The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere
The 16-day planetary wave in the polar mesosphere and lower thermosphere has been investigated using meteor radars at Esrange (68° N, 21° E) in the Arctic and Rothera (68° S, 68° W) in the Antarctic. The measurements span the 10-year interval from October 1999 to July 2009 and the 5-year interval Fe...
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ftdoajarticles:oai:doaj.org/article:e25a95be62e24c3bae5b084eee615d67 2023-05-15T13:57:49+02:00 The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere K. A. Day N. J. Mitchell 2010-02-01T00:00:00Z https://doaj.org/article/e25a95be62e24c3bae5b084eee615d67 EN eng Copernicus Publications http://www.atmos-chem-phys.net/10/1461/2010/acp-10-1461-2010.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/e25a95be62e24c3bae5b084eee615d67 Atmospheric Chemistry and Physics, Vol 10, Iss 3, Pp 1461-1472 (2010) Physics QC1-999 Chemistry QD1-999 article 2010 ftdoajarticles 2022-12-31T09:13:24Z The 16-day planetary wave in the polar mesosphere and lower thermosphere has been investigated using meteor radars at Esrange (68° N, 21° E) in the Arctic and Rothera (68° S, 68° W) in the Antarctic. The measurements span the 10-year interval from October 1999 to July 2009 and the 5-year interval February 2005 to July 2009, respectively. The height range covered is about 80–100 km. In both polar regions the wave is seen to occur in intermittent bursts, where wave amplitudes typically reach a maximum of about 15 m s −1 , and never more than about 20 m s −1 . Horizontal wind variance within a wave-period range of 12 to 20 days is used as a proxy for the activity of the 16-day wave. Wave activity is strong for 3 to 4 months in winter, where it is present across the entire height range observed and monthly wave variance reaches about 65 m 2 s −2 . Some weak and intermittent activity is observed throughout the other seasons including summer. However, there is a high degree of inter-annual variability and in some individual years wave activity is almost absent. The data are used to construct a representative climatology for the Arctic and Antarctic. The seasonal cycle of the 16-day wave is found to be very similar in both polar regions. The 16-day wave has slightly greater amplitudes in the zonal component of the winds than in the meridional. Mesospheric temperatures measured by the radars were used to further investigate the 16-day wave. The temperatures reveal a clear signature of the 16-day wave. Temperature amplitudes are generally only a few Kelvin but occasional bursts of up to 10 K have been observed. Observations of the wave in summer are sometimes consistent with the suggestion of ducting from the winter hemisphere. Article in Journal/Newspaper Antarc* Antarctic Arctic Directory of Open Access Journals: DOAJ Articles Antarctic Arctic Esrange ENVELOPE(21.117,21.117,67.883,67.883) Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) The Antarctic |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 K. A. Day N. J. Mitchell The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
The 16-day planetary wave in the polar mesosphere and lower thermosphere has been investigated using meteor radars at Esrange (68° N, 21° E) in the Arctic and Rothera (68° S, 68° W) in the Antarctic. The measurements span the 10-year interval from October 1999 to July 2009 and the 5-year interval February 2005 to July 2009, respectively. The height range covered is about 80–100 km. In both polar regions the wave is seen to occur in intermittent bursts, where wave amplitudes typically reach a maximum of about 15 m s −1 , and never more than about 20 m s −1 . Horizontal wind variance within a wave-period range of 12 to 20 days is used as a proxy for the activity of the 16-day wave. Wave activity is strong for 3 to 4 months in winter, where it is present across the entire height range observed and monthly wave variance reaches about 65 m 2 s −2 . Some weak and intermittent activity is observed throughout the other seasons including summer. However, there is a high degree of inter-annual variability and in some individual years wave activity is almost absent. The data are used to construct a representative climatology for the Arctic and Antarctic. The seasonal cycle of the 16-day wave is found to be very similar in both polar regions. The 16-day wave has slightly greater amplitudes in the zonal component of the winds than in the meridional. Mesospheric temperatures measured by the radars were used to further investigate the 16-day wave. The temperatures reveal a clear signature of the 16-day wave. Temperature amplitudes are generally only a few Kelvin but occasional bursts of up to 10 K have been observed. Observations of the wave in summer are sometimes consistent with the suggestion of ducting from the winter hemisphere. |
format |
Article in Journal/Newspaper |
author |
K. A. Day N. J. Mitchell |
author_facet |
K. A. Day N. J. Mitchell |
author_sort |
K. A. Day |
title |
The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere |
title_short |
The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere |
title_full |
The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere |
title_fullStr |
The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere |
title_full_unstemmed |
The 16-day wave in the Arctic and Antarctic mesosphere and lower thermosphere |
title_sort |
16-day wave in the arctic and antarctic mesosphere and lower thermosphere |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doaj.org/article/e25a95be62e24c3bae5b084eee615d67 |
long_lat |
ENVELOPE(21.117,21.117,67.883,67.883) ENVELOPE(-68.130,-68.130,-67.568,-67.568) |
geographic |
Antarctic Arctic Esrange Rothera The Antarctic |
geographic_facet |
Antarctic Arctic Esrange Rothera The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 10, Iss 3, Pp 1461-1472 (2010) |
op_relation |
http://www.atmos-chem-phys.net/10/1461/2010/acp-10-1461-2010.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/e25a95be62e24c3bae5b084eee615d67 |
_version_ |
1766265707741315072 |