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| Titel |
Enhanced short-term stratospheric ozone fluctuations observed by the GROMOS microwave radiometer during winter at Bern |
| VerfasserIn |
Lorena Moreira, Klemens Hocke, Niklaus Kämpfer |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250138915
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| Publikation (Nr.) |
 EGU/EGU2017-2056.pdf |
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| Zusammenfassung |
| The ground-based millimeter wave ozone spectrometer (GROMOS) has been continually
measuring stratospheric and lower mesospheric ozone volume mixing ratio (VMR)
profiles above Bern, Switzerland (46.95∘N, 7.44∘E, 577 m) since 1994. The high
temporal resolution of GROMOS (30 minutes) allows the analysis of short-term
fluctuations. The present study analyses the temporal perturbations, ranging from
1 to 4 hours, observed in stratospheric ozone from June 2011 to May 2012. We
observe an increase in mid- and upper stratospheric ozone fluctuations of about 0.05
ppm or 0.9% from December to January. The strongest variations of stratospheric
ozone above Bern are due to displacements of the polar vortex to mid-latitudes,
related with sudden stratospheric warming (SSW) events and produced by breaking
of planetary Rossby waves. The breaking of planetary waves and the disruptions
of the polar vortex edge can also generate fluctuations in stratospheric ozone, for
instance the so-called stratospheric streamers. The increase of inertia-gravity wave
activity at the polar vortex edge during these SSW events can also be related with the
short-term fluctuations observed in mid- and upper stratospheric ozone during winter. |
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