Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019
In this study we explore the seasonal variability of the mean winds, diurnal, semidiurnal tidal amplitude and phases as well as the Reynolds stress components during 2019, utilizing meteor radars at six southern hemisphere locations ranging from mid- to polar latitudes. These include Tierra del Fueg...
Published in: | Annales Geophysicae |
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Language: | English |
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2020
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Online Access: | https://elib.dlr.de/138641/ https://elib.dlr.de/138641/2/Momentum_flux_southern_hemisphere%20%281%29.pdf https://angeo.copernicus.org/preprints/angeo-2020-55/ |
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ftdlr:oai:elib.dlr.de:138641 2023-07-16T04:00:53+02:00 Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019 Stober, G. Janches, D. Matthias, V. Fritts, D. Marino, J. Moffat-Griffin, T. Baumgarten, K. Lee, W. Murphy, D. Kim, Y. H. Mitchell, N. Palo, S. Stober, Gunter 2020 application/pdf https://elib.dlr.de/138641/ https://elib.dlr.de/138641/2/Momentum_flux_southern_hemisphere%20%281%29.pdf https://angeo.copernicus.org/preprints/angeo-2020-55/ en eng Copernicus Publications https://elib.dlr.de/138641/2/Momentum_flux_southern_hemisphere%20%281%29.pdf Stober, G. und Janches, D. und Matthias, V. und Fritts, D. und Marino, J. und Moffat-Griffin, T. und Baumgarten, K. und Lee, W. und Murphy, D. und Kim, Y. H. und Mitchell, N. und Palo, S. (2020) Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019. Annales Geophysicae, 2020, Seiten 1-39. Copernicus Publications. doi:10.5194/angeo-39-1-2021 <https://doi.org/10.5194/angeo-39-1-2021>. ISSN 0992-7689. cc_by Solar-Terrestrische Kopplungsprozesse Zeitschriftenbeitrag PeerReviewed 2020 ftdlr https://doi.org/10.5194/angeo-39-1-2021 2023-06-27T08:28:36Z In this study we explore the seasonal variability of the mean winds, diurnal, semidiurnal tidal amplitude and phases as well as the Reynolds stress components during 2019, utilizing meteor radars at six southern hemisphere locations ranging from mid- to polar latitudes. These include Tierra del Fuego, King Edward Point on South Georgia island, King Sejong Station, Rothera, Davis and McMurdo stations. The year 2019 was exceptional in the southern hemisphere, due to the occurrence of a rare minor stratospheric warming in September. Our results show a substantial longitudinal and latitudinal seasonal variability of mean winds and tides pointing towards a wobbling and asymmetric polar vortex. Furthermore, the derived momentum fluxes and wind variances, utilizing a recently developed algorithm, reveal a characteristic seasonal pattern at each location included in this study. The longitudinal and latitudinal variability of vertical flux of zonal and meridional momentum is discussed in the context of polar vortex asymmetry, spatial and temporal variability, and the longitude and latitude dependence of the vertical propagation conditions of gravity waves. The horizontal momentum fluxes exhibit a rather consistent seasonal structure between the stations while the wind variances indicate a clear seasonal behaviour and altitude dependence showing the largest values at higher altitudes during the hemispheric winter and two variance minima during the equinoxes. Also the hemispheric summer mesopause and the zonal wind reversal can be identified in the wind variances. Article in Journal/Newspaper South Georgia Island Tierra del Fuego German Aerospace Center: elib - DLR electronic library King Edward Point ENVELOPE(-36.496,-36.496,-54.284,-54.284) King Sejong Station ENVELOPE(-58.783,-58.783,-62.220,-62.220) Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) South Georgia Island ENVELOPE(-36.750,-36.750,-54.250,-54.250) Annales Geophysicae 39 1 1 29 |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
English |
topic |
Solar-Terrestrische Kopplungsprozesse |
spellingShingle |
