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Oram, D. E., Mani, F. S., Laube, J. C., Newland, M. J., Reeves, C. E. 
ORCID: https://orcid.org/0000-0003-4071-1926, Sturges, W. T. ORCID: https://orcid.org/0000-0002-9044-7169, Penkett, S. A., Brenninkmeijer, C. A. M., Röckmann, T. and Fraser, P. J.
(2011)
Long-term tropospheric trend of octafluorocyclobutane (c-C4F8 or PFC-318).
pp. 19089-19111.
Abstract
Air samples collected at Cape Grim, Tasmania between 1978 and 2008 and during a series of more recent aircraft sampling programmes have been analysed to determine the atmospheric abundance and trend of octafluorocyclobutane (c-C4F8 or PFC-318). c-C4F8 has an atmospheric lifetime in excess of 3000 yr and a global warming potential (GWP) of 10 300 (100 yr time horizon), making it one of the most potent greenhouse gases detected in the atmosphere to date. The abundance of c-C4F 8 in the Southern Hemisphere has risen from 0.35 ppt in 1978 to 1.2 ppt in 2010, and is currently increasing at a rate of around 0.03 ppt yr -1. It is the third most abundant perfluorocarbon (PFC) in the present day atmosphere, behind CF4 (~75 ppt) and C 2F6 (~4 ppt). The origin of c-C4F 8 is unclear. Using a 2-D global model to derive top-down global emissions based on the Cape Grim measurements yields a recent (2007) emission rate of around 1.1 Gg yr-1 and a cumulative emission up to and including 2007 of 38.1 Gg. Emissions reported on the EDGAR emissions database for the period 1986-2005 represent less than 1 % of the top-down emissions for the same period, which suggests there is a large unaccounted for source of this compound. It is also apparent that the magnitude of this source has varied considerably over the past 30 yr, declining sharply in the late 1980s before increasing again in the mid-1990s.
| Item Type: | Article |
|---|---|
| Faculty \ School: | Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Atmospheric Chemistry (former - to 2018) Faculty of Science > Research Groups > Climate, Ocean and Atmospheric Sciences (former - to 2017) Faculty of Science > Research Groups > Marine and Atmospheric Sciences (former - to 2017) |
| Depositing User: | Rosie Cullington |
| Date Deposited: | 28 Jul 2011 09:38 |
| Last Modified: | 14 Sep 2023 14:30 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/34295 |
| DOI: | 10.5194/acpd-11-19089-2011 |
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