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 and diurnal and semidiurnal tidal amplitude and phases, as well as the Reynolds stress components during 2019, utilizing meteor radars at six Southern Hemisphere locations ranging from midlatitudes to polar latitudes. These include...
Published in: | Annales Geophysicae |
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Language: | English |
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2021
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Online Access: | https://doi.org/10.5194/angeo-39-1-2021 https://doaj.org/article/f86f38a16b8a47e1a8b87f616dac5b35 |
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ftdoajarticles:oai:doaj.org/article:f86f38a16b8a47e1a8b87f616dac5b35 2023-05-15T18:21:29+02:00 Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere–lower thermosphere in 2019 G. Stober D. Janches V. Matthias D. Fritts J. Marino T. Moffat-Griffin K. Baumgarten W. Lee D. Murphy Y. H. Kim N. Mitchell S. Palo 2021-01-01T00:00:00Z https://doi.org/10.5194/angeo-39-1-2021 https://doaj.org/article/f86f38a16b8a47e1a8b87f616dac5b35 EN eng Copernicus Publications https://angeo.copernicus.org/articles/39/1/2021/angeo-39-1-2021.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-39-1-2021 0992-7689 1432-0576 https://doaj.org/article/f86f38a16b8a47e1a8b87f616dac5b35 Annales Geophysicae, Vol 39, Pp 1-29 (2021) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2021 ftdoajarticles https://doi.org/10.5194/angeo-39-1-2021 2022-12-31T07:25:00Z In this study we explore the seasonal variability of the mean winds and diurnal and semidiurnal tidal amplitude and phases, as well as the Reynolds stress components during 2019, utilizing meteor radars at six Southern Hemisphere locations ranging from midlatitudes 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 behavior 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 Directory of Open Access Journals: DOAJ Articles Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) South Georgia Island ENVELOPE(-36.750,-36.750,-54.250,-54.250) King Sejong Station ENVELOPE(-58.783,-58.783,-62.220,-62.220) King Edward Point ENVELOPE(-36.496,-36.496,-54.284,-54.284) Annales Geophysicae 39 1 1 29 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 G. Stober D. Janches V. Matthias D. Fritts J. Marino T. Moffat-Griffin K. Baumgarten W. Lee D. Murphy Y. H. Kim N. Mitchell S. Palo Seasonal evolution of winds, atmospheric tides, and Reynolds stress components in the Southern Hemisphere mesosphere–lower thermosphere in 2019 |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
In this study we explore the seasonal variability of the mean winds and diurnal and semidiurnal tidal amplitude and phases, as well as the Reynolds stress components during 2019, utilizing meteor radars at six Southern Hemisphere locations ranging from midlatitudes 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 behavior 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. |
format |
Article in Journal/Newspaper |
author |
G. Stober D. Janches V. Matthias D. Fritts J. Marino T. Moffat-Griffin K. Baumgarten W. Lee D. Murphy Y. H. Kim N. Mitchell S. Palo |
author_facet |
G. Stober D. Janches V. Matthias D. Fritts J. Marino T. Moffat-Griffin K. Baumgarten W. Lee D. Murphy Y. H. Kim N. Mitchell S. Palo |
author_sort |
G. Stober |
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 |
2021 |
url |
https://doi.org/10.5194/angeo-39-1-2021 https://doaj.org/article/f86f38a16b8a47e1a8b87f616dac5b35 |
long_lat |
ENVELOPE(-68.130,-68.130,-67.568,-67.568) ENVELOPE(-36.750,-36.750,-54.250,-54.250) ENVELOPE(-58.783,-58.783,-62.220,-62.220) ENVELOPE(-36.496,-36.496,-54.284,-54.284) |
geographic |
Rothera South Georgia Island King Sejong Station King Edward Point |
geographic_facet |
Rothera South Georgia Island King Sejong Station King Edward Point |
genre |
South Georgia Island Tierra del Fuego |
genre_facet |
South Georgia Island Tierra del Fuego |
op_source |
Annales Geophysicae, Vol 39, Pp 1-29 (2021) |
op_relation |
https://angeo.copernicus.org/articles/39/1/2021/angeo-39-1-2021.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-39-1-2021 0992-7689 1432-0576 https://doaj.org/article/f86f38a16b8a47e1a8b87f616dac5b35 |
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 |
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1766200789543419904 |