References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-7265-2008

Bromine in the tropical troposphere and stratosphere as derived from balloon-borne BrO observations

Dorf

¹ Butz

² Camy-Peyret

³ Chipperfield

M. P.

⁴ Kritten

¹ Pfeilsticker

Institut für Umweltphysik (IUP), University of Heidelberg, Heidelberg, Germany

SRON–Netherlands Institute for Space Research, Utrecht, The Netherlands

Laboratoire de Physique Moléculaire pour l'Atmosphère et l'Astrophysique (LPMAA), Université Pierre et Marie Curie, Paris, France

Institute for Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK

10 12 2008

8 23 7265 7271

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/8/7265/2008/acp-8-7265-2008.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/7265/2008/acp-8-7265-2008.pdf

The first tropospheric and stratospheric (4 to 33 km) BrO profile is presented for the inner tropics derived from balloon-borne DOAS (Differential Optical Absorption Spectroscopy) measurements. In combination with photochemical modelling, total stratospheric inorganic bromine (Bry) is deduced to be (21.5±2.5) ppt in 4.5-year-old air, probed in 2005. We derive a total contribution of (5.2±2.5) ppt from brominated very short-lived substances and inorganic product gases to stratospheric Bry Tropospheric BrO was found to be <1 ppt. Our results are compared to two 3-D CTM SLIMCAT model runs, which differ in the lifetime of the bromine source gases, affecting the vertical distribution of Bry in the lower stratosphere. Bromine source gas measurements performed 10 days earlier Laube et al., 2008, indicate a lower Bry of (17.5±0.4) ppt. Potential reasons for this discrepancy are discussed.

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