Coronavirus Information for the UC San Diego Community

Our leaders are working closely with federal and state officials to ensure your ongoing safety at the university. Stay up to date with the latest developments. Learn more.

Atmospheric histories and global emissions of halons H-1211 (CBrClF2), H-1301 (CBrF3), and H-2402 (CBrF2CBrF2)

TitleAtmospheric histories and global emissions of halons H-1211 (CBrClF2), H-1301 (CBrF3), and H-2402 (CBrF2CBrF2)
Publication TypeJournal Article
Year of Publication2016
AuthorsVollmer M.K, Mühle J, Trudinger C.M, Rigby M, Montzka SA, Harth CM, Miller B.R, Henne S., Krummel PB, Hall BD, Young D, Kim J., Arduini J., Wenger A., Yao B., Reimann S., O'Doherty S, Maione M., Etheridge D.M, Li S.L, Verdonik D.P, Park S., Dutton G., Steele LP, Lunder C.R, Rhee T.S, Hermansen O., Schmidbauer N., Wang R.HJ, Hill M., Salameh PK, Langenfelds R.L, Zhou L.X, Blunier T., Schwander J., Elkins JW, Butler J.H, Simmonds PG, Weiss RF, Prinn RG, Fraser PJ
JournalJournal of Geophysical Research-Atmospheres
Date Published2016/04
Type of ArticleArticle
ISBN Number2169-897X
Accession NumberWOS:000375120200037
Keywordsbromine; gases; growth; halocarbons; halons; in-situ; measurements; montreal protocol; ozone depletion; ozone depletion potentials; particle dispersion model; polar firn air; trends; warming potentials

We report ground-based atmospheric measurements and emission estimates for the halons H-1211 (CBrClF2), H-1301 (CBrF3), and H-2402 (CBrF2CBrF2) from the AGAGE (Advanced Global Atmospheric Gases Experiment) and the National Oceanic and Atmospheric Administration global networks. We also include results from archived air samples in canisters and from polar firn in both hemispheres, thereby deriving an atmospheric record of nearly nine decades (1930s to present). All three halons were absent from the atmosphere until approximate to 1970, when their atmospheric burdens started to increase rapidly. In recent years H-1211 and H-2402 mole fractions have been declining, but H-1301 has continued to grow. High-frequency observations show continuing emissions of H-1211 and H-1301 near most AGAGE sites. For H-2402 the only emissions detected were derived from the region surrounding the Sea of Japan/East Sea. Based on our observations, we derive global emissions using two different inversion approaches. Emissions for H-1211 declined from a peak of 11ktyr(-1) (late 1990s) to 3.9ktyr(-1) at the end of our record (mean of 2013-2015), for H-1301 from 5.4ktyr(-1) (late 1980s) to 1.6ktyr(-1), and for H-2402 from 1.8ktyr(-1) (late 1980s) to 0.38ktyr(-1). Yearly summed halon emissions have decreased substantially; nevertheless, since 2000 they have accounted for approximate to 30% of the emissions of all major anthropogenic ozone depletion substances, when weighted by ozone depletion potentials.

Student Publication: