1. Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa
2. Atmospheric Chemistry Research Group, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
3. Climate and Environmental Research and Monitoring, South African Weather Service, Stellenbosch 7600, South Africa
4. School of Physics, Ryan Institute’s Centre for Climate and & Pollution Studies, and Marine Renewable Energy Ireland, National University of Ireland Galway, Galway H91 CF50, Ireland
5. School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, United Kingdom
6. School of Geosciences, University of Edinburgh, Edinburgh EH9 3JW, United Kingdom
7. Hadley Centre, The Met Office, Exeter EX1 3PB, United Kingdom