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 (75.6S, 26.6W) have been used to estimate the seasonal variation of the vertical fluxes of horizontal momentum carried by highfrequency atmospheric gravity waves. The cross-correla...
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ftutahsudc:oai:digitalcommons.usu.edu:physics_facpub-2198 2023-05-15T13:54:20+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, Michael J. American Geophysical Union 2004-12-01T08:00:00Z application/pdf https://digitalcommons.usu.edu/physics_facpub/1199 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2198&context=physics_facpub unknown Hosted by Utah State University Libraries https://digitalcommons.usu.edu/physics_facpub/1199 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2198&context=physics_facpub Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. PDM All Physics Faculty Publications gravity wave momentum flux Antarctic mesosphere Physics text 2004 ftutahsudc 2022-03-07T22:24:23Z Airglow imager and dynasonde/imaging Doppler interferometer (IDI) radar wind measurements at Halley Station, Antarctica (75.6S, 26.6W) have been used to estimate the seasonal variation of the vertical fluxes of horizontal momentum carried by highfrequency 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. Text Antarc* Antarctic Antarctica Utah State University: DigitalCommons@USU Antarctic Austral Halley Station ENVELOPE(-26.541,-26.541,-75.581,-75.581) The Antarctic |
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Utah State University: DigitalCommons@USU |
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language |
unknown |
topic |
gravity wave momentum flux Antarctic mesosphere Physics |
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gravity wave momentum flux Antarctic mesosphere Physics Espy, P. J. Jones, G. O.L. Swenson, G. R. Tang, J. Taylor, Michael J. Seasonal Variations of the Gravity Wave Momentum Flux in the Antarctic Mesosphere and Lower Thermosphere |
topic_facet |
gravity wave momentum flux Antarctic mesosphere Physics |
description |
Airglow imager and dynasonde/imaging Doppler interferometer (IDI) radar wind measurements at Halley Station, Antarctica (75.6S, 26.6W) have been used to estimate the seasonal variation of the vertical fluxes of horizontal momentum carried by highfrequency 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. |
author2 |
American Geophysical Union |
format |
Text |
author |
Espy, P. J. Jones, G. O.L. Swenson, G. R. Tang, J. Taylor, Michael J. |
author_facet |
Espy, P. J. Jones, G. O.L. Swenson, G. R. Tang, J. Taylor, Michael 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 |
Hosted by Utah State University Libraries |
publishDate |
2004 |
url |
https://digitalcommons.usu.edu/physics_facpub/1199 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2198&context=physics_facpub |
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_source |
All Physics Faculty Publications |
op_relation |
https://digitalcommons.usu.edu/physics_facpub/1199 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2198&context=physics_facpub |
op_rights |
Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact the Institutional Repository Librarian at digitalcommons@usu.edu. |
op_rightsnorm |
PDM |
_version_ |
1766260044678037504 |