Solar-Terrestrische Kopplungsprozesse Stober, G. Janches, D. Matthias, V. Fritts, D. Marino, J. Moffat-Griffin, T. Baumgarten, K. Lee, W. Murphy, D. Kim, Y. H. Mitchell, N. Palo, S. Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019 |
topic_facet |
Solar-Terrestrische Kopplungsprozesse |
description |
In this study we explore the seasonal variability of the mean winds, diurnal, semidiurnal tidal amplitude and phases as well as the Reynolds stress components during 2019, utilizing meteor radars at six southern hemisphere locations ranging from mid- to polar latitudes. These include Tierra del Fuego, King Edward Point on South Georgia island, King Sejong Station, Rothera, Davis and McMurdo stations. The year 2019 was exceptional in the southern hemisphere, due to the occurrence of a rare minor stratospheric warming in September. Our results show a substantial longitudinal and latitudinal seasonal variability of mean winds and tides pointing towards a wobbling and asymmetric polar vortex. Furthermore, the derived momentum fluxes and wind variances, utilizing a recently developed algorithm, reveal a characteristic seasonal pattern at each location included in this study. The longitudinal and latitudinal variability of vertical flux of zonal and meridional momentum is discussed in the context of polar vortex asymmetry, spatial and temporal variability, and the longitude and latitude dependence of the vertical propagation conditions of gravity waves. The horizontal momentum fluxes exhibit a rather consistent seasonal structure between the stations while the wind variances indicate a clear seasonal behaviour and altitude dependence showing the largest values at higher altitudes during the hemispheric winter and two variance minima during the equinoxes. Also the hemispheric summer mesopause and the zonal wind reversal can be identified in the wind variances. |
author2 |
Stober, Gunter |
format |
Article in Journal/Newspaper |
author |
Stober, G. Janches, D. Matthias, V. Fritts, D. Marino, J. Moffat-Griffin, T. Baumgarten, K. Lee, W. Murphy, D. Kim, Y. H. Mitchell, N. Palo, S. |
author_facet |
Stober, G. Janches, D. Matthias, V. Fritts, D. Marino, J. Moffat-Griffin, T. Baumgarten, K. Lee, W. Murphy, D. Kim, Y. H. Mitchell, N. Palo, S. |
author_sort |
Stober, G. |
title |
Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019 |
title_short |
Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019 |
title_full |
Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019 |
title_fullStr |
Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019 |
title_full_unstemmed |
Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019 |
title_sort |
seasonal evolution of winds, atmospheric tides, and reynolds stress components in the southern hemisphere mesosphere - lower thermosphere in 2019 |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://elib.dlr.de/138641/ https://elib.dlr.de/138641/2/Momentum_flux_southern_hemisphere%20%281%29.pdf https://angeo.copernicus.org/preprints/angeo-2020-55/ |
long_lat |
ENVELOPE(-36.496,-36.496,-54.284,-54.284) ENVELOPE(-58.783,-58.783,-62.220,-62.220) ENVELOPE(-68.130,-68.130,-67.568,-67.568) ENVELOPE(-36.750,-36.750,-54.250,-54.250) |
geographic |
King Edward Point King Sejong Station Rothera South Georgia Island |
geographic_facet |
King Edward Point King Sejong Station Rothera South Georgia Island |
genre |
South Georgia Island Tierra del Fuego |
genre_facet |
South Georgia Island Tierra del Fuego |
op_relation |
https://elib.dlr.de/138641/2/Momentum_flux_southern_hemisphere%20%281%29.pdf Stober, G. und Janches, D. und Matthias, V. und Fritts, D. und Marino, J. und Moffat-Griffin, T. und Baumgarten, K. und Lee, W. und Murphy, D. und Kim, Y. H. und Mitchell, N. und Palo, S. (2020) Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere - lower thermosphere in 2019. Annales Geophysicae, 2020, Seiten 1-39. Copernicus Publications. doi:10.5194/angeo-39-1-2021 <https://doi.org/10.5194/angeo-39-1-2021>. ISSN 0992-7689. |
op_rights |
cc_by |
op_doi |
https://doi.org/10.5194/angeo-39-1-2021 |
container_title |
Annales Geophysicae |
container_volume |
39 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
29 |
_version_ |
1771550230310813696 |