Measurement report: Long-term measurements of surface ozone and trends in semi-natural sub-Saharan African ecosystems
<p>For nearly 30 years, the International Network to study Deposition and Atmospheric chemistry in AFrica (INDAAF) programme has measured surface ozone from 14 sites in Africa representative of the main African ecosystems: dry savannas (Banizoumbou, Niger; Katibougou and Agoufou, Mali; Bambey...
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Copernicus Publications
2024-11-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/24/13151/2024/acp-24-13151-2024.pdf |
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| author | H. E. V. Donnou A. B. Akpo M. Ossohou M. Ossohou C. Delon V. Yoboué D. Laouali M. Ouafo-Leumbe P. G. Van Zyl O. Ndiaye E. Gardrat M. Dias-Alves C. Galy-Lacaux |
| author_facet | H. E. V. Donnou A. B. Akpo M. Ossohou M. Ossohou C. Delon V. Yoboué D. Laouali M. Ouafo-Leumbe P. G. Van Zyl O. Ndiaye E. Gardrat M. Dias-Alves C. Galy-Lacaux |
| author_sort | H. E. V. Donnou |
| collection | DOAJ |
| description | <p>For nearly 30 years, the International Network to study Deposition and Atmospheric chemistry in AFrica (INDAAF) programme has measured surface ozone from 14 sites in Africa representative of the main African ecosystems: dry savannas (Banizoumbou, Niger; Katibougou and Agoufou, Mali; Bambey and Dahra, Senegal), wet savannas (Lamto, Côte d'Ivoire; Djougou, Benin), forests (Zoétélé, Cameroon; Bomassa, Republic of the Congo) and agricultural–semi-arid savannas (Mbita, Kenya; Louis Trichardt, Amersfoort, Skukuza and Cape Point, South Africa). The data are collected with passive samplers and archived as monthly averages; quality assurance is maintained by INDAAF's calibration and intercomparison protocols with other programmes employing the same systems. This analysis reports on correlations of INDAAF ozone time series (1995–2020) with local meteorological parameters and with ozone precursors, biogenic volatile organic compounds (BVOCs) and nitrogen oxides (NO<span class="inline-formula"><sub><i>x</i></sub></span>), derived from standard global databases. Mean annual averages of surface ozone range from 3.9 <span class="inline-formula">±</span> 1.1 ppb (Bomassa) to 30.8 <span class="inline-formula">±</span> 8.0 ppb (Louis Trichardt), reflecting a general positive gradient from west central Africa to South Africa. At the decade scale, from 2000 to 2020, the Katibougou and Banizoumbou sites (dry savanna) experienced a significant decrease in ozone of around <span class="inline-formula">−</span>2.4 and <span class="inline-formula">−</span>0.8 ppb per decade, respectively. These decreasing trends are consistent with those observed for nitrogen dioxide (NO<span class="inline-formula"><sub>2</sub></span>) and BVOCs. An increasing trend is observed in Zoétélé (2001–2020), estimated at <span class="inline-formula">+</span>0.7 ppb per decade, and at Skukuza (2000–2015; <span class="inline-formula">+</span>3.4 ppb per decade). The increasing trends are consistent with increasing biogenic emissions at Zoétélé and NO<span class="inline-formula"><sub>2</sub></span> levels at Skukuza. Very few surface O<span class="inline-formula"><sub>3</sub></span> measurements exist in Africa, and the long-term results presented in this study are the most extensive for the ecosystems studied. The importance of maintaining long-term observations like INDAAF cannot be overstated. The data can be used to assess ozone<span id="page13152"/> impacts on African crops. For the Tropospheric Ozone Assessment Report Phase II (TOAR II), they provide invaluable constraints for models of chemical and climate processes in the atmosphere.</p> |
| format | Article |
| id | doaj-art-e4f29d531437476c847474ccf5d4d83a |
| institution | OA Journals |
| issn | 1680-7316 1680-7324 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Copernicus Publications |
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| series | Atmospheric Chemistry and Physics |
| spelling | doaj-art-e4f29d531437476c847474ccf5d4d83a2025-08-20T02:07:02ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242024-11-0124131511318210.5194/acp-24-13151-2024Measurement report: Long-term measurements of surface ozone and trends in semi-natural sub-Saharan African ecosystemsH. E. V. Donnou0A. B. Akpo1M. Ossohou2M. Ossohou3C. Delon4V. Yoboué5D. Laouali6M. Ouafo-Leumbe7P. G. Van Zyl8O. Ndiaye9E. Gardrat10M. Dias-Alves11C. Galy-Lacaux12Laboratoire de Physique du Rayonnement, Faculté des Sciences et Techniques, Université d'Abomey-Calavi, Cotonou, 01 B.P. 526, BeninLaboratoire de Physique du Rayonnement, Faculté des Sciences et Techniques, Université d'Abomey-Calavi, Cotonou, 01 B.P. 526, BeninDepartment of Physics, University of Man, Man, Côte d'IvoireLaboratoire des Sciences de la Matière, de l'Environnement et de l'Energie Solaire, Université Félix Houphouët-Boigny, Abidjan, Côte d'IvoireLaboratoire d'Aérologie, Université