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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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00021438 2023-05-15T13:41:01+02:00 Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer Mbatha, N. Sivakumar, V. Bencherif, H. Malinga, S. 2013-10 electronic https://doi.org/10.5194/angeo-31-1709-2013 https://noa.gwlb.de/receive/cop_mods_00021438 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00021393/angeo-31-1709-2013.pdf https://angeo.copernicus.org/articles/31/1709/2013/angeo-31-1709-2013.pdf eng eng Copernicus Publications Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-31-1709-2013 https://noa.gwlb.de/receive/cop_mods_00021438 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00021393/angeo-31-1709-2013.pdf https://angeo.copernicus.org/articles/31/1709/2013/angeo-31-1709-2013.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2013 ftnonlinearchiv https://doi.org/10.5194/angeo-31-1709-2013 2022-02-08T22:51:39Z 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 Niedersächsisches Online-Archiv NOA Antarctic SANAE ENVELOPE(-2.850,-2.850,-71.667,-71.667) Annales Geophysicae 31 10 1709 1719 |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Mbatha, N. Sivakumar, V. Bencherif, H. Malinga, S. Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer |
topic_facet |
article Verlagsveröffentlichung |
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 |
Mbatha, N. Sivakumar, V. Bencherif, H. Malinga, S. |
author_facet |
Mbatha, N. Sivakumar, V. Bencherif, H. Malinga, S. |
author_sort |
Mbatha, N. |
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://noa.gwlb.de/receive/cop_mods_00021438 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00021393/angeo-31-1709-2013.pdf https://angeo.copernicus.org/articles/31/1709/2013/angeo-31-1709-2013.pdf |
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 |
Annales Geophysicae -- http://www.bibliothek.uni-regensburg.de/ezeit/?1458425 -- https://www.ann-geophys.net/ -- https://www.ann-geophys.net/volumes.html -- http://link.springer.com/journal/585 -- 1432-0576 https://doi.org/10.5194/angeo-31-1709-2013 https://noa.gwlb.de/receive/cop_mods_00021438 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00021393/angeo-31-1709-2013.pdf https://angeo.copernicus.org/articles/31/1709/2013/angeo-31-1709-2013.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
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 |
_version_ |
1766144736627785728 |