Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2
This paper describes global characteristics of the westward-propagating planetary wave with a period of ∼4 days and zonal wavenumber 2, here referred to as quasi-4-day wave (Q4DW), which is considered to be a manifestation of the (2,1) Rossby normal mode. A climatology of the Q4DW is derived from ge...
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ftdlr:oai:elib.dlr.de:143039 2023-07-23T04:17:56+02:00 Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2 Yamazaki, Yosuke Matthias, Vivien Miyoshi, Yasunobu 2021-06-23 application/pdf https://elib.dlr.de/143039/ https://elib.dlr.de/143039/2/Yamazaki_JGR_2021.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021JD034855 en eng Wiley https://elib.dlr.de/143039/2/Yamazaki_JGR_2021.pdf Yamazaki, Yosuke und Matthias, Vivien und Miyoshi, Yasunobu (2021) Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2. Journal of Geophysical Research: Atmospheres. Wiley. doi:10.1029/2021JD034855 <https://doi.org/10.1029/2021JD034855>. ISSN 2169-897X. cc_by Solar-Terrestrische Kopplungsprozesse Zeitschriftenbeitrag PeerReviewed 2021 ftdlr https://doi.org/10.1029/2021JD034855 2023-07-02T23:20:16Z This paper describes global characteristics of the westward-propagating planetary wave with a period of ∼4 days and zonal wavenumber 2, here referred to as quasi-4-day wave (Q4DW), which is considered to be a manifestation of the (2,1) Rossby normal mode. A climatology of the Q4DW is derived from geopotential height measurements by the Aura Microwave Limb Sounder during August 2004–December 2020. In the mesosphere and lower thermosphere (MLT), amplitude maxima occur at mid latitudes in May and August in the Northern Hemisphere, and in February and November in the Southern Hemisphere. With the amplitude exceeding 300 m, the Q4DW sometimes becomes the dominant mode of traveling planetary waves in the MLT. The seasonal variation is largely determined by the zonal mean state. As predicted by previous modeling work, the amplitude grows rapidly with height on the equatorward side of the critical layer, where the zonal mean flow is weakly eastward relative to the wave. The wave growth can be particularly large when there is a region of unstable mean flow across the boundary of the critical layer. This condition is met not only during the seasonal amplification of the Q4DW but also during some Arctic sudden stratospheric warming events, leading to an unseasonal enhancement. This article is protected by copyright. All rights reserved. Article in Journal/Newspaper Arctic German Aerospace Center: elib - DLR electronic library Arctic Journal of Geophysical Research: Atmospheres 126 13 |
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Open Polar |
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German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
English |
topic |
Solar-Terrestrische Kopplungsprozesse |
spellingShingle |
Solar-Terrestrische Kopplungsprozesse Yamazaki, Yosuke Matthias, Vivien Miyoshi, Yasunobu Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2 |
topic_facet |
Solar-Terrestrische Kopplungsprozesse |
description |
This paper describes global characteristics of the westward-propagating planetary wave with a period of ∼4 days and zonal wavenumber 2, here referred to as quasi-4-day wave (Q4DW), which is considered to be a manifestation of the (2,1) Rossby normal mode. A climatology of the Q4DW is derived from geopotential height measurements by the Aura Microwave Limb Sounder during August 2004–December 2020. In the mesosphere and lower thermosphere (MLT), amplitude maxima occur at mid latitudes in May and August in the Northern Hemisphere, and in February and November in the Southern Hemisphere. With the amplitude exceeding 300 m, the Q4DW sometimes becomes the dominant mode of traveling planetary waves in the MLT. The seasonal variation is largely determined by the zonal mean state. As predicted by previous modeling work, the amplitude grows rapidly with height on the equatorward side of the critical layer, where the zonal mean flow is weakly eastward relative to the wave. The wave growth can be particularly large when there is a region of unstable mean flow across the boundary of the critical layer. This condition is met not only during the seasonal amplification of the Q4DW but also during some Arctic sudden stratospheric warming events, leading to an unseasonal enhancement. This article is protected by copyright. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Yamazaki, Yosuke Matthias, Vivien Miyoshi, Yasunobu |
author_facet |
Yamazaki, Yosuke Matthias, Vivien Miyoshi, Yasunobu |
author_sort |
Yamazaki, Yosuke |
title |
Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2 |
title_short |
Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2 |
title_full |
Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2 |
title_fullStr |
Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2 |
title_full_unstemmed |
Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2 |
title_sort |
quasi-4-day wave: atmospheric manifestation of the first symmetric rossby normal mode of zonal wavenumber 2 |
publisher |
Wiley |
publishDate |
2021 |
url |
https://elib.dlr.de/143039/ https://elib.dlr.de/143039/2/Yamazaki_JGR_2021.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021JD034855 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
https://elib.dlr.de/143039/2/Yamazaki_JGR_2021.pdf Yamazaki, Yosuke und Matthias, Vivien und Miyoshi, Yasunobu (2021) Quasi-4-day Wave: Atmospheric Manifestation of the First Symmetric Rossby Normal Mode of Zonal Wavenumber 2. Journal of Geophysical Research: Atmospheres. Wiley. doi:10.1029/2021JD034855 <https://doi.org/10.1029/2021JD034855>. ISSN 2169-897X. |
op_rights |
cc_by |
op_doi |
https://doi.org/10.1029/2021JD034855 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
126 |
container_issue |
13 |
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1772180024433049600 |