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| Titel |
Dependence of the vertical distribution of bromine monoxide in the lower troposphere on meteorological factors such as wind speed and stability |
| VerfasserIn |
P. K. Peterson, W. R. Simpson, K. A. Pratt, P. B. Shepson, U. Frieß, J. Zielcke, U. Platt, S. J. Walsh, S. V. Nghiem |
| 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 ; 15, no. 4 ; Nr. 15, no. 4 (2015-02-26), S.2119-2137 |
| Datensatznummer |
250119463
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| Publikation (Nr.) |
 copernicus.org/acp-15-2119-2015.pdf |
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| Zusammenfassung |
| Multiple axis differential absorption spectroscopy (MAX-DOAS)
measurements of bromine monoxide (BrO) probed the vertical
structure of halogen activation events during March–May 2012 at
Barrow, Alaska. An analysis of the BrO averaging kernels and
degrees of freedom obtained by optimal-estimation-based inversions
from raw MAX-DOAS measurements reveals the information is best
represented by reducing the retrieved BrO profile to two
quantities: the integrated column from the surface through
200 m (VCD200 m), and the lower tropospheric vertical
column density (LT-VCD), which represents the integrated column of
BrO from the surface through 2 km. The percentage of
lower tropospheric BrO in the lowest 200 m was found to
be highly variable ranging from shallow layer events, where BrO
is present primarily in the lowest 200 m, to distributed column
events where BrO is observed at higher altitudes. The highest
observed LT-VCD events occurred when BrO was distributed
throughout the lower troposphere, rather than concentrated near the
surface. Atmospheric stability in the lowest 200 m influenced
the percentage of LT-VCD that is in the lowest 200 m, with
inverted temperature structures having a first-to-third quartile range
(Q1–Q3) of VCD200 m/LT-VCD from 15–39%, while near-neutral-temperature structures had a Q1–Q3 range of
7–13%. Data from this campaign show no clear influence of
wind speed on either lower tropospheric bromine activation (LT-VCD) or
the vertical distribution of BrO, while examination of seasonal
trends and the temperature dependence of the vertical distribution
supported the conclusion that the atmospheric stability affects the
vertical distribution of BrO. |
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