Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-7-1823-2007
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1823
1847
2007-02-05
Enhanced tropospheric BrO concentrations over the Antarctic sea ice belt in mid winter observed from MAX-DOAS observations on board the research vessel Polarstern
T. Wagner
thomas.wagner@iup.uni-heidelberg.de
O. Ibrahim
R. Sinreich
U. Frieß
U. Platt
Max-Planck-Institute for Chemistry, Mainz, Germany
Institut für Umweltphysik, University of Heidelberg, Heidelberg, Germany
We present Multi AXis-Differential Optical Absorption
Spectroscopy (MAX-DOAS) observations of tropospheric BrO carried out on
board the German research vessel Polarstern during the Antarctic winter
2006. Polarstern entered the area of first year sea ice around Antarctica on
24 June 2006 and stayed within this area until 15 August 2006. For the period when
the ship cruised inside the first year sea ice belt, enhanced BrO
concentrations were almost continuously observed. One interesting exception
appeared on 7 July 2006, when the sun elevation angle was < about
–2.8°
indicating that for low insulation the photolysis of Br<sub>2</sub> and/or HOBr is
too slow to provide sufficient amounts of Br radicals. Before and after the
period inside the first year sea ice belt, typically low BrO concentrations
were observed. Our observations indicate that enhanced BrO concentrations
around Antarctica exist about one month earlier than observed by satellite
instruments. The small BrO concentrations over the open oceans indicate a
short atmospheric lifetime of activated bromine without contact to areas of
first year sea ice. From detailed radiative transfer simulations we find
that MAX-DOAS observations are about one order of magnitude more sensitive
to near-surface BrO than satellite observations. In contrast to satellite
observations the MAX-DOAS sensitivity hardly decreases for large solar
zenith angles and is almost independent from the ground albedo. Thus this
technique is very well suited for observations in polar regions close to the
solar terminator. Furthermore, combination of both techniques could yield
additional information on the vertical distribution of BrO in the lower
troposphere.
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