Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements
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...
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ftunivpretoria:oai:repository.up.ac.za:2263/15341 2023-05-15T14:02:58+02:00 Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements Mbatha, Nkanyiso Sivakumar, Venkataraman Malinga, Sandile B. Bencherif, Hassan Pillay, Sadhasivan R. 2010-04 http://hdl.handle.net/2263/15341 en eng Copernicus on behalf of the European Geosciences Union http://hdl.handle.net/2263/15341 Mbatha, N, Sivakumar, V, Malinga, SB, Bencherif, H & Pillay, SR 2010, 'Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements', Atmospheric Chemistry and Physics, vol. 10, no. 7, pp. 3397–3404. [http://www.atmos-chem-phys.net/] 1680-7316 © Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. CC-BY Stratosphere warming HF radar measurements Stratospheric winds Radar meteorology Satellite meteorology Article 2010 ftunivpretoria 2022-05-31T13:23:34Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica University of Pretoria: UPSpace Antarctic SANAE ENVELOPE(-2.850,-2.850,-71.667,-71.667) |
institution |
Open Polar |
collection |
University of Pretoria: UPSpace |
op_collection_id |
ftunivpretoria |
language |
English |
topic |
Stratosphere warming HF radar measurements Stratospheric winds Radar meteorology Satellite meteorology |
spellingShingle |
Stratosphere warming HF radar measurements Stratospheric winds Radar meteorology Satellite meteorology Mbatha, Nkanyiso Sivakumar, Venkataraman Malinga, Sandile B. Bencherif, Hassan Pillay, Sadhasivan R. Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements |
topic_facet |
Stratosphere warming HF radar measurements Stratospheric winds Radar meteorology Satellite meteorology |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Mbatha, Nkanyiso Sivakumar, Venkataraman Malinga, Sandile B. Bencherif, Hassan Pillay, Sadhasivan R. |
author_facet |
Mbatha, Nkanyiso Sivakumar, Venkataraman Malinga, Sandile B. Bencherif, Hassan Pillay, Sadhasivan R. |
author_sort |
Mbatha, Nkanyiso |
title |
Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements |
title_short |
Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements |
title_full |
Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements |
title_fullStr |
Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements |
title_full_unstemmed |
Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements |
title_sort |
study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and hf radar measurements |
publisher |
Copernicus on behalf of the European Geosciences Union |
publishDate |
2010 |
url |
http://hdl.handle.net/2263/15341 |
long_lat |
ENVELOPE(-2.850,-2.850,-71.667,-71.667) |
geographic |
Antarctic SANAE |
geographic_facet |
Antarctic SANAE |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://hdl.handle.net/2263/15341 Mbatha, N, Sivakumar, V, Malinga, SB, Bencherif, H & Pillay, SR 2010, 'Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar measurements', Atmospheric Chemistry and Physics, vol. 10, no. 7, pp. 3397–3404. [http://www.atmos-chem-phys.net/] 1680-7316 |
op_rights |
© Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_rightsnorm |
CC-BY |
_version_ |
1766273419022696448 |