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  Large-amplitude quasi-10-day waves in the middle atmosphere during final warmings

Yamazaki, Y., Matthias, V. (2019): Large-amplitude quasi-10-day waves in the middle atmosphere during final warmings. - Journal of Geophysical Research: Atmospheres, 124, 17-18, 9874-9892.
https://doi.org/10.1029/2019JD030634

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Yamazaki, Y.1, Author
Matthias, Vivien2, Author              
Affiliations:
1Potsdam Institute for Climate Impact Research and Cooperation Partners, ou_persistent13              
2Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: Geopotential height measurements from the Aura Microwave Limb Sounder between 9‐ and 97‐km altitudes during 2004–2018 are used to examine long‐period (3–20 days) wave activity during the Northern Hemisphere winter and spring, with the primary focus on the response of normal mode Rossby waves in the middle atmosphere to sudden stratospheric warmings (SSWs). Unusually large westward propagating waves with Zonal Wave Number 1 and period ∼10 days are observed at 55° latitude at the stratopause height (∼48 km) and above following final warmings of 2016, 2015, and 2005. In each case, large‐amplitude waves are observed for the duration of two to three wave cycles. Characteristics of the waves are in conformity with the second antisymmetric Rossby normal mode of Zonal Wave Number 1, or the quasi‐10‐day wave. The growth rate of the waves is significantly greater than the classical normal mode in the upper stratosphere (approximately 30–50 km) where instability conditions are met, indicating the amplification or excitation of the waves in that region. The response of the quasi‐10‐day wave during midwinter SSWs, and also during the spring transition without an SSW, is not as obvious as the wave response during final warmings. The results suggest that not only the occurrence of SSW but also the seasonal timing of SSW is an important factor for the transient variability of the quasi‐10‐day wave in the middle atmosphere.

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 Dates: 2019
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2019JD030634
PIKDOMAIN: RD1 - Earth System Analysis
eDoc: 8586
Research topic keyword: Atmosphere
Model / method: Nonlinear Data Analysis
Regional keyword: Global
Organisational keyword: RD1 - Earth System Analysis
Working Group: Earth System Modes of Operation
 Degree: -

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Title: Journal of Geophysical Research: Atmospheres
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 124 (17-18) Sequence Number: - Start / End Page: 9874 - 9892 Identifier: ISSN: 2169-897X
Other: Wiley
Other: American Geophysical Union (AGU)
Other: 2169-8996
CoNE: https://publications.pik-potsdam.de/cone/journals/resource/jgr_atmospheres