Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere
Airglow imager and dynasonde/imaging Doppler interferometer (IDI) radar wind measurements at Halley Station, Antarctica (75.6degreesS, 26.6degreesW) have been used to estimate the seasonal variation of the vertical fluxes of horizontal momentum carried by high-frequency atmospheric gravity waves. Th...
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2004
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ftnerc:oai:nora.nerc.ac.uk:12162 2023-05-15T13:45:10+02:00 Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere Espy, P.J. Jones, G.O.L. Swenson, G.R. Tang, J. Taylor, M.J. 2004 text http://nora.nerc.ac.uk/id/eprint/12162/ https://nora.nerc.ac.uk/id/eprint/12162/1/2003JD004446.pdf http://www.agu.org/journals/jd/jd0423/2003JD004446/ en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/12162/1/2003JD004446.pdf Espy, P.J.; Jones, G.O.L.; Swenson, G.R.; Tang, J.; Taylor, M.J. 2004 Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere. Journal of Geophysical Research, 109 (D23), D23109. 9, pp. https://doi.org/10.1029/2003JD004446 <https://doi.org/10.1029/2003JD004446> Atmospheric Sciences Publication - Article PeerReviewed 2004 ftnerc https://doi.org/10.1029/2003JD004446 2023-02-04T19:27:47Z Airglow imager and dynasonde/imaging Doppler interferometer (IDI) radar wind measurements at Halley Station, Antarctica (75.6degreesS, 26.6degreesW) have been used to estimate the seasonal variation of the vertical fluxes of horizontal momentum carried by high-frequency atmospheric gravity waves. The cross-correlation coefficients between the vertical and horizontal wind perturbations were calculated from sodium (Na) airglow imager data collected during the austral winter seasons of 2000 and 2001. These were combined with wind velocity variances from coincident radar measurements to estimate the daily averaged upper limit of the vertical flux of horizontal momentum due to gravity waves. The resulting momentum flux at the Na airglow altitudes, while displaying a large day-to-day variability, showed a marked rotation from the northwest to the southeast throughout the winter season. Calculations show that this rotation is consistent with seasonal changes in the wind field filtering of gravity waves below the Na airglow region. The calculations also indicate that while the magnitude of the meridional wind is small, this filtering leads to the observed seasonal changes in the meridional momentum flux. Article in Journal/Newspaper Antarc* Antarctic Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic Austral Halley Station ENVELOPE(-26.541,-26.541,-75.581,-75.581) The Antarctic Journal of Geophysical Research: Atmospheres 109 D23 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Atmospheric Sciences |
spellingShingle |
Atmospheric Sciences Espy, P.J. Jones, G.O.L. Swenson, G.R. Tang, J. Taylor, M.J. Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere |
topic_facet |
Atmospheric Sciences |
description |
Airglow imager and dynasonde/imaging Doppler interferometer (IDI) radar wind measurements at Halley Station, Antarctica (75.6degreesS, 26.6degreesW) have been used to estimate the seasonal variation of the vertical fluxes of horizontal momentum carried by high-frequency atmospheric gravity waves. The cross-correlation coefficients between the vertical and horizontal wind perturbations were calculated from sodium (Na) airglow imager data collected during the austral winter seasons of 2000 and 2001. These were combined with wind velocity variances from coincident radar measurements to estimate the daily averaged upper limit of the vertical flux of horizontal momentum due to gravity waves. The resulting momentum flux at the Na airglow altitudes, while displaying a large day-to-day variability, showed a marked rotation from the northwest to the southeast throughout the winter season. Calculations show that this rotation is consistent with seasonal changes in the wind field filtering of gravity waves below the Na airglow region. The calculations also indicate that while the magnitude of the meridional wind is small, this filtering leads to the observed seasonal changes in the meridional momentum flux. |
format |
Article in Journal/Newspaper |
author |
Espy, P.J. Jones, G.O.L. Swenson, G.R. Tang, J. Taylor, M.J. |
author_facet |
Espy, P.J. Jones, G.O.L. Swenson, G.R. Tang, J. Taylor, M.J. |
author_sort |
Espy, P.J. |
title |
Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere |
title_short |
Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere |
title_full |
Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere |
title_fullStr |
Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere |
title_full_unstemmed |
Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere |
title_sort |
seasonal variations of the gravity wave momentum flux in the antarctic mesosphere and lower thermosphere |
publisher |
American Geophysical Union |
publishDate |
2004 |
url |
http://nora.nerc.ac.uk/id/eprint/12162/ https://nora.nerc.ac.uk/id/eprint/12162/1/2003JD004446.pdf http://www.agu.org/journals/jd/jd0423/2003JD004446/ |
long_lat |
ENVELOPE(-26.541,-26.541,-75.581,-75.581) |
geographic |
Antarctic Austral Halley Station The Antarctic |
geographic_facet |
Antarctic Austral Halley Station The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/12162/1/2003JD004446.pdf Espy, P.J.; Jones, G.O.L.; Swenson, G.R.; Tang, J.; Taylor, M.J. 2004 Seasonal variations of the gravity wave momentum flux in the Antarctic mesosphere and lower thermosphere. Journal of Geophysical Research, 109 (D23), D23109. 9, pp. https://doi.org/10.1029/2003JD004446 <https://doi.org/10.1029/2003JD004446> |
op_doi |
https://doi.org/10.1029/2003JD004446 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
109 |
container_issue |
D23 |
_version_ |
1766214935309713408 |