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GEOPHYSICAL RESEARCH LETTERS,
VOL. 30,
1826,
4 PP., 2003
doi:10.1029/2003GL017745
A decline in tropospheric organic bromine
National Oceanic and Atmospheric Administration, Climate Monitoring and Diagnostics Laboratory (NOAA-CMDL), Boulder, Colorado, USA
National Oceanic and Atmospheric Administration, Climate Monitoring and Diagnostics Laboratory (NOAA-CMDL), Boulder, Colorado, USA
National Oceanic and Atmospheric Administration, Climate Monitoring and Diagnostics Laboratory (NOAA-CMDL), Boulder, Colorado, USA
Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder, Colorado, USA
National Oceanic and Atmospheric Administration, Climate Monitoring and Diagnostics Laboratory (NOAA-CMDL), Boulder, Colorado, USA
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.
Received 14 April 2003; accepted 14 July 2003; published 15 August 2003.
Citation: (2003), A decline in tropospheric organic bromine, Geophys. Res. Lett., 30(15), 1826, doi:10.1029/2003GL017745.
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