Atmospheric Chemistry and Physics Discussions
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2008
10.5194/acpd-8-12999-2008
http://www.atmos-chem-phys-discuss.net/8/12999/2008/
http://www.atmos-chem-phys-discuss.net/8/12999/2008/acpd-8-12999-2008.html
http://www.atmos-chem-phys-discuss.net/8/12999/2008/acpd-8-12999-2008.pdf
12999
13015
2008-07-09
Bromine in the tropical troposphere and stratosphere as derived from balloon-borne BrO observations
M. Dorf
marcel.dorf@iup.uni-heidelberg.de
A. Butz
C. Camy-Peyret
M. P. Chipperfield
L. Kritten
K. 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
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 (Br<sub>y</sub>)
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
Br<sub>y</sub>. 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
Br<sub>y</sub> in the lower stratosphere. Bromine source gas measurements
performed 10 days earlier (Laube et al., 2008), indicate a lower Br<sub>y</sub> of
(17.5±0.4) ppt. Potential reasons for this discrepancy are discussed.
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