Abstract
Tropospheric ozone can have a detrimental effect on vegetation, including reducing the quantity of crop yield. This study uses modelled ozone flux values (POD3IAM; phytotoxic ozone dose above 3 nmol m−2 s−1, parameterised for integrated assessment modelling) for 2015, together with species-specific flux-effect relationships, spatial data on production and growing season dates to quantify the impact of ozone on the production of common wheat (Triticum aestivum) and common beans (Phaseolus vulgaris) across Sub-Saharan Africa (SSA). A case study for South Africa was also done using detailed data per province. Results suggest that ozone pollution could decrease wheat yield by between 2 and 13%, with a total annual loss of 453,000 t across SSA. The impact on bean production depended on the season; however, estimated yield losses were up to 21% in some areas of SSA, with an annual loss of ~300,000 t for each of the two main growing seasons. Production losses tended to be greater in countries with the highest production, for example, Ethiopia (wheat) and Tanzania (beans). This study provides an indication of the location of areas at high risk of crop losses due to ozone. Results emphasise that efforts to reduce ozone precursors could contribute to reducing the yield gap in SSA. More stringent air pollution abatement policies are required to reduce crop losses to ozone in the future.
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Acknowledgements
The authors wish to thank Aled Williams (Aled Williams Mechatronics) for technical support for the ozone exposure solardomes facility and Dr Jacques Berner of North-West University, South Africa, for advice on finding production data for South African crops.
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The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request. Due to requirements of the NERC funding body, if requested, data would be made available via the Environmental Information Data Centre (EIDC), where data could be downloaded.
Funding
This work was funded by the UK Natural Environment Research Council (NERC), as part of the SUNRISE programme, a National Capability Long-Term Science-Official Development Assistance (LTS-ODA) project, NEC06476. This funding supported the design of the study, data collection, analysis, and interpretation of data and writing of the manuscript. Additional funding (for ongoing development of the EMEP-WRF model) was from the NERC UK-SCAPE programme delivering National Capability (NE/R016429/1), the UKRI (UK Research and Innovation) Global Challenges Research Fund (‘South Asian Nitrogen Hub’), the ‘Towards INMS’ project of the Global Environment Facility (GEF) and UNEP (United Nations Environment Programme).
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KS, FH and HH contributed to the study conception and design. Material preparation, data collection and analysis were performed by KS and FH. MM and RB ran the EMEP-WRF model, performed quality assurance/control and provided ozone flux data for further analysis/mapping by KS. The first draft of the manuscript was written by KS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Sharps, K., Vieno, M., Beck, R. et al. Quantifying the impact of ozone on crops in Sub-Saharan Africa demonstrates regional and local hotspots of production loss. Environ Sci Pollut Res 28, 62338–62352 (2021). https://doi.org/10.1007/s11356-021-14967-3
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DOI: https://doi.org/10.1007/s11356-021-14967-3