Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer
International audience Using absorption data measured by imaging ri-ometer 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 win-...
Published in: | Annales Geophysicae |
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Main Authors: | , , , |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.univ-reunion.fr/hal-01387268 https://hal.univ-reunion.fr/hal-01387268/document https://hal.univ-reunion.fr/hal-01387268/file/Mbatha%20et%20al,%20ANG%202013_hal%20%281%29.pdf https://doi.org/10.5194/angeo-31-1709-2013 |
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ftccsdartic:oai:HAL:hal-01387268v1 2023-05-15T13:40:37+02:00 Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer Mbatha, Nkanyiso Sivakumar, Venkataraman Bencherif, Hassan Malinga, Sandile B. South African National Space Agency (SANSA) South African National Space Agency University of KwaZulu-Natal (UKZN) Laboratoire de l'Atmosphère et des Cyclones (LACy) Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS) 2013 https://hal.univ-reunion.fr/hal-01387268 https://hal.univ-reunion.fr/hal-01387268/document https://hal.univ-reunion.fr/hal-01387268/file/Mbatha%20et%20al,%20ANG%202013_hal%20%281%29.pdf https://doi.org/10.5194/angeo-31-1709-2013 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/angeo-31-1709-2013 hal-01387268 https://hal.univ-reunion.fr/hal-01387268 https://hal.univ-reunion.fr/hal-01387268/document https://hal.univ-reunion.fr/hal-01387268/file/Mbatha%20et%20al,%20ANG%202013_hal%20%281%29.pdf doi:10.5194/angeo-31-1709-2013 info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.univ-reunion.fr/hal-01387268 Annales Geophysicae, European Geosciences Union, 2013, 31 (10), pp.1709 - 1719. ⟨10.5194/angeo-31-1709-2013⟩ [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] info:eu-repo/semantics/article Journal articles 2013 ftccsdartic https://doi.org/10.5194/angeo-31-1709-2013 2021-10-24T09:46:26Z International audience Using absorption data measured by imaging ri-ometer 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 win-ter/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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic SANAE ENVELOPE(-2.850,-2.850,-71.667,-71.667) Annales Geophysicae 31 10 1709 1719 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] Mbatha, Nkanyiso Sivakumar, Venkataraman Bencherif, Hassan Malinga, Sandile B. Extracting gravity wave parameters during the September 2002 Southern Hemisphere major sudden stratospheric warming using a SANAE imaging riometer |
topic_facet |
[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] |
description |
International audience Using absorption data measured by imaging ri-ometer 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 win-ter/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. |
author2 |
South African National Space Agency (SANSA) South African National Space Agency University of KwaZulu-Natal (UKZN) Laboratoire de l'Atmosphère et des Cyclones (LACy) Institut national des sciences de l'Univers (INSU - CNRS)-Météo France-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Mbatha, Nkanyiso Sivakumar, Venkataraman Bencherif, Hassan Malinga, Sandile B. |
author_facet |
Mbatha, Nkanyiso Sivakumar, Venkataraman Bencherif, Hassan Malinga, Sandile B. |
author_sort |
Mbatha, Nkanyiso |
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 |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.univ-reunion.fr/hal-01387268 https://hal.univ-reunion.fr/hal-01387268/document https://hal.univ-reunion.fr/hal-01387268/file/Mbatha%20et%20al,%20ANG%202013_hal%20%281%29.pdf https://doi.org/10.5194/angeo-31-1709-2013 |
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 |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.univ-reunion.fr/hal-01387268 Annales Geophysicae, European Geosciences Union, 2013, 31 (10), pp.1709 - 1719. ⟨10.5194/angeo-31-1709-2013⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/angeo-31-1709-2013 hal-01387268 https://hal.univ-reunion.fr/hal-01387268 https://hal.univ-reunion.fr/hal-01387268/document https://hal.univ-reunion.fr/hal-01387268/file/Mbatha%20et%20al,%20ANG%202013_hal%20%281%29.pdf doi:10.5194/angeo-31-1709-2013 |
op_rights |
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 |
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1766137600078249984 |