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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3737

Title: Study on the impact of sudden stratosphere warming in the upper mesosphere-lower thermosphere regions using satellite and HF radar - [Article]
Authors: Mbatha, N
Sivakumar, V
Malinga, SB
Bencherif, H
Pillay, SR
Keywords: Stratosphere warming
Mesosphere
Thermosphere
High frequency radar
Satellite measurements
Mesosphere-lower thermospheric
Temperature
Atmospheric chemistry
Physics
Super dual auroral radar network
South African National Antarctic Expedition
Broadband Emission Radiometry
SABER
Issue Date: 2010
Publisher: Copernicus Publications & European Geosciences Union
Citation: Mbatha, N, Venkataraman, S, Malinga, SB et al. 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 Duscussions, Vol. 10, pp 3397–3404
Abstract: The occurrence of sudden stratospheric warming (SSW) excites disturbances in the mesosphere-lower thermospheric (MLT) wind and temperature. Here, researchers have examined the high frequency (HF) radar wind data from the South African National Antarctic Expedition, SANAE (72° S, 5 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 were use to investigate the dynamical 10 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 in 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 were many periods of westward 15 winds observed compared to other years. The dynamic 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.
Description: This work is distributed under the Creative Commons Attribution 3.0 License.
URI: http://hdl.handle.net/10204/3737
http://www.atmos-chem-phys.net/10/3397/2010/acp-10-3397-2010.pdf
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