Study of Acoustic-Gravity Wave Spectra in the Atmosphere Using Mesosphere-Stratosphere- Troposphere Radar (Propagation, Universal Spectrum)
Scheffler, Albert O.
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/69349
Description
Title
Study of Acoustic-Gravity Wave Spectra in the Atmosphere Using Mesosphere-Stratosphere- Troposphere Radar (Propagation, Universal Spectrum)
Author(s)
Scheffler, Albert O.
Issue Date
1986
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Abstract
Current research indicates that acoustic-gravity waves can greatly influence the large-scale dynamics of the middle atmosphere. The morphology and structure of the atmospheric processes which cause this phenomenon can be better understood by the study of acoustic-gravity wave spectra. In order to use the meso-scale wind fluctuation data measured by MST radars to investigate such spectra, it is necessary to apply the relation between the observed wind fluctuation spectrum and the wave spectrum. The correct relationship is quantitatively derived in this study, based on acoustic-gravity wave theory and radar observation principle. Theoretical spectra are computed for a vertically and azimuthally symmetric wave model and also for a more general asymmetric model. Examples are given to show how the theoretical results can be used to interpret the one-dimensional observational data as well as to derive parameters for the model wave spectrum. The Doppler shift produced by the presence of a horizontal background wind is also examined since it leads to a redistribution of power in the observed frequency spectrum. The model is also generalized in order to determine the conditions for which the extended radar beam-width can affect the observed spectrum. An interpretation is further made of a two-dimensional observed spectrum by comparison to the two-dimensional model spectrum. The theoretical results are used to propose additional tests for the consistency of the acoustic-gravity wave model for atmospheric wind fluctuations.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
