Article Cite This: Environ. Sci. Technol. XXXX, XXX, XXX−XXX
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Atmospheric HCFC-22, HFC-125, and HFC-152a at Cape Point, South Africa Brett Kuyper,† Daniel Say,‡ Casper Labuschagne,§ Timothy Lesch,† Warren R. Joubert,§ Damien Martin,‡,# Dickon Young,‡ M. Anwar H. Khan,‡ Matthew Rigby,‡ Anita L. Ganesan,∥ Mark F. Lunt,⊥ Colin O’Dowd,# Alistair J. Manning,‡,∇ Simon O’Doherty,‡ Michael T. Davies-Coleman,† and Dudley E. Shallcross*,†,‡ †
Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa Atmospheric Chemistry Research Group, School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom § Climate and Environmental Research and Monitoring, South African Weather Service, Stellenbosch 7600, South Africa ∥ School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, United Kingdom ⊥ School of Geosciences, University of Edinburgh, Edinburgh EH9 3JW, United Kingdom # 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 ∇ Hadley Centre, The Met Office, Exeter EX1 3PB, United Kingdom
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S Supporting Information *
ABSTRACT: One hydrochlorofluorocarbon and two hydrofluorocarbons (HCFC-22, HFC-125, and HFC-152a) were measured in air samples at the Cape Point observatory (CPT), South Africa, during 2017. These data represent the first such atmospheric measurements of these compounds from southwestern South Africa (SWSA). Baseline atmospheric growth rates were estimated to be 8.36, 4.10, and 0.71 ppt year−1 for HCFC-22, HFC-125, and HFC-152a, respectively. The CPT measurements were combined with an inverse model to investigate emissions from SWSA. For all three halocarbons, Cape Town was found to be the dominant source within SWSA. These estimates were extrapolated, based on population statistics, to estimate emissions for the whole of South Africa. We estimate South Africa’s 2017 emissions to be 3.0 (1.6−4.4), 0.8 (0.5−1.2), and 1.1 (0.6−1.6) Gg year−1 for HCFC-22, HFC-125, and HFC-152a, respectively. For all three halocarbons, South Africa’s contribution to global emissions is small (
