A decline in tropospheric organic bromine
Article first published online: 15 AUG 2003
Copyright 2003 by the American Geophysical Union.
Geophysical Research Letters
Volume 30, Issue 15, August 2003
How to Cite
2003), A decline in tropospheric organic bromine, Geophys. Res. Lett., 30, 1826, doi:10.1029/2003GL017745, 15., , , , and (
- Issue published online: 15 AUG 2003
- Article first published online: 15 AUG 2003
- Manuscript Accepted: 14 JUL 2003
- Manuscript Revised: 26 JUN 2003
- Manuscript Received: 14 APR 2003
 Recent changes in atmospheric bromine (Br) are estimated from samples collected at ten globally distributed, ground-based sites. The results indicate that the global tropospheric burden of Br from the sum of halons and methyl bromide (CH3Br) peaked in 1998 and has since declined by nearly 5% (or 0.8 ± 0.2 pmol mol−1 or ppt). These changes are driven primarily by a decrease of CH3Br since 1998 that is about two times larger than expected given reported declines in industrial production, a result that may suggest revisions to our understanding of the global atmospheric budget for this gas. The observations imply 25–30% larger declines in the atmospheric burden of ozone-depleting, total equivalent chlorine (ECl = Cl + Br*45) in recent years than noted previously.