Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer
Using absorption data measured by imaging riometer for ionospheric studies (IRIS) located at the South Africa National Antarctic Expedition (SANAE), Antarctica (72° S, 3° W), we extracted the parameters of gravity waves (GW) of periods between 40 and 50 min during late winter/spring of the year 2002...
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ftdoajarticles:oai:doaj.org/article:43f99c5abf71485dbf37b442e96e6d19 2023-05-15T13:40:02+02:00 Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer N. Mbatha V. Sivakumar H. Bencherif S. Malinga 2013-10-01T00:00:00Z https://doi.org/10.5194/angeo-31-1709-2013 https://doaj.org/article/43f99c5abf71485dbf37b442e96e6d19 EN eng Copernicus Publications https://www.ann-geophys.net/31/1709/2013/angeo-31-1709-2013.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-31-1709-2013 0992-7689 1432-0576 https://doaj.org/article/43f99c5abf71485dbf37b442e96e6d19 Annales Geophysicae, Vol 31, Pp 1709-1719 (2013) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2013 ftdoajarticles https://doi.org/10.5194/angeo-31-1709-2013 2022-12-31T15:57:47Z Using absorption data measured by imaging riometer for ionospheric studies (IRIS) located at the South Africa National Antarctic Expedition (SANAE), Antarctica (72° S, 3° W), we extracted the parameters of gravity waves (GW) of periods between 40 and 50 min during late winter/spring of the year 2002, a period of the unprecedented major sudden stratospheric warming (SSW) in the Southern Hemisphere middle atmosphere. During this period, an unprecedented substantial increase of temperature by about 25–30 K throughout the stratosphere was observed. During the period of the occurrence of the major stratospheric warming, there was a reduction of both the GW horizontal phase speeds and the horizontal wavelengths at 90 km. The GW phase speeds and horizontal wavelengths were observed to reach minimum values of about 7 m s −1 and 19 km, respectively, while during the quiet period the average value of the phase speed and horizontal wavelength was approximately 23 m s −1 and 62 km, respectively. The observed event is discussed in terms of momentum flux and also a potential interaction of gravity waves, planetary waves and mean circulation. Article in Journal/Newspaper Antarc* Antarctic Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic SANAE ENVELOPE(-2.850,-2.850,-71.667,-71.667) Annales Geophysicae 31 10 1709 1719 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 N. Mbatha V. Sivakumar H. Bencherif S. Malinga Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Using absorption data measured by imaging riometer for ionospheric studies (IRIS) located at the South Africa National Antarctic Expedition (SANAE), Antarctica (72° S, 3° W), we extracted the parameters of gravity waves (GW) of periods between 40 and 50 min during late winter/spring of the year 2002, a period of the unprecedented major sudden stratospheric warming (SSW) in the Southern Hemisphere middle atmosphere. During this period, an unprecedented substantial increase of temperature by about 25–30 K throughout the stratosphere was observed. During the period of the occurrence of the major stratospheric warming, there was a reduction of both the GW horizontal phase speeds and the horizontal wavelengths at 90 km. The GW phase speeds and horizontal wavelengths were observed to reach minimum values of about 7 m s −1 and 19 km, respectively, while during the quiet period the average value of the phase speed and horizontal wavelength was approximately 23 m s −1 and 62 km, respectively. The observed event is discussed in terms of momentum flux and also a potential interaction of gravity waves, planetary waves and mean circulation. |
format |
Article in Journal/Newspaper |
author |
N. Mbatha V. Sivakumar H. Bencherif S. Malinga |
author_facet |
N. Mbatha V. Sivakumar H. Bencherif S. Malinga |
author_sort |
N. Mbatha |
title |
Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer |
title_short |
Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer |
title_full |
Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer |
title_fullStr |
Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer |
title_full_unstemmed |
Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer |
title_sort |
extracting gravity wave parameters during the september 2002 southern hemisphere major sudden stratospheric warming using a sanae imaging riometer |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/angeo-31-1709-2013 https://doaj.org/article/43f99c5abf71485dbf37b442e96e6d19 |
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_source |
Annales Geophysicae, Vol 31, Pp 1709-1719 (2013) |
op_relation |
https://www.ann-geophys.net/31/1709/2013/angeo-31-1709-2013.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-31-1709-2013 0992-7689 1432-0576 https://doaj.org/article/43f99c5abf71485dbf37b442e96e6d19 |
op_doi |
https://doi.org/10.5194/angeo-31-1709-2013 |
container_title |
Annales Geophysicae |
container_volume |
31 |
container_issue |
10 |
container_start_page |
1709 |
op_container_end_page |
1719 |
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1766127206804750336 |