The two-day wave in the Antarctic and Arctic mesosphere and lower thermosphere
There have been comparatively few studies reported of the 2-day planetary wave in the middle atmosphere at polar latitudes. Here we report on a study made using high-latitude meteor radars at Rothera in the Antarctic (68° S, 68° W) and Esrange in Arctic Sweden (68° N, 21° E). Observations from 2005–...
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ftdoajarticles:oai:doaj.org/article:ee2b1830ecd846fa92b1786754d7e2e7 2023-05-15T13:54:36+02:00 The two-day wave in the Antarctic and Arctic mesosphere and lower thermosphere V. M. Tunbridge N. J. Mitchell 2009-09-01T00:00:00Z https://doi.org/10.5194/acp-9-6377-2009 https://doaj.org/article/ee2b1830ecd846fa92b1786754d7e2e7 EN eng Copernicus Publications http://www.atmos-chem-phys.net/9/6377/2009/acp-9-6377-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-9-6377-2009 https://doaj.org/article/ee2b1830ecd846fa92b1786754d7e2e7 Atmospheric Chemistry and Physics, Vol 9, Iss 17, Pp 6377-6388 (2009) Physics QC1-999 Chemistry QD1-999 article 2009 ftdoajarticles https://doi.org/10.5194/acp-9-6377-2009 2022-12-31T14:58:20Z There have been comparatively few studies reported of the 2-day planetary wave in the middle atmosphere at polar latitudes. Here we report on a study made using high-latitude meteor radars at Rothera in the Antarctic (68° S, 68° W) and Esrange in Arctic Sweden (68° N, 21° E). Observations from 2005–2008 are used for Rothera and from 1999–2008 for Esrange. Measurements were made of horizontal winds at heights of 80–100 km. The radar data revealed distinct summertime and wintertime 2-day waves. The Antarctic summertime wave occurs with significant amplitudes in January – February at heights between about 88–100 km. Horizontal wind monthly variances associated with the wave exceed 160 m 2 s −2 and the zonal component has larger amplitudes than the meridional. In contrast, the Arctic summertime wave occurs for a longer duration, June–August and has meridional amplitudes larger than the zonal amplitudes. The Arctic summertime wave is weaker than that in the Antarctic and maximum monthly variances are typically 60 m 2 s −2 . In both hemispheres the summertime wave reaches largest amplitudes in the strongly sheared eastward zonal flow above the zero-wind line and is largely absent in the westward flow below. The observed differences in the summertime wave are probably due to the differences in the background zonal winds in the two hemispheres. The Antarctic and Arctic wintertime 2-day waves have very similar behaviour. The Antarctic wave has significant amplitudes in May–August and the Arctic wave in November–February. Both are evident across the full height range observed. Article in Journal/Newspaper Antarc* Antarctic Arctic Directory of Open Access Journals: DOAJ Articles Arctic Antarctic The Antarctic Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) Esrange ENVELOPE(21.117,21.117,67.883,67.883) Atmospheric Chemistry and Physics 9 17 6377 6388 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
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language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 V. M. Tunbridge N. J. Mitchell The two-day wave in the Antarctic and Arctic mesosphere and lower thermosphere |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
There have been comparatively few studies reported of the 2-day planetary wave in the middle atmosphere at polar latitudes. Here we report on a study made using high-latitude meteor radars at Rothera in the Antarctic (68° S, 68° W) and Esrange in Arctic Sweden (68° N, 21° E). Observations from 2005–2008 are used for Rothera and from 1999–2008 for Esrange. Measurements were made of horizontal winds at heights of 80–100 km. The radar data revealed distinct summertime and wintertime 2-day waves. The Antarctic summertime wave occurs with significant amplitudes in January – February at heights between about 88–100 km. Horizontal wind monthly variances associated with the wave exceed 160 m 2 s −2 and the zonal component has larger amplitudes than the meridional. In contrast, the Arctic summertime wave occurs for a longer duration, June–August and has meridional amplitudes larger than the zonal amplitudes. The Arctic summertime wave is weaker than that in the Antarctic and maximum monthly variances are typically 60 m 2 s −2 . In both hemispheres the summertime wave reaches largest amplitudes in the strongly sheared eastward zonal flow above the zero-wind line and is largely absent in the westward flow below. The observed differences in the summertime wave are probably due to the differences in the background zonal winds in the two hemispheres. The Antarctic and Arctic wintertime 2-day waves have very similar behaviour. The Antarctic wave has significant amplitudes in May–August and the Arctic wave in November–February. Both are evident across the full height range observed. |
format |
Article in Journal/Newspaper |
author |
V. M. Tunbridge N. J. Mitchell |
author_facet |
V. M. Tunbridge N. J. Mitchell |
author_sort |
V. M. Tunbridge |
title |
The two-day wave in the Antarctic and Arctic mesosphere and lower thermosphere |
title_short |
The two-day wave in the Antarctic and Arctic mesosphere and lower thermosphere |
title_full |
The two-day wave in the Antarctic and Arctic mesosphere and lower thermosphere |
title_fullStr |
The two-day wave in the Antarctic and Arctic mesosphere and lower thermosphere |
title_full_unstemmed |
The two-day wave in the Antarctic and Arctic mesosphere and lower thermosphere |
title_sort |
two-day wave in the antarctic and arctic mesosphere and lower thermosphere |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doi.org/10.5194/acp-9-6377-2009 https://doaj.org/article/ee2b1830ecd846fa92b1786754d7e2e7 |
long_lat |
ENVELOPE(-68.130,-68.130,-67.568,-67.568) ENVELOPE(21.117,21.117,67.883,67.883) |
geographic |
Arctic Antarctic The Antarctic Rothera Esrange |
geographic_facet |
Arctic Antarctic The Antarctic Rothera Esrange |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 9, Iss 17, Pp 6377-6388 (2009) |
op_relation |
http://www.atmos-chem-phys.net/9/6377/2009/acp-9-6377-2009.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 doi:10.5194/acp-9-6377-2009 https://doaj.org/article/ee2b1830ecd846fa92b1786754d7e2e7 |
op_doi |
https://doi.org/10.5194/acp-9-6377-2009 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
9 |
container_issue |
17 |
container_start_page |
6377 |
op_container_end_page |
6388 |
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1766260594436997120 |