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| Titel |
Observations of middle atmospheric H2O and O3 during the 2010 major sudden stratospheric warming by a network of microwave radiometers |
| VerfasserIn |
D. Scheiben, C. Straub, K. Hocke, P. Forkman, 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 ; 12, no. 16 ; Nr. 12, no. 16 (2012-08-28), S.7753-7765 |
| Datensatznummer |
250011415
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| Publikation (Nr.) |
 copernicus.org/acp-12-7753-2012.pdf |
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| Zusammenfassung |
| In this study, we present middle atmospheric water vapor (H2O) and ozone
(O3) measurements obtained by ground-based microwave radiometers at three
European locations in Bern (47° N), Onsala (57° N) and
Sodankylä (67° N) during Northern winter 2009/2010. In January
2010, a major sudden stratospheric warming (SSW) occurred in the Northern
Hemisphere whose signatures are evident in the ground-based observations of
H2O and O3. The observed anomalies in H2O and O3 are mostly
explained by the relative location of the polar vortex with respect to the
measurement locations. The SSW started on 26 January 2010 and was most
pronounced by the end of January. The zonal mean temperature in the middle
stratosphere (10 hPa) increased by approximately 25 Kelvin within a few
days. The stratospheric vortex weakened during the SSW and shifted towards
Europe. In the mesosphere, the vortex broke down, which lead to large scale
mixing of polar and midlatitudinal air. After the warming, the polar vortex
in the stratosphere split into two weaker vortices and in the mesosphere, a
new, pole-centered vortex formed with maximum wind speed of 70 m s−1
at approximately 40° N. The shift of the stratospheric vortex towards
Europe was observed in Bern as an increase in stratospheric H2O and a
decrease in O3. The breakdown of the mesospheric vortex during the SSW was
observed at Onsala and Sodankylä as a sudden increase in mesospheric
H2O. The following large-scale descent inside the newly formed mesospheric
vortex was well captured by the H2O observations in Sodankylä. In
order to combine the H2O observations from the three different locations,
we applied the trajectory mapping technique on our H2O observations to
derive synoptic scale maps of the H2O distribution. Based on our
observations and the 3-D wind field, this method allows determining the
approximate development of the stratospheric and mesospheric polar vortex and
demonstrates the potential of a network of ground-based instruments. |
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