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| Titel |
Diurnal variations of BrONO2 observed by MIPAS-B in the Arctic and at mid-latitudes |
| VerfasserIn |
Gerald Wetzel, Hermann Oelhaf, Felix Friedl-Vallon, Andreas Ebersoldt, Thomas Gulde, Michael Höpfner, Sebastian Kazarski, Oliver Kirner, Anne Kleinert, Guido Maucher, Hans Nordmeyer, Johannes Orphal, Roland Ruhnke, Björn-Martin Sinnhuber |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250102245
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| Publikation (Nr.) |
 EGU/EGU2015-1552.pdf |
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| Zusammenfassung |
| Despite being much less abundant, the contribution of bromine to stratospheric ozone
depletion is similar to that of chlorine. Moreover, against the background of abating levels
of chlorine in the stratosphere, bromine will become more and more important
due to its natural sources. The two major inorganic bromine species in the lower
stratosphere are bromine oxide (BrO) and bromine nitrate (BrONO2) - the relative
abundances of which are mainly controlled by photochemical processes. While
BrO has first been observed around 20 years ago, BrONO2 has been detected by
satellite limb observations in the mid-infrared spectral region only recently (in
2008).
Two Arctic flights of the balloon-borne Michelson Interferometer for Passive
Atmospheric Sounding (MIPAS-B) were carried out from Kiruna (68 °N, Sweden) in January
2010 and March 2011 inside the stratospheric polar vortices. Diurnal variations of BrONO2
around sunrise are measured by MIPAS-B for the first time.
Dedicated to the simultaneous observation of BrO and BrONO2 including their diurnal
variability, a balloon campaign took place from Timmins (49 °N, Canada) in September
2014. The remote sounding instrumentation consisted of three spectrometers covering the
UV-VIS, the mid-infrared and the sub-mm/microwave spectral region. In this contribution we
present the first results from MIPAS-B: time- and height-dependent distributions of BrONO2
and NO2 volume mixing ratios together with a comprehensive error estimation and further
diagnostic parameters of the inversion procedure.
All results will be compared to the Chemistry Climate Model EMAC (ECHAM5/MESSy
Atmospheric Chemistry). |
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