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| Titel |
BrO profiling in the arctic troposphere during spring 2007 |
| VerfasserIn |
C. Prados-Roman, A. Butz, T. Deutschmann, M. Dorf, L. Kritten, A. Minikin, H. Schlager, N. Theys, M. Van Roozendael, K. Pfeilsticker |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250034368
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| Zusammenfassung |
| A limb scanning mini-DOAS instrument was deployed on the DLR-Falcon aircraft during the
ASTAR 2007 campaign ("Arctic Study of Tropospheric Aerosol, Clouds and Radiation", IPY
2007/8) that took place at Svalbard (78oN) in April 2007. The novel technique proved to be
suitable for sensitive air-borne detection of some key radicals (e.g., BrO detection limit ~1.5
pptv) in the atmospheric photochemistry.
Specific results obtained during the ASTAR 2007 campaign are: (1) first deployment of a
novel aircraft-borne mini-DOAS limb instrument and demonstration of its feasibility, (2) the
implementation of a novel retrieval method independently tested with an absorber with
known profile (O4), (3) the development of a satisfactory aerosol inversion scheme in
order to account properly for the radiative transfer, and (4) the sensitive detection of
tropospheric BrO profiles having ~10 degrees of freedom while using no BrO a priori
information.
During the arctic spring, our BrO profile measurements indicate (a) large BrO
concentrations (~15 pptv) during ozone depletion events within the boundary layer, (b) low
BrO concentrations (-¤ 1.5 pptv) in the free troposphere, (c) occasionally enhanced BrO
(~1.5 pptv) in the upper troposphere, and (d) increasing BrO with altitude in the
lowermost stratosphere, well in agreement with other observations (satellite and balloon
soundings).
Furthermore, our BrO profiles are compared with total atmospheric Vertical Column
Densities (VCD) detected by satellites (GOME II, ENVISAT/SCIAMACHY) and integrated
stratospheric profiles (e.g. measured by our direct sunlight DOAS instrument on board
balloon platforms). Overall, the comparison of our data indicate, within the errors,
consistency with data from each of the other methods. |
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