Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event
We present kinetic temperatures at ~87 km and ~94 km altitudes inferred from OH (6,2) and O 2 At(0,1) airglow observations, respectively, at South Pole (90° S), Antarctica in the austral winter of 2002. These OH and O 2 rotational temperatures measurements show mesosphere and lower thermosphere (MLT...
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ftdoajarticles:oai:doaj.org/article:95420da7d801469bb19ae665c5405789 2023-05-15T13:56:50+02:00 Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event S. M. I. Azeem E. R. Talaat G. G. Sivjee J.-H. Yee 2010-01-01T00:00:00Z https://doi.org/10.5194/angeo-28-267-2010 https://doaj.org/article/95420da7d801469bb19ae665c5405789 EN eng Copernicus Publications https://www.ann-geophys.net/28/267/2010/angeo-28-267-2010.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-28-267-2010 0992-7689 1432-0576 https://doaj.org/article/95420da7d801469bb19ae665c5405789 Annales Geophysicae, Vol 28, Pp 267-276 (2010) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2010 ftdoajarticles https://doi.org/10.5194/angeo-28-267-2010 2022-12-31T04:43:10Z We present kinetic temperatures at ~87 km and ~94 km altitudes inferred from OH (6,2) and O 2 At(0,1) airglow observations, respectively, at South Pole (90° S), Antarctica in the austral winter of 2002. These OH and O 2 rotational temperatures measurements show mesosphere and lower thermosphere (MLT) temperature anomalies prior to the 2002 Southern Hemisphere Sudden Stratospheric Warming (SSW) . In this paper we focus on the first of the three minor stratospheric warmings which preceded the major SSW event. Temperature anomalies observed in the MLT region show sudden cooling (Δ T =~30 K) in OH temperatures accompanied by warming (Δ T =~15 K) in O 2 temperatures preceding the onset of SSW event by about three to four weeks. This shallow vertical extent of mesospheric cooling is in agreement with the numerical simulation of Coy et al. (2005), however, the model cooling was centered well below the mesopause level. The other observed feature of the South Pole MLT temperature dataset is the intensification of planetary wave activity prior to the onset of SSW event. Fourier analyses of both OH and O 2 temperatures show amplification of planetary wave activity in the 5–10 day range prior to the onset of SSW. The timing of wave amplification seen in the wave spectra coincides with the peak in OH and O 2 temperature anomalies. Article in Journal/Newspaper Antarc* Antarctic Antarctica South pole South pole Directory of Open Access Journals: DOAJ Articles Antarctic Austral South Pole Annales Geophysicae 28 1 267 276 |
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Open Polar |
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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 S. M. I. Azeem E. R. Talaat G. G. Sivjee J.-H. Yee Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
We present kinetic temperatures at ~87 km and ~94 km altitudes inferred from OH (6,2) and O 2 At(0,1) airglow observations, respectively, at South Pole (90° S), Antarctica in the austral winter of 2002. These OH and O 2 rotational temperatures measurements show mesosphere and lower thermosphere (MLT) temperature anomalies prior to the 2002 Southern Hemisphere Sudden Stratospheric Warming (SSW) . In this paper we focus on the first of the three minor stratospheric warmings which preceded the major SSW event. Temperature anomalies observed in the MLT region show sudden cooling (Δ T =~30 K) in OH temperatures accompanied by warming (Δ T =~15 K) in O 2 temperatures preceding the onset of SSW event by about three to four weeks. This shallow vertical extent of mesospheric cooling is in agreement with the numerical simulation of Coy et al. (2005), however, the model cooling was centered well below the mesopause level. The other observed feature of the South Pole MLT temperature dataset is the intensification of planetary wave activity prior to the onset of SSW event. Fourier analyses of both OH and O 2 temperatures show amplification of planetary wave activity in the 5–10 day range prior to the onset of SSW. The timing of wave amplification seen in the wave spectra coincides with the peak in OH and O 2 temperature anomalies. |
format |
Article in Journal/Newspaper |
author |
S. M. I. Azeem E. R. Talaat G. G. Sivjee J.-H. Yee |
author_facet |
S. M. I. Azeem E. R. Talaat G. G. Sivjee J.-H. Yee |
author_sort |
S. M. I. Azeem |
title |
Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event |
title_short |
Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event |
title_full |
Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event |
title_fullStr |
Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event |
title_full_unstemmed |
Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event |
title_sort |
mesosphere and lower thermosphere temperature anomalies during the 2002 antarctic stratospheric warming event |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/angeo-28-267-2010 https://doaj.org/article/95420da7d801469bb19ae665c5405789 |
geographic |
Antarctic Austral South Pole |
geographic_facet |
Antarctic Austral South Pole |
genre |
Antarc* Antarctic Antarctica South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica South pole South pole |
op_source |
Annales Geophysicae, Vol 28, Pp 267-276 (2010) |
op_relation |
https://www.ann-geophys.net/28/267/2010/angeo-28-267-2010.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-28-267-2010 0992-7689 1432-0576 https://doaj.org/article/95420da7d801469bb19ae665c5405789 |
op_doi |
https://doi.org/10.5194/angeo-28-267-2010 |
container_title |
Annales Geophysicae |
container_volume |
28 |
container_issue |
1 |
container_start_page |
267 |
op_container_end_page |
276 |
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1766264406250881024 |