Barotropic instability of basic states with a realistic jet and a wave
The stability of basic states consisting of a jet similar to the stratospheric polar night jet and a traveling wave with a single zonal wavenumber is examined in a linearized nondivergent barotropic model on a sphere. Basic state waves are chosen to resemble observed traveling and stationary feature...
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1989
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ftnasantrs:oai:casi.ntrs.nasa.gov:19890052726 2023-05-15T18:02:16+02:00 Barotropic instability of basic states with a realistic jet and a wave Manney, Gloria L. Nathan, Terrence R. Stanford, John L. Unclassified, Unlimited, Publicly available May 1, 1989 http://ntrs.nasa.gov/search.jsp?R=19890052726 unknown http://ntrs.nasa.gov/search.jsp?R=19890052726 Accession ID: 89A40097 Copyright Other Sources 47 Journal of the Atmospheric Sciences; 46; 1250-127 1989 ftnasantrs 2012-02-15T18:03:49Z The stability of basic states consisting of a jet similar to the stratospheric polar night jet and a traveling wave with a single zonal wavenumber is examined in a linearized nondivergent barotropic model on a sphere. Basic state waves are chosen to resemble observed traveling and stationary features in the winter stratosphere. Results are presented for disturbance growth rates, propagation characteristics, and energy conversion as a function of the basic state wave amplitude. The effects of small amplitude basic state waves on unstable disturbances arising from a zonally symmetric jet are discussed; results are shown where a small amplitude basic state wave dramatically affects the stability characteristics. Evidence is shown that the presence of a traveling wave may favor the appearance of disturbances that include other zonal wavenumbers which move with the basic state wave; this result is discussed in relation to the origin of observed quasi-nondispersive features in the polar winter stratosphere. Results for a stationary wavenumber 1 basic state wave suggest that a distorted polar vortex may be unstable to disturbances that would lead to further distortion. An unstable disturbance for a basic state with an eastward moving wavenumber 2 has components which resemble, in period and location, traveling waves that are observed in the winter stratosphere. Other/Unknown Material polar night NASA Technical Reports Server (NTRS) |
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47 Manney, Gloria L. Nathan, Terrence R. Stanford, John L. Barotropic instability of basic states with a realistic jet and a wave |
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47 |
description |
The stability of basic states consisting of a jet similar to the stratospheric polar night jet and a traveling wave with a single zonal wavenumber is examined in a linearized nondivergent barotropic model on a sphere. Basic state waves are chosen to resemble observed traveling and stationary features in the winter stratosphere. Results are presented for disturbance growth rates, propagation characteristics, and energy conversion as a function of the basic state wave amplitude. The effects of small amplitude basic state waves on unstable disturbances arising from a zonally symmetric jet are discussed; results are shown where a small amplitude basic state wave dramatically affects the stability characteristics. Evidence is shown that the presence of a traveling wave may favor the appearance of disturbances that include other zonal wavenumbers which move with the basic state wave; this result is discussed in relation to the origin of observed quasi-nondispersive features in the polar winter stratosphere. Results for a stationary wavenumber 1 basic state wave suggest that a distorted polar vortex may be unstable to disturbances that would lead to further distortion. An unstable disturbance for a basic state with an eastward moving wavenumber 2 has components which resemble, in period and location, traveling waves that are observed in the winter stratosphere. |
format |
Other/Unknown Material |
author |
Manney, Gloria L. Nathan, Terrence R. Stanford, John L. |
author_facet |
Manney, Gloria L. Nathan, Terrence R. Stanford, John L. |
author_sort |
Manney, Gloria L. |
title |
Barotropic instability of basic states with a realistic jet and a wave |
title_short |
Barotropic instability of basic states with a realistic jet and a wave |
title_full |
Barotropic instability of basic states with a realistic jet and a wave |
title_fullStr |
Barotropic instability of basic states with a realistic jet and a wave |
title_full_unstemmed |
Barotropic instability of basic states with a realistic jet and a wave |
title_sort |
barotropic instability of basic states with a realistic jet and a wave |
publishDate |
1989 |
url |
http://ntrs.nasa.gov/search.jsp?R=19890052726 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
polar night |
genre_facet |
polar night |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19890052726 Accession ID: 89A40097 |
op_rights |
Copyright |
_version_ |
1766172062323310592 |