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| Titel |
Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements |
| VerfasserIn |
N. Mbatha, V. Sivakumar, S. B. Malinga, H. Bencherif, S. R. Pillay |
| 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 ; 10, no. 7 ; Nr. 10, no. 7 (2010-04-12), S.3397-3404 |
| Datensatznummer |
250008338
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| Publikation (Nr.) |
 copernicus.org/acp-10-3397-2010.pdf |
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| Zusammenfassung |
| The occurrence of a sudden stratospheric warming (SSW) excites disturbances
in the mesosphere-lower thermospheric (MLT) wind and temperature. Here, we
have examined the high frequency (HF) radar wind data from the South African
National Antarctic Expedition, SANAE (72° S, 3° W), a radar which is
part of the Super Dual Auroral Radar Network (SuperDARN). Sounding of the
Atmosphere using Broadband Emission Radiometry (SABER) on board the
Thermosphere-Ionosphere-Mesosphere-Energetics and Dynamics (TIMED)
satellite temperature data and National Centre for Environmental Prediction
(NCEP) temperature and wind data are used to investigate the dynamical
effects of the unprecedented September 2002 SSW in the Antarctica
stratosphere and MLT. The mean zonal wind (from SANAE HF radar) at the MLT
shows reversal approximately 7 days before the reversal at 10 hPa (from
NCEP). This indicates that there was a downwards propagation of circulation
disturbance. Westerly zonal winds dominate the winter MLT, but during the
2002 winter there are many periods of westward winds observed compared to
other years. The normalised power spectrums of both meridional and zonal
winds show presence of planetary waves (of ~14-day period) before the
occurrence of the SSW. The SABER vertical temperature profiles indicated the
cooling of the MLT region before the SSW event. |
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