A decline in tropospheric organic bromine

Details A decline in tropospheric organic bromine A decline in tropospheric organic bromine

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30oas13m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 15, pp. ASC 13-1, CiteID 1826, DOI 10.1029/2003GL017745

Physics

35

Atmospheric Composition And Structure, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry

Scientific paper

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.

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