Short-period planetary waves in the Antarctic middle atmosphere
Planetary waves with periods between two and four days in the middle atmosphere over Antarctica are characterized using one year of data from the medium-frequency spaced antenna (MFSA) radars at Scott Base, Rothera, and Davis. In order to investigate the origin of the observed waves, the ground-base...
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ftnerc:oai:nora.nerc.ac.uk:5728 2024-06-09T07:39:29+00:00 Short-period planetary waves in the Antarctic middle atmosphere Baumgaertner, A.J.G. McDonald, A.J. Hibbins, R.E. Fritts, D.C. Murphy, D.J. Vincent, R.A. 2008 http://nora.nerc.ac.uk/id/eprint/5728/ https://doi.org/10.1016/j.jastp.2008.04.007 unknown Elsevier Baumgaertner, A.J.G.; McDonald, A.J.; Hibbins, R.E. orcid:0000-0002-6867-2255 Fritts, D.C.; Murphy, D.J.; Vincent, R.A. 2008 Short-period planetary waves in the Antarctic middle atmosphere. Journal of Atmospheric and Solar-Terrestrial Physics, 70 (10). 1336-1350. https://doi.org/10.1016/j.jastp.2008.04.007 <https://doi.org/10.1016/j.jastp.2008.04.007> Meteorology and Climatology Physics Atmospheric Sciences Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1016/j.jastp.2008.04.007 2024-05-15T08:49:44Z Planetary waves with periods between two and four days in the middle atmosphere over Antarctica are characterized using one year of data from the medium-frequency spaced antenna (MFSA) radars at Scott Base, Rothera, and Davis. In order to investigate the origin of the observed waves, the ground-based data are complemented by temperature measurements from the Earth Observing System Microwave Limb Sounder (EOS MLS) instrument on the Aura satellite as well as wind velocity data from the United Kingdom Met. Office (UKMO) stratospheric assimilation. Observed characteristics of waves with a period of approximately two days in summer are consistent with the quasi-two-day wave (QTDW) generally found after the summer solstice at low- and mid-latitudes. The Scott Base observations of the QTDW presented here are the highest-latitude ground-based observations of this wave to date. Waves with preferred periods of two and four days occur in bursts throughout the winter with maximum activity in June, July, and August. The mean of the two- and four-day wave amplitudes is relatively constant, suggesting constant wave forcing. When several waves with different periods occur at the same time, they often have similar phase velocities, supporting suggestions that they are quasi-non-dispersive. In 2005, a “warmpool” lasts from late July to late August. An alternative interpretation of this phenomenon is the presence of a structure propagating with the background wind. Consideration of the role of vertical shear (baroclinic instabilities) and horizontal shear (barotropic instabilities) of the zonal wind suggests that instabilities are likely to play a role in the forcing of the two- and four-day waves, which are near-resonant modes and thus supported by the atmosphere. Article in Journal/Newspaper Antarc* Antarctic Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) Scott Base ENVELOPE(166.766,166.766,-77.849,-77.849) The Antarctic Journal of Atmospheric and Solar-Terrestrial Physics 70 10 1336 1350 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Meteorology and Climatology Physics Atmospheric Sciences |
spellingShingle |
Meteorology and Climatology Physics Atmospheric Sciences Baumgaertner, A.J.G. McDonald, A.J. Hibbins, R.E. Fritts, D.C. Murphy, D.J. Vincent, R.A. Short-period planetary waves in the Antarctic middle atmosphere |
topic_facet |
Meteorology and Climatology Physics Atmospheric Sciences |
description |
Planetary waves with periods between two and four days in the middle atmosphere over Antarctica are characterized using one year of data from the medium-frequency spaced antenna (MFSA) radars at Scott Base, Rothera, and Davis. In order to investigate the origin of the observed waves, the ground-based data are complemented by temperature measurements from the Earth Observing System Microwave Limb Sounder (EOS MLS) instrument on the Aura satellite as well as wind velocity data from the United Kingdom Met. Office (UKMO) stratospheric assimilation. Observed characteristics of waves with a period of approximately two days in summer are consistent with the quasi-two-day wave (QTDW) generally found after the summer solstice at low- and mid-latitudes. The Scott Base observations of the QTDW presented here are the highest-latitude ground-based observations of this wave to date. Waves with preferred periods of two and four days occur in bursts throughout the winter with maximum activity in June, July, and August. The mean of the two- and four-day wave amplitudes is relatively constant, suggesting constant wave forcing. When several waves with different periods occur at the same time, they often have similar phase velocities, supporting suggestions that they are quasi-non-dispersive. In 2005, a “warmpool” lasts from late July to late August. An alternative interpretation of this phenomenon is the presence of a structure propagating with the background wind. Consideration of the role of vertical shear (baroclinic instabilities) and horizontal shear (barotropic instabilities) of the zonal wind suggests that instabilities are likely to play a role in the forcing of the two- and four-day waves, which are near-resonant modes and thus supported by the atmosphere. |
format |
Article in Journal/Newspaper |
author |
Baumgaertner, A.J.G. McDonald, A.J. Hibbins, R.E. Fritts, D.C. Murphy, D.J. Vincent, R.A. |
author_facet |
Baumgaertner, A.J.G. McDonald, A.J. Hibbins, R.E. Fritts, D.C. Murphy, D.J. Vincent, R.A. |
author_sort |
Baumgaertner, A.J.G. |
title |
Short-period planetary waves in the Antarctic middle atmosphere |
title_short |
Short-period planetary waves in the Antarctic middle atmosphere |
title_full |
Short-period planetary waves in the Antarctic middle atmosphere |
title_fullStr |
Short-period planetary waves in the Antarctic middle atmosphere |
title_full_unstemmed |
Short-period planetary waves in the Antarctic middle atmosphere |
title_sort |
short-period planetary waves in the antarctic middle atmosphere |
publisher |
Elsevier |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/5728/ https://doi.org/10.1016/j.jastp.2008.04.007 |
long_lat |
ENVELOPE(-68.130,-68.130,-67.568,-67.568) ENVELOPE(166.766,166.766,-77.849,-77.849) |
geographic |
Antarctic Rothera Scott Base The Antarctic |
geographic_facet |
Antarctic Rothera Scott Base The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
Baumgaertner, A.J.G.; McDonald, A.J.; Hibbins, R.E. orcid:0000-0002-6867-2255 Fritts, D.C.; Murphy, D.J.; Vincent, R.A. 2008 Short-period planetary waves in the Antarctic middle atmosphere. Journal of Atmospheric and Solar-Terrestrial Physics, 70 (10). 1336-1350. https://doi.org/10.1016/j.jastp.2008.04.007 <https://doi.org/10.1016/j.jastp.2008.04.007> |
op_doi |
https://doi.org/10.1016/j.jastp.2008.04.007 |
container_title |
Journal of Atmospheric and Solar-Terrestrial Physics |
container_volume |
70 |
container_issue |
10 |
container_start_page |
1336 |
op_container_end_page |
1350 |
_version_ |
1801379908412243968 |