Tidal Modulation of the Gravitywave Momentum Flux in the Antarctic Mesosphere
Airglow imager and dynasonde/IDI radar wind measurements at Halley Station, Antarctica (76S, 27W) have been used to estimate the diurnal variation of the vertical fluxes of horizontal momentum carried by highfrequency atmospheric gravity waves. The cross-correlation coefficients between the vertical...
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ftutahsudc:oai:digitalcommons.usu.edu:physics_facpub-2197 2023-05-15T13:34:48+02:00 Tidal Modulation of the Gravitywave Momentum Flux in the Antarctic Mesosphere Espy, P. J. Jones, G. O.L. Swenson, G. R. Tang, J. Taylor, Michael J. American Geophysical Union 2004-06-01T07:00:00Z application/pdf https://digitalcommons.usu.edu/physics_facpub/1198 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2197&context=physics_facpub unknown Hosted by Utah State University Libraries https://digitalcommons.usu.edu/physics_facpub/1198 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2197&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 Tidal Modulation Gravitywave Momentum Flux Physics text 2004 ftutahsudc 2022-03-07T22:26:29Z Airglow imager and dynasonde/IDI radar wind measurements at Halley Station, Antarctica (76S, 27W) have been used to estimate the diurnal 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 the sodium airglow imager data collected during four consecutive nights of near total darkness during July of 2000. These were combined with wind-velocity variances from coincident radar measurements to estimate the upper limit of the vertical flux of horizontal momentum during three-hour intervals throughout the period. The resulting momentum flux showed a marked semi-diurnal oscillation in the zonal and meridional components. Calculations of the momentum flux through the Na airglow show variations in period and phase consistent with the observations, implying that tidal propagation and modulated gravity-wave forcing may both affect observed wind variations. INDEX TERMS: 3332 Meteorology and Atmospheric Dynamics: Mesospheric dynamics; 3334 Meteorology and Atmospheric Dynamics: Middle atmosphere dynamics (0341, 0342); 3384 Meteorology and Atmospheric Dynamics: Waves and tides. Text Antarc* Antarctic Antarctica Utah State University: DigitalCommons@USU Antarctic 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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unknown |
topic |
Tidal Modulation Gravitywave Momentum Flux Physics |
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Tidal Modulation Gravitywave Momentum Flux Physics Espy, P. J. Jones, G. O.L. Swenson, G. R. Tang, J. Taylor, Michael J. Tidal Modulation of the Gravitywave Momentum Flux in the Antarctic Mesosphere |
topic_facet |
Tidal Modulation Gravitywave Momentum Flux Physics |
description |
Airglow imager and dynasonde/IDI radar wind measurements at Halley Station, Antarctica (76S, 27W) have been used to estimate the diurnal 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 the sodium airglow imager data collected during four consecutive nights of near total darkness during July of 2000. These were combined with wind-velocity variances from coincident radar measurements to estimate the upper limit of the vertical flux of horizontal momentum during three-hour intervals throughout the period. The resulting momentum flux showed a marked semi-diurnal oscillation in the zonal and meridional components. Calculations of the momentum flux through the Na airglow show variations in period and phase consistent with the observations, implying that tidal propagation and modulated gravity-wave forcing may both affect observed wind variations. INDEX TERMS: 3332 Meteorology and Atmospheric Dynamics: Mesospheric dynamics; 3334 Meteorology and Atmospheric Dynamics: Middle atmosphere dynamics (0341, 0342); 3384 Meteorology and Atmospheric Dynamics: Waves and tides. |
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 |
Tidal Modulation of the Gravitywave Momentum Flux in the Antarctic Mesosphere |
title_short |
Tidal Modulation of the Gravitywave Momentum Flux in the Antarctic Mesosphere |
title_full |
Tidal Modulation of the Gravitywave Momentum Flux in the Antarctic Mesosphere |
title_fullStr |
Tidal Modulation of the Gravitywave Momentum Flux in the Antarctic Mesosphere |
title_full_unstemmed |
Tidal Modulation of the Gravitywave Momentum Flux in the Antarctic Mesosphere |
title_sort |
tidal modulation of the gravitywave momentum flux in the antarctic mesosphere |
publisher |
Hosted by Utah State University Libraries |
publishDate |
2004 |
url |
https://digitalcommons.usu.edu/physics_facpub/1198 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2197&context=physics_facpub |
long_lat |
ENVELOPE(-26.541,-26.541,-75.581,-75.581) |
geographic |
Antarctic Halley Station The Antarctic |
geographic_facet |
Antarctic 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/1198 https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=2197&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. |
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PDM |
_version_ |
1766057618459066368 |