Atmospheric histories and global emissions of halons H-1211 (CBrClF 2 ), H-1301 (CBrF 3 ), and H-2402 (CBrF 2 CBrF 2 )

Vollmer, Martin K.; Mühle, Jens; Trudinger, Cathy M.; Rigby, Matthew; Montzka, Stephen A.; Harth, Christina M.; Miller, Benjamin R.; Henne, Stephan; Krummel, Paul B.; Hall, Bradley D.; Young, Dickon; Kim, Jooil; Arduini, Jgor; Wenger, Angelina; Yao, Bo; Reimann, Stefan; O'Doherty, Simon; Maione, Michela; Etheridge, David M.; Li, Shanlan; ... (2016). Atmospheric histories and global emissions of halons H-1211 (CBrClF 2 ), H-1301 (CBrF 3 ), and H-2402 (CBrF 2 CBrF 2 ). Journal of Geophysical Research: Atmospheres, 121(7), pp. 3663-3686. American Geophysical Union 10.1002/2015JD024488

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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 ~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 11 kt yr⁻¹ (late 1990s) to 3.9 kt yr⁻¹ at the end of our record (mean of 2013–2015), for H-1301 from 5.4 kt yr⁻¹ (late 1980s) to 1.6 kt yr⁻¹, and for H-2402 from 1.8 kt yr⁻¹ (late 1980s) to 0.38 kt yr⁻¹. Yearly summed halon emissions have decreased substantially; nevertheless, since 2000 they have accounted for ~30% of the emissions of all major anthropogenic ozone depletion substances, when weighted by ozone depletion potentials.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)

UniBE Contributor:

Schwander, Jakob

Subjects:

500 Science > 530 Physics

ISSN:

2169-897X

Publisher:

American Geophysical Union

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

12 Jul 2016 13:33

Last Modified:

17 Oct 2016 02:35

Publisher DOI:

10.1002/2015JD024488

BORIS DOI:

10.7892/boris.83947

URI:

https://boris.unibe.ch/id/eprint/83947

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