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| Titel |
Balloon-borne stratospheric BrO measurements: comparison with Envisat/SCIAMACHY BrO limb profiles |
| VerfasserIn |
M. Dorf, H. Bösch, A. Butz, C. Camy-Peyret, M. P. Chipperfield, A. Engel, F. Goutail, K. Grunow, F. Hendrick, S. Hrechanyy, B. Naujokat, J.-P. Pommereau, M. Roozendael, C. Sioris, F. Stroh, F. Weidner, K. Pfeilsticker |
| 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 ; 6, no. 9 ; Nr. 6, no. 9 (2006-06-29), S.2483-2501 |
| Datensatznummer |
250003973
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| Publikation (Nr.) |
 copernicus.org/acp-6-2483-2006.pdf |
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| Zusammenfassung |
| For the first time, results of four stratospheric BrO
profiling instruments, are presented and compared with reference to the
SLIMCAT 3-dimensional chemical transport model (3-D CTM). Model calculations
are used to infer a BrO profile validation set, measured by 3
different balloon sensors, for the new Envisat/SCIAMACHY (ENVIronment
SATellite/SCanning Imaging Absorption spectroMeter for Atmospheric
CHartographY) satellite instrument. The balloon observations include (a)
balloon-borne in situ resonance fluorescence detection of
BrO (Triple), (b) balloon-borne solar occultation DOAS measurements
(Differential Optical Absorption Spectroscopy) of BrO in the UV, and
(c) BrO profiling from the solar occultation SAOZ (Systeme d'Analyse
par Observation Zenithale) balloon instrument. Since stratospheric BrO
is subject to considerable diurnal variation and none of the measurements are
performed close enough in time and space for a direct comparison, all balloon
observations are considered with reference to outputs from the 3-D CTM. The
referencing is performed by forward and backward air mass trajectory
calculations to match the balloon with the satellite observations. The
diurnal variation of BrO is considered by 1-D photochemical model
calculation along the trajectories. The 1-D photochemical model is
initialised with output data of the 3-D model with additional constraints on
the vertical transport, the total amount and photochemistry of stratospheric
bromine as given by the various balloon observations. Total
[Bry]=(20.1±2.5) pptv obtained from DOAS BrO observations at
mid-latitudes in 2003, serves as an upper limit of the comparison. Most of
the balloon observations agree with the photochemical model predictions
within their given error estimates. First retrieval exercises of BrO
limb profiling from the SCIAMACHY satellite instrument on average
agree to around 20% with the photochemically-corrected balloon observations
of the remote sensing instruments (SAOZ and DOAS). An exception is the in situ
Triple profile, in which the balloon and satellite
data mostly does not agree within the given errors.
In general, the satellite measurements show systematically higher
values below 25 km than the balloon data and a change in profile shape above about 25 km. |
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