Trudinger, C.M. and Fraser, P.J. and Etheridge, D.M. and Sturges, W.T. and Vollmer, M.K. and Rigby, M. and Martinerie, P. and Mühle, J. and Worton, D.R. and Krummel, P.B. and Steele, L.P. and Miller, B.R. and Laube, J.C. and Mani, Francis S. and Rayner, P.J. and Harth, C.M. and Witrant, E. and Blunier, T. and Schwander, J. and O'Dorothy, S. and Battle, M. (2016) Atmospheric abundance and global emissions of perfluorocarbons CF4, C2F6 and C3F8 since 1800 inferred from ice core, firn, air archive and in situ measurements. Atmospheric Chemistry and Physics, 16 . pp. 11733-11754. ISSN 1680-7316
Preview |
PDF
- Published Version
Available under License Creative Commons Attribution. Download (671kB) | Preview |
Abstract
Perfluorocarbons (PFCs) are very potent and longlived
greenhouse gases in the atmosphere, released predominantly
during aluminium production and semiconductor
manufacture. They have been targeted for emission controls
under the United Nations Framework Convention on Climate
Change. Here we present the first continuous records of the
atmospheric abundance of CF4 (PFC-14), C2F6 (PFC-116)
and C3F8 (PFC-218) from 1800 to 2014. The records are derived from high-precision measurements of PFCs in air extracted from polar firn or ice at six sites (DE08, DE08-2,
DSSW20K, EDML, NEEM and South Pole) and air archive
tanks and atmospheric air sampled from both hemispheres.
We take account of the age characteristics of the firn and
ice core air samples and demonstrate excellent consistency
between the ice core, firn and atmospheric measurements.
We present an inversion for global emissions from 1900 to
2014. We also formulate the inversion to directly infer emission factors for PFC emissions due to aluminium production prior to the 1980s. We show that 19th century atmospheric levels, before significant anthropogenic influence, were stable at 34:1�0:3 ppt for CF4 and below detection limits of 0.002 and 0.01 ppt for C2F6 and C3F8, respectively. We find a significant peak in CF4 and C2F6 emissions around 1940, most likely due to the high demand for aluminium during World War II, for example for construction of aircraft, but these emissions were nevertheless much lower than in recent years. The PFC emission factors for aluminium production
in the early 20th century were significantly higher than today but have decreased since then due to improvements and better control of the smelting process. Mitigation efforts have led to decreases in emissions from peaks in 1980 (CF4) or early-to-mid-2000s (C2F6 and C3F8) despite the continued
increase in global aluminium production; however, these decreases in emissions appear to have recently halted. We see a temporary reduction of around 15% in CF4 emissions in
2009, presumably associated with the impact of the global
financial crisis on aluminium and semiconductor production.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences |
| Depositing User: | Francis Mani |
| Date Deposited: | 14 Feb 2017 02:18 |
| Last Modified: | 14 Feb 2017 02:20 |
| URI: | https://repository.usp.ac.fj/id/eprint/9596 |
Actions (login required)
 |
View Item |