An investigation of the dynamics of the mesopause: Fabry-Perot observations of winds and temperatures from nightglow emissions
Dissertation (Ph.D.) University of Alaska Fairbanks, 1994 This work is a study of the behavior of tidal and planetary waves in the upper-middle atmosphere near the geographic south pole. This is accomplished with a characterization of the dynamic state of these motions. I used ground-based Fabry-Per...
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1994
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ftunivalaska:oai:scholarworks.alaska.edu:11122/9368 2023-05-15T18:23:17+02:00 An investigation of the dynamics of the mesopause: Fabry-Perot observations of winds and temperatures from nightglow emissions Conner, James F. Smith, R. W. 1994 http://hdl.handle.net/11122/9368 unknown http://hdl.handle.net/11122/9368 Physics Department Physics Atmospheric Science Optics Geophysics Dissertation phd 1994 ftunivalaska 2023-02-23T21:37:15Z Dissertation (Ph.D.) University of Alaska Fairbanks, 1994 This work is a study of the behavior of tidal and planetary waves in the upper-middle atmosphere near the geographic south pole. This is accomplished with a characterization of the dynamic state of these motions. I used ground-based Fabry-Perot Spectrometer (FPS) measurements of the multiple-line, $P\sb1$(2)$\sb{c,d}$, nightglow emissions from the X$\sp2$II band of the neutral OH* molecule. I developed analytical techniques to determine a space and time distribution of spectral amplitudes and phases for the dynamic parameters of kinetic temperature and neutral wind in the OH* layer. Spectral analysis of the variations in this layer indicate the existence of two groups: a planetary wave group (periods of ${\sim}$1-10 days), with eastward phase progression, and a near semi-diurnal group (periods of ${\sim}$8-13 hours), with westward phase progression. Specific periods vary slightly for different years; this is most likely due to remote propagation conditions. Further separation of each group shows the wind oscillations exhibit wave-number one behavior with associated wave-number zero temperature oscillations, (with a few exceptions). The periodicities in the planetary group neutral wind motions are consistent with the model results of Salby, 1984, for propagation to high latitudes through realistic mean flows. The characterization of the dynamics of this layer has led to the discovery of a basic azimuthal asymmetry in the distribution of spectral amplitude for a given oscillation, that is, preferred azimuths. These preferred azimuths appear to be associated with changes in the direction, not the amplitude, of a cross-polar mean wind. This finding, in conjunction with the evanescence of some features, uncovered two cases of planetary wave dissipation. These occur when oscillations attempt to maintain their preferred alignment with a changing mean wind direction resulting in a decay of wind amplitude and a burst of thermal oscillation. Both cases occur at ... Doctoral or Postdoctoral Thesis South pole Alaska University of Alaska: ScholarWorks@UA Fairbanks South Pole |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
unknown |
topic |
Physics Atmospheric Science Optics Geophysics |
spellingShingle |
Physics Atmospheric Science Optics Geophysics Conner, James F. An investigation of the dynamics of the mesopause: Fabry-Perot observations of winds and temperatures from nightglow emissions |
topic_facet |
Physics Atmospheric Science Optics Geophysics |
description |
Dissertation (Ph.D.) University of Alaska Fairbanks, 1994 This work is a study of the behavior of tidal and planetary waves in the upper-middle atmosphere near the geographic south pole. This is accomplished with a characterization of the dynamic state of these motions. I used ground-based Fabry-Perot Spectrometer (FPS) measurements of the multiple-line, $P\sb1$(2)$\sb{c,d}$, nightglow emissions from the X$\sp2$II band of the neutral OH* molecule. I developed analytical techniques to determine a space and time distribution of spectral amplitudes and phases for the dynamic parameters of kinetic temperature and neutral wind in the OH* layer. Spectral analysis of the variations in this layer indicate the existence of two groups: a planetary wave group (periods of ${\sim}$1-10 days), with eastward phase progression, and a near semi-diurnal group (periods of ${\sim}$8-13 hours), with westward phase progression. Specific periods vary slightly for different years; this is most likely due to remote propagation conditions. Further separation of each group shows the wind oscillations exhibit wave-number one behavior with associated wave-number zero temperature oscillations, (with a few exceptions). The periodicities in the planetary group neutral wind motions are consistent with the model results of Salby, 1984, for propagation to high latitudes through realistic mean flows. The characterization of the dynamics of this layer has led to the discovery of a basic azimuthal asymmetry in the distribution of spectral amplitude for a given oscillation, that is, preferred azimuths. These preferred azimuths appear to be associated with changes in the direction, not the amplitude, of a cross-polar mean wind. This finding, in conjunction with the evanescence of some features, uncovered two cases of planetary wave dissipation. These occur when oscillations attempt to maintain their preferred alignment with a changing mean wind direction resulting in a decay of wind amplitude and a burst of thermal oscillation. Both cases occur at ... |
author2 |
Smith, R. W. |
format |
Doctoral or Postdoctoral Thesis |
author |
Conner, James F. |
author_facet |
Conner, James F. |
author_sort |
Conner, James F. |
title |
An investigation of the dynamics of the mesopause: Fabry-Perot observations of winds and temperatures from nightglow emissions |
title_short |
An investigation of the dynamics of the mesopause: Fabry-Perot observations of winds and temperatures from nightglow emissions |
title_full |
An investigation of the dynamics of the mesopause: Fabry-Perot observations of winds and temperatures from nightglow emissions |
title_fullStr |
An investigation of the dynamics of the mesopause: Fabry-Perot observations of winds and temperatures from nightglow emissions |
title_full_unstemmed |
An investigation of the dynamics of the mesopause: Fabry-Perot observations of winds and temperatures from nightglow emissions |
title_sort |
investigation of the dynamics of the mesopause: fabry-perot observations of winds and temperatures from nightglow emissions |
publishDate |
1994 |
url |
http://hdl.handle.net/11122/9368 |
geographic |
Fairbanks South Pole |
geographic_facet |
Fairbanks South Pole |
genre |
South pole Alaska |
genre_facet |
South pole Alaska |
op_relation |
http://hdl.handle.net/11122/9368 Physics Department |
_version_ |
1766202838608773120 |