Wavelet analysis of stratospheric gravity wave packets over Macquarie Island 2. Intermittency and mean-flow accelerations
We calculate the mean-flow accelerations due to gravity wave packets observed in the lower stratosphere over Macquarie Island (55°S, 159°E) between February 1994 and April 1995. The parameters of the wave packets were extracted from twice-daily radiosonde soundings using a wavelet-based analysis met...
Published in: | Journal of Geophysical Research: Atmospheres |
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Amer Geophysical Union
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Online Access: | http://hdl.handle.net/2440/12561 https://doi.org/10.1029/2000JD900846 |
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/12561 2023-05-15T17:09:55+02:00 Wavelet analysis of stratospheric gravity wave packets over Macquarie Island 2. Intermittency and mean-flow accelerations Zink, F. Vincent, R. 2001 application/pdf http://hdl.handle.net/2440/12561 https://doi.org/10.1029/2000JD900846 en eng Amer Geophysical Union Journal of Geophysical Research, 2001; 106(D10):10289-10297 0148-0227 http://hdl.handle.net/2440/12561 doi:10.1029/2000JD900846 Vincent, R. [0000-0001-6559-6544] Copyright 2001 by the American Geophysical Union. Journal article 2001 ftunivadelaidedl https://doi.org/10.1029/2000JD900846 2023-02-06T07:09:41Z We calculate the mean-flow accelerations due to gravity wave packets observed in the lower stratosphere over Macquarie Island (55°S, 159°E) between February 1994 and April 1995. The parameters of the wave packets were extracted from twice-daily radiosonde soundings using a wavelet-based analysis method introduced by Zink and Vincent [this issue]. The deduced wave parameters are used to directly compute momentum flux profiles in the lower stratosphere, and the shortcomings of this approach to assess mean-flow accelerations are discussed. We then use the observed wave packets as an input spectrum in a linear ray-tracing model. The vertical extent of the detected wave packets allows us to define an expression for wave intermittency, which enables us to compute zonal accelerations in the stratosphere and mesosphere. In the stratosphere the waves produce an acceleration of the mean flow, in accordance with predictions. In the mesosphere the inferred wave drag is 2–3 times larger than previous observational and theoretical estimates. Florian Zink and R. A. Vincent Article in Journal/Newspaper Macquarie Island The University of Adelaide: Digital Library Journal of Geophysical Research: Atmospheres 106 D10 10289 10297 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
description |
We calculate the mean-flow accelerations due to gravity wave packets observed in the lower stratosphere over Macquarie Island (55°S, 159°E) between February 1994 and April 1995. The parameters of the wave packets were extracted from twice-daily radiosonde soundings using a wavelet-based analysis method introduced by Zink and Vincent [this issue]. The deduced wave parameters are used to directly compute momentum flux profiles in the lower stratosphere, and the shortcomings of this approach to assess mean-flow accelerations are discussed. We then use the observed wave packets as an input spectrum in a linear ray-tracing model. The vertical extent of the detected wave packets allows us to define an expression for wave intermittency, which enables us to compute zonal accelerations in the stratosphere and mesosphere. In the stratosphere the waves produce an acceleration of the mean flow, in accordance with predictions. In the mesosphere the inferred wave drag is 2–3 times larger than previous observational and theoretical estimates. Florian Zink and R. A. Vincent |
format |
Article in Journal/Newspaper |
author |
Zink, F. Vincent, R. |
spellingShingle |
Zink, F. Vincent, R. Wavelet analysis of stratospheric gravity wave packets over Macquarie Island 2. Intermittency and mean-flow accelerations |
author_facet |
Zink, F. Vincent, R. |
author_sort |
Zink, F. |
title |
Wavelet analysis of stratospheric gravity wave packets over Macquarie Island 2. Intermittency and mean-flow accelerations |
title_short |
Wavelet analysis of stratospheric gravity wave packets over Macquarie Island 2. Intermittency and mean-flow accelerations |
title_full |
Wavelet analysis of stratospheric gravity wave packets over Macquarie Island 2. Intermittency and mean-flow accelerations |
title_fullStr |
Wavelet analysis of stratospheric gravity wave packets over Macquarie Island 2. Intermittency and mean-flow accelerations |
title_full_unstemmed |
Wavelet analysis of stratospheric gravity wave packets over Macquarie Island 2. Intermittency and mean-flow accelerations |
title_sort |
wavelet analysis of stratospheric gravity wave packets over macquarie island 2. intermittency and mean-flow accelerations |
publisher |
Amer Geophysical Union |
publishDate |
2001 |
url |
http://hdl.handle.net/2440/12561 https://doi.org/10.1029/2000JD900846 |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_relation |
Journal of Geophysical Research, 2001; 106(D10):10289-10297 0148-0227 http://hdl.handle.net/2440/12561 doi:10.1029/2000JD900846 Vincent, R. [0000-0001-6559-6544] |
op_rights |
Copyright 2001 by the American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2000JD900846 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
106 |
container_issue |
D10 |
container_start_page |
10289 |
op_container_end_page |
10297 |
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1766066289647812608 |