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| Titel |
Deriving an atmospheric budget of total organic bromine using airborne in situ measurements from the western Pacific area during SHIVA |
| VerfasserIn |
S. Sala, H. Bönisch, T. Keber, D. E. Oram, G. Mills, A. Engel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 13 ; Nr. 14, no. 13 (2014-07-04), S.6903-6923 |
| Datensatznummer |
250118870
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| Publikation (Nr.) |
 copernicus.org/acp-14-6903-2014.pdf |
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| Zusammenfassung |
During the recent SHIVA (Stratospheric Ozone: Halogen Impacts in a Varying
Atmosphere) project an extensive data set of all halogen species relevant for
the atmospheric budget of total organic bromine was collected in the western
Pacific region using the Falcon aircraft operated by the German Aerospace
agency DLR (Deutsches Zentrum für Luft- und Raumfahrt) covering a
vertical range from the planetary boundary layer up to the ceiling altitude
of the aircraft of 13 km. In total, more than 700 measurements were
performed with the newly developed fully automated in situ instrument
GHOST-MS (Gas chromatograph for the
Observation of Tracers – coupled with a
Mass Spectrometer) by the Goethe University of Frankfurt
(GUF) and with the onboard whole-air sampler WASP with subsequent
ground-based state-of-the-art GC / MS analysis by the University of East Anglia
(UEA). Both instruments yield good agreement for all major (CHBr3 and
CH2Br2) and minor (CH2BrCl, CHBrCl2 and CHBr2Cl)
VSLS (very short-lived substances), at least at the level of their 2σ
measurement uncertainties.
In contrast to the suggestion that the western Pacific could be a region of
strongly increased atmospheric VSLS abundance (Pyle et al., 2011), we found
only in the upper troposphere a slightly enhanced amount of total organic
bromine from VSLS relative to the levels reported in Montzka and Reimann et
al. (2011) for other tropical regions.
From the SHIVA observations in the upper troposphere, a budget for total
organic bromine, including four halons (H-1301, H-1211, H-1202, H-2402),
CH3Br and the VSLS, is derived for the level of zero radiative heating
(LZRH), the input region for the tropical tropopause layer (TTL) and thus
also for the stratosphere.
With the exception of the two minor VSLS CHBrCl2 and CHBr2Cl,
excellent agreement with the values reported in Montzka and Reimann et al. (2011)
is found, while being slightly higher than previous studies from our
group based on balloon-borne measurements. |
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