, J., Kanakidou, M., Klimont, Z., Kulmala, M., Laj,
P., Lawrence, M. G., Lee, J. D., Liousse, C., Maione, M., Mcfiggans, G.,
Metzger, A., Mieville, A., Moussiopoulos, N., Orlando, J. J., O'dowd, C. D.,
Palmer, P. I., Parrish, D. D., Petzold, A., Platt, U., Pöschl, U.,
Prévôt, A. S. H., Reeves, C. E., Reimann, S., Rudich, Y., Sellegri,
K., Steinbrecher, R., Simpson, D., Ten Brink, H., Theloke, J., Van Der Werf,
G. R., Vautard, R., Vestreng, V., Vlachokostas, C., and Von Glasow, R.:
Atmospheric composition change – global and regional air quality, Atmos.
Environ., 43, 5268–5350, https://doi.org/10.1016/j.atmosenv.2009.08.021, 2009.
Mphepya, J. N., Pienaar, J. J., Galy-Lacaux, C., Held, G., and Turner, C.
R.: Precipitation Chemistry in Semi-Arid Areas of Southern Africa: A Case
Study of a Rural and an Industrial Site, J. Atmos. Chem., 47, 1–24, https://doi.org/10.1023/B:JOCH.0000012240.09119.c4, 2004.
Mphepya, J. N., Galy-Lacaux, C., Lacaux, J. P., Held, G., and Pienaar, J.
J.: Precipitation Chemistry and Wet Deposition in Kruger National Park,
South Africa, J. Atmos. Chem., 53, 169–183, https://doi.org/10.1007/s10874-005-9005-7,
2006.
Nathans, L. L., Oswald, F. L., and Nimon, K.: Interpreting Multiple Linear
Regression: A Guidebook of Variable Importance, Pract. Assess. Res.
Evaluation, 17, 1–19, 2012.
NOAA: Climate Indices: Monthly Atmospheric and Ocean Time Series, available at: https://www.esrl.noaa.gov/psd/data/climateindices/list/ (last access:
22 December 2016), 2015a.
NOAA: Monthly Atmospheric and SST Indices, available at:
http://www.cpc.ncep.noaa.gov/data/indices/ (last access: 22 December 2016),
2015b.
Rorich, R. P. and Galpin, J. S.: Air quality in the Mpumalanga Highveld
region, South Africa, S. Afr. J. Sci., 94, 109–114, 1998.
Sheskin, D. J.: Handbook of Parametric and Nonparametric Statistical
Procedures, Boca Raton, Chapman and Hall/CRC Press, 2003.
Statistics South Africa: National Accounts: Energy Accounts for South Africa: 2002–2009, Pretoria, Statistics South Africa, 2012.
Swartz, J.-S., Van Zyl, P. G., Beukes, J. P., Labuschagne, C., Brunke, E.-G.,
Portafaix, T., Galy-Lacaux, C., and Pienaar, J. J.: Twenty-one years of
passive sampling monitoring of SO2, NO2 and O3 at the Cape
Point GAW station, South Africa, Atmos. Environ., 222, 117128,
https://doi.org/10.1016/j.atmosenv.2019.117128, 2020.
Tiitta, P., Vakkari, V., Croteau, P., Beukes, J. P., van Zyl, P. G., Josipovic, M., Venter, A. D., Jaars, K., Pienaar, J. J., Ng, N. L., Canagaratna, M. R., Jayne, J. T., Kerminen, V.-M., Kokkola, H., Kulmala, M., Laaksonen, A., Worsnop, D. R., and Laakso, L.: Chemical composition, main sources and temporal variability of PM1 aerosols in southern African grassland, Atmos. Chem. Phys., 14, 1909–1927, https://doi.org/10.5194/acp-14-1909-2014, 2014.
Toihir, A. M., Portafaix, T., Sivakumar, V., Bencherif, H., Pazmiño, A., and Bègue, N.: Variability and trend in ozone over the southern tropics and subtropics, Ann. Geophys., 36, 381–404, https://doi.org/10.5194/angeo-36-381-2018, 2018.
Tyson, P. D., Garstang, M., and Swap, R.: Large-Scale Recirculation of Air
over Southern Africa, J. Appl. Meteorol., 35, 18, https://doi.org/10.1175/1520-0450(1996)035<2218:LSROAO>2.0.CO;2, 1996.
Vet, R., Artz, R. S., Carou, S., Shaw, M., Ro, C.-U., Aas, W., Baker, A.,
Bowersox, V. C., Dentener, F., Galy-Lacaux, C., Hou, A., Pienaar, J. J.,
Gillett, R., Forti, M. C., Gromov, S., Hara, H., Khodzher, T., Mahowald, N.
M., Nickovic, S., Rao, P. S. P., and Reid, N. W.: A global assessment of
precipitation chemistry and deposition of sulfur, nitrogen, sea salt, base
cations, organic acids, acidity and pH, and phosphorus, Atmos. Environ., 93,
3–100, https://doi.org/10.1016/j.atmosenv.2013.10.060, 2014.
Westcott, G., Tacke, M., Schoeman, N., and Morgan, N.: Impala Platinum
Smelter, Rustenburg: An integrated smelter off-gas treatment solution, J. S.
Afr. I. Min. Metall., 107, 281–287, 2007.
World Bank: Data, available at:
https://data.worldbank.org/country/south-africa (last access: 15 May 2020),
2019.
Short summary
Statistical modelling of interdependencies between local, regional and global parameters on long-term trends of atmospheric SO2, NO2 and O2 within proximity of the pollution hotspot in South Africa indicated that changes in meteorological conditions and/or variances in source influences contributed to temporal variability. The impact of increased anthropogenic activities and energy demand was evident, while the El Niño–Southern Oscillation made a significant contribution to O3 levels.
Statistical modelling of interdependencies between local, regional and global parameters on...
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