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...
Published in: | Annales Geophysicae |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/angeo-28-267-2010 https://angeo.copernicus.org/articles/28/267/2010/ |
id |
ftcopernicus:oai:publications.copernicus.org:angeo2295 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:angeo2295 2023-05-15T13:36:36+02:00 Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event Azeem, S. M. I. Talaat, E. R. Sivjee, G. G. Yee, J.-H. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-28-267-2010 https://angeo.copernicus.org/articles/28/267/2010/ eng eng doi:10.5194/angeo-28-267-2010 https://angeo.copernicus.org/articles/28/267/2010/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-28-267-2010 2020-07-20T16:26:29Z 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. Text Antarc* Antarctic Antarctica South pole South pole Copernicus Publications: E-Journals Antarctic Austral South Pole Annales Geophysicae 28 1 267 276 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 |
Text |
author |
Azeem, S. M. I. Talaat, E. R. Sivjee, G. G. Yee, J.-H. |
spellingShingle |
Azeem, S. M. I. Talaat, E. R. Sivjee, G. G. Yee, J.-H. Mesosphere and lower thermosphere temperature anomalies during the 2002 Antarctic stratospheric warming event |
author_facet |
Azeem, S. M. I. Talaat, E. R. Sivjee, G. G. Yee, J.-H. |
author_sort |
Azeem, S. M. I. |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-28-267-2010 https://angeo.copernicus.org/articles/28/267/2010/ |
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 |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-28-267-2010 https://angeo.copernicus.org/articles/28/267/2010/ |
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 |
_version_ |
1766081408970784768 |