Spontaneous inertia‐gravity wave emission from a nonlinear critical layer in the stratosphere
Abstract Using a nonlinear global primitive equation model, spontaneous inertia‐gravity wave (IGW) emission is investigated in an idealized representation of the stratospheric polar night. It is shown that IGWs are spontaneously emitted in the interior of the fluid in a jet exit region that develops...
Published in: | Quarterly Journal of the Royal Meteorological Society |
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crwiley:10.1002/qj.3750 2024-06-02T08:13:30+00:00 Spontaneous inertia‐gravity wave emission from a nonlinear critical layer in the stratosphere Polichtchouk, Inna Scott, Richard K. 2020 http://dx.doi.org/10.1002/qj.3750 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.3750 https://onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3750 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/qj.3750 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3750 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Quarterly Journal of the Royal Meteorological Society volume 146, issue 728, page 1516-1528 ISSN 0035-9009 1477-870X journal-article 2020 crwiley https://doi.org/10.1002/qj.3750 2024-05-06T07:04:08Z Abstract Using a nonlinear global primitive equation model, spontaneous inertia‐gravity wave (IGW) emission is investigated in an idealized representation of the stratospheric polar night. It is shown that IGWs are spontaneously emitted in the interior of the fluid in a jet exit region that develops around a nonlinear Rossby wave critical layer. Two key ingredients for the generation are identified: the presence of a Rossby wave guide on the polar night jet; and a zero wind line on the jet flank that gives rise to nonlinear Rossby wave breaking and strong distortion of the flow. The emission of IGWs appears here as a quasi‐steady process that begins at a well‐defined time when the flow deformation becomes large enough. Part of the emitted IGWs undergoes wave capture by the cat's‐eye flow in a Rossby wave critical layer. Another part – in the form of a well‐defined IGW packet – escapes the wave capture limit, and propagates away into the far field. The propagating wave packet is numerically well‐converged to increases in both vertical and horizontal resolution and thus provides an ideal test bed for understanding IGW emission and informing non‐orographic gravity wave drag parametrization design. Article in Journal/Newspaper polar night Wiley Online Library Quarterly Journal of the Royal Meteorological Society 146 728 1516 1528 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Using a nonlinear global primitive equation model, spontaneous inertia‐gravity wave (IGW) emission is investigated in an idealized representation of the stratospheric polar night. It is shown that IGWs are spontaneously emitted in the interior of the fluid in a jet exit region that develops around a nonlinear Rossby wave critical layer. Two key ingredients for the generation are identified: the presence of a Rossby wave guide on the polar night jet; and a zero wind line on the jet flank that gives rise to nonlinear Rossby wave breaking and strong distortion of the flow. The emission of IGWs appears here as a quasi‐steady process that begins at a well‐defined time when the flow deformation becomes large enough. Part of the emitted IGWs undergoes wave capture by the cat's‐eye flow in a Rossby wave critical layer. Another part – in the form of a well‐defined IGW packet – escapes the wave capture limit, and propagates away into the far field. The propagating wave packet is numerically well‐converged to increases in both vertical and horizontal resolution and thus provides an ideal test bed for understanding IGW emission and informing non‐orographic gravity wave drag parametrization design. |
format |
Article in Journal/Newspaper |
author |
Polichtchouk, Inna Scott, Richard K. |
spellingShingle |
Polichtchouk, Inna Scott, Richard K. Spontaneous inertia‐gravity wave emission from a nonlinear critical layer in the stratosphere |
author_facet |
Polichtchouk, Inna Scott, Richard K. |
author_sort |
Polichtchouk, Inna |
title |
Spontaneous inertia‐gravity wave emission from a nonlinear critical layer in the stratosphere |
title_short |
Spontaneous inertia‐gravity wave emission from a nonlinear critical layer in the stratosphere |
title_full |
Spontaneous inertia‐gravity wave emission from a nonlinear critical layer in the stratosphere |
title_fullStr |
Spontaneous inertia‐gravity wave emission from a nonlinear critical layer in the stratosphere |
title_full_unstemmed |
Spontaneous inertia‐gravity wave emission from a nonlinear critical layer in the stratosphere |
title_sort |
spontaneous inertia‐gravity wave emission from a nonlinear critical layer in the stratosphere |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/qj.3750 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fqj.3750 https://onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3750 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/qj.3750 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/qj.3750 |
genre |
polar night |
genre_facet |
polar night |
op_source |
Quarterly Journal of the Royal Meteorological Society volume 146, issue 728, page 1516-1528 ISSN 0035-9009 1477-870X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/qj.3750 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
146 |
container_issue |
728 |
container_start_page |
1516 |
op_container_end_page |
1528 |
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1800737028823842816 |