author_facet Yamazaki, Y.
Matthias, V.
Yamazaki, Y.
Matthias, V.
author Yamazaki, Y.
Matthias, V.
spellingShingle Yamazaki, Y.
Matthias, V.
Journal of Geophysical Research: Atmospheres
Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
Space and Planetary Science
Earth and Planetary Sciences (miscellaneous)
Atmospheric Science
Geophysics
author_sort yamazaki, y.
spelling Yamazaki, Y. Matthias, V. 2169-897X 2169-8996 American Geophysical Union (AGU) Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics http://dx.doi.org/10.1029/2019jd030634 <jats:title>Abstract</jats:title><jats:p>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.</jats:p> Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings Journal of Geophysical Research: Atmospheres
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series Journal of Geophysical Research: Atmospheres
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title Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_unstemmed Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_full Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_fullStr Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_full_unstemmed Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_short Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_sort large‐amplitude quasi‐10‐day waves in the middle atmosphere during final warmings
topic Space and Planetary Science
Earth and Planetary Sciences (miscellaneous)
Atmospheric Science
Geophysics
url http://dx.doi.org/10.1029/2019jd030634
publishDate 2019
physical 9874-9892
description <jats:title>Abstract</jats:title><jats:p>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.</jats:p>
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author Yamazaki, Y., Matthias, V.
author_facet Yamazaki, Y., Matthias, V., Yamazaki, Y., Matthias, V.
author_sort yamazaki, y.
container_issue 17-18
container_start_page 9874
container_title Journal of Geophysical Research: Atmospheres
container_volume 124
description <jats:title>Abstract</jats:title><jats:p>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.</jats:p>
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imprint_str_mv American Geophysical Union (AGU), 2019
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spelling Yamazaki, Y. Matthias, V. 2169-897X 2169-8996 American Geophysical Union (AGU) Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics http://dx.doi.org/10.1029/2019jd030634 <jats:title>Abstract</jats:title><jats:p>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.</jats:p> Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings Journal of Geophysical Research: Atmospheres
spellingShingle Yamazaki, Y., Matthias, V., Journal of Geophysical Research: Atmospheres, Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geophysics
title Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_full Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_fullStr Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_full_unstemmed Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_short Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
title_sort large‐amplitude quasi‐10‐day waves in the middle atmosphere during final warmings
title_unstemmed Large‐Amplitude Quasi‐10‐Day Waves in the Middle Atmosphere During Final Warmings
topic Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geophysics
url http://dx.doi.org/10.1029/2019jd030634