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| Titel |
Analysis of satellite-derived Arctic tropospheric BrO columns in conjunction with aircraft measurements during ARCTAS and ARCPAC |
| VerfasserIn |
S. Choi, Y. Wang, R. J. Salawitch, T. Canty, J. Joiner, T. Zeng, T. P. Kurosu, K. Chance, A. Richter, L. G. Huey, J. Liao, J. A. Neuman, J. B. Nowak, J. E. Dibb, A. J. Weinheimer, G. Diskin, T. B. Ryerson, A. Silva, J. Curry, D. Kinnison, S. Tilmes, P. F. Levelt |
| 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 ; 12, no. 3 ; Nr. 12, no. 3 (2012-02-01), S.1255-1285 |
| Datensatznummer |
250010629
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| Publikation (Nr.) |
 copernicus.org/acp-12-1255-2012.pdf |
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| Zusammenfassung |
| We derive tropospheric column BrO during the ARCTAS and ARCPAC field
campaigns in spring 2008 using retrievals of total column BrO from the
satellite UV nadir sensors OMI and GOME-2 using a radiative transfer model
and stratospheric column BrO from a photochemical simulation. We conduct a
comprehensive comparison of satellite-derived tropospheric BrO column to
aircraft in-situ observations of BrO and related species. The aircraft
profiles reveal that tropospheric BrO, when present during April 2008, was
distributed over a broad range of altitudes rather than being confined to the
planetary boundary layer (PBL). Perturbations to the total column resulting
from tropospheric BrO are the same magnitude as perturbations due to
longitudinal variations in the stratospheric component, so proper accounting
of the stratospheric signal is essential for accurate determination of
satellite-derived tropospheric BrO. We find reasonably good agreement between
satellite-derived tropospheric BrO and columns found using aircraft in-situ
BrO profiles, particularly when satellite radiances were obtained over bright
surfaces (albedo >0.7), for solar zenith angle <80° and clear sky
conditions. The rapid activation of BrO due to surface processes (the bromine
explosion) is apparent in both the OMI and GOME-2 based tropospheric columns.
The wide orbital swath of OMI allows examination of the evolution of
tropospheric BrO on about hourly time intervals near the pole. Low surface
pressure, strong wind, and high PBL height are associated with an observed
BrO activation event, supporting the notion of bromine activation by high
winds over snow. |
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