Evidence of continuing methylchloroform emissions from the United States
Article first published online: 1 SEP 2004
Copyright 2004 by the American Geophysical Union.
Geophysical Research Letters
Volume 31, Issue 17, September 2004
How to Cite
2004), Evidence of continuing methylchloroform emissions from the United States, Geophys. Res. Lett., 31, L17101, doi:10.1029/2004GL020166., and (
- Issue published online: 1 SEP 2004
- Article first published online: 1 SEP 2004
- Manuscript Accepted: 6 AUG 2004
- Manuscript Revised: 1 AUG 2004
- Manuscript Received: 2 APR 2004
Vol. 31, Issue 24, Article first published online: 30 DEC 2004
 We present measurements from three sites during 2001–2002 showing that methylchloroform emissions have continued in the U.S., despite the 1996 production ban under the Montreal Protocol. Available data from urban regions, if representative, suggest that 1997–2002 U.S. emissions declined exponentially from 18.5 to 3.0 Gg/yr. F-11 also showed evidence of ongoing emissions, whereas F-113 emissions have effectively ceased. Continuous in-situ measurements in urban regions provide an effective means of detecting ongoing emissions of banned compounds. Neglecting continuing emissions causes underestimates in tropospheric OH abundance derived from methylchloroform concentrations.