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| Titel |
A climatology of the diurnal variations in stratospheric and mesospheric ozone over Bern, Switzerland |
| VerfasserIn |
S. Studer, K. Hocke, A. Schanz, H. Schmidt, N. Kämpfer |
| 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. 12 ; Nr. 14, no. 12 (2014-06-16), S.5905-5919 |
| Datensatznummer |
250118810
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| Publikation (Nr.) |
 copernicus.org/acp-14-5905-2014.pdf |
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| Zusammenfassung |
| The ground-based radiometer GROMOS, stationed in Bern (47.95° N,
7.44° E), Switzerland, has a unique data set: it obtains ozone
profiles from November 1994 to present with a time resolution of 30 min
and equivalent quality during night- and daytime. Here, we derive a monthly
climatology of the daily ozone cycle from 17 years of GROMOS observation. We
present the diurnal ozone variation of the stratosphere and mesosphere.
Characterizing the diurnal cycle of stratospheric ozone is important for
correct trend estimates of the ozone layer derived from satellite
observations. The diurnal ozone cycle from GROMOS is compared to two models:
the Whole Atmosphere Community Climate Model (WACCM) and the Hamburg Model of
Neutral and Ionized Atmosphere (HAMMONIA). Generally, observation and models
show a good agreement: in the lower mesosphere, daytime ozone is for both
GROMOS and models around 25% less than midnight ozone. In the stratosphere,
ozone reaches its maximum in the afternoon showing values several percent
larger than the midnight value. Further, GROMOS and models indicate a
seasonal behaviour of the diurnal ozone variations in the stratosphere with a
larger afternoon maximum during daytime in summer than in winter. Using the
17 years of ozone profiles from GROMOS, we find strong interannual variations
in the diurnal ozone cycle for both the stratosphere and the mesosphere.
Interannual variability in temperature, atmospheric circulation and
composition may explain the observed interannual variability of the diurnal
ozone cycle above Bern. |
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