Toulouse III – Paul Sabatier, CNRS, Toulouse, 31400, FranceLaboratoire des Sciences de la Matière, de l'Environnement et de l'Energie Solaire, Université Félix Houphouët-Boigny, Abidjan, Côte d'IvoireLaboratoire de Climat-Environnement et Matériaux-Rayonnement, Faculté des Sciences et Techniques, Université Abdou Moumouni, Niamey, BP 10662, NigerDepartment of Earth Sciences, Faculty of Sciences, University of Douala, Douala, P.O. Box 2701, CameroonAtmospheric Chemistry Research Group, Chemical Resource Beneficiation, North-West University, Potchefstroom, 2520, South AfricaCentre de Recherches Zootechniques de Dahra, Institut Sénégalais de Recherches Agricoles, Dahra, SenegalLaboratoire d'Aérologie, Université Toulouse III – Paul Sabatier, CNRS, Toulouse, 31400, FranceLaboratoire d'Aérologie, Université Toulouse III – Paul Sabatier, CNRS, Toulouse, 31400, FranceLaboratoire d'Aérologie, Université Toulouse III – Paul Sabatier, CNRS, Toulouse, 31400, France<p>For nearly 30 years, the International Network to study Deposition and Atmospheric chemistry in AFrica (INDAAF) programme has measured surface ozone from 14 sites in Africa representative of the main African ecosystems: dry savannas (Banizoumbou, Niger; Katibougou and Agoufou, Mali; Bambey and Dahra, Senegal), wet savannas (Lamto, Côte d'Ivoire; Djougou, Benin), forests (Zoétélé, Cameroon; Bomassa, Republic of the Congo) and agricultural–semi-arid savannas (Mbita, Kenya; Louis Trichardt, Amersfoort, Skukuza and Cape Point, South Africa). The data are collected with passive samplers and archived as monthly averages; quality assurance is maintained by INDAAF's calibration and intercomparison protocols with other programmes employing the same systems. This analysis reports on correlations of INDAAF ozone time series (1995–2020) with local meteorological parameters and with ozone precursors, biogenic volatile organic compounds (BVOCs) and nitrogen oxides (NO<span class="inline-formula"><sub><i>x</i></sub></span>), derived from standard global databases. Mean annual averages of surface ozone range from 3.9 <span class="inline-formula">±</span> 1.1 ppb (Bomassa) to 30.8 <span class="inline-formula">±</span> 8.0 ppb (Louis Trichardt), reflecting a general positive gradient from west central Africa to South Africa. At the decade scale, from 2000 to 2020, the Katibougou and Banizoumbou sites (dry savanna) experienced a significant decrease in ozone of around <span class="inline-formula">−</span>2.4 and <span class="inline-formula">−</span>0.8 ppb per decade, respectively. These decreasing trends are consistent with those observed for nitrogen dioxide (NO<span class="inline-formula"><sub>2</sub></span>) and BVOCs. An increasing trend is observed in Zoétélé (2001–2020), estimated at <span class="inline-formula">+</span>0.7 ppb per decade, and at Skukuza (2000–2015; <span class="inline-formula">+</span>3.4 ppb per decade). The increasing trends are consistent with increasing biogenic emissions at Zoétélé and NO<span class="inline-formula"><sub>2</sub></span> levels at Skukuza. Very few surface O<span class="inline-formula"><sub>3</sub></span> measurements exist in Africa, and the long-term results presented in this study are the most extensive for the ecosystems studied. The importance of maintaining long-term observations like INDAAF cannot be overstated. The data can be used to assess ozone<span id="page13152"/> impacts on African crops. For the Tropospheric Ozone Assessment Report Phase II (TOAR II), they provide invaluable constraints for models of chemical and climate processes in the atmosphere.</p>https://acp.copernicus.org/articles/24/13151/2024/acp-24-13151-2024.pdf |
| spellingShingle | H. E. V. Donnou A. B. Akpo M. Ossohou M. Ossohou C. Delon V. Yoboué D. Laouali M. Ouafo-Leumbe P. G. Van Zyl O. Ndiaye E. Gardrat M. Dias-Alves C. Galy-Lacaux Measurement report: Long-term measurements of surface ozone and trends in semi-natural sub-Saharan African ecosystems Atmospheric Chemistry and Physics |
| title | Measurement report: Long-term measurements of surface ozone and trends in semi-natural sub-Saharan African ecosystems |
| title_full | Measurement report: Long-term measurements of surface ozone and trends in semi-natural sub-Saharan African ecosystems |
| title_fullStr | Measurement report: Long-term measurements of surface ozone and trends in semi-natural sub-Saharan African ecosystems |
| title_full_unstemmed | Measurement report: Long-term measurements of surface ozone and trends in semi-natural sub-Saharan African ecosystems |
| title_short | Measurement report: Long-term measurements of surface ozone and trends in semi-natural sub-Saharan African ecosystems |
| title_sort | measurement report long term measurements of surface ozone and trends in semi natural sub saharan african ecosystems |
| url | https://acp.copernicus.org/articles/24/13151/2024/acp-24-13151-2024.pdf |
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