Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway
We present observations obtained with the Middle Atmosphere Alomar Radar System (MAARSY) to investigate short-period wave-like features using polar mesospheric summer echoes (PMSEs) as a tracer for the neutral dynamics. We conducted a multibeam experiment including 67 different beam directions durin...
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ftdoajarticles:oai:doaj.org/article:987cc6584db449beba0d717c04e29631 2023-05-15T13:25:18+02:00 Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway G. Stober S. Sommer C. Schult R. Latteck J. L. Chau 2018-05-01T00:00:00Z https://doi.org/10.5194/acp-18-6721-2018 https://doaj.org/article/987cc6584db449beba0d717c04e29631 EN eng Copernicus Publications https://www.atmos-chem-phys.net/18/6721/2018/acp-18-6721-2018.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-18-6721-2018 1680-7316 1680-7324 https://doaj.org/article/987cc6584db449beba0d717c04e29631 Atmospheric Chemistry and Physics, Vol 18, Pp 6721-6732 (2018) Physics QC1-999 Chemistry QD1-999 article 2018 ftdoajarticles https://doi.org/10.5194/acp-18-6721-2018 2022-12-31T03:25:48Z We present observations obtained with the Middle Atmosphere Alomar Radar System (MAARSY) to investigate short-period wave-like features using polar mesospheric summer echoes (PMSEs) as a tracer for the neutral dynamics. We conducted a multibeam experiment including 67 different beam directions during a 9-day campaign in June 2013. We identified two Kelvin–Helmholtz instability (KHI) events from the signal morphology of PMSE. The MAARSY observations are complemented by collocated meteor radar wind data to determine the mesoscale gravity wave activity and the vertical structure of the wind field above the PMSE. The KHIs occurred in a strong shear flow with Richardson numbers Ri < 0.25. In addition, we observed 15 wave-like events in our MAARSY multibeam observations applying a sophisticated decomposition of the radial velocity measurements using volume velocity processing. We retrieved the horizontal wavelength, intrinsic frequency, propagation direction, and phase speed from the horizontally resolved wind variability for 15 events. These events showed horizontal wavelengths between 20 and 40 km, vertical wavelengths between 5 and 10 km, and rather high intrinsic phase speeds between 45 and 85 m s −1 with intrinsic periods of 5–10 min. Article in Journal/Newspaper Andenes Northern Norway Directory of Open Access Journals: DOAJ Articles Norway Alomar ENVELOPE(-67.083,-67.083,-68.133,-68.133) Atmospheric Chemistry and Physics 18 9 6721 6732 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 G. Stober S. Sommer C. Schult R. Latteck J. L. Chau Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
We present observations obtained with the Middle Atmosphere Alomar Radar System (MAARSY) to investigate short-period wave-like features using polar mesospheric summer echoes (PMSEs) as a tracer for the neutral dynamics. We conducted a multibeam experiment including 67 different beam directions during a 9-day campaign in June 2013. We identified two Kelvin–Helmholtz instability (KHI) events from the signal morphology of PMSE. The MAARSY observations are complemented by collocated meteor radar wind data to determine the mesoscale gravity wave activity and the vertical structure of the wind field above the PMSE. The KHIs occurred in a strong shear flow with Richardson numbers Ri < 0.25. In addition, we observed 15 wave-like events in our MAARSY multibeam observations applying a sophisticated decomposition of the radial velocity measurements using volume velocity processing. We retrieved the horizontal wavelength, intrinsic frequency, propagation direction, and phase speed from the horizontally resolved wind variability for 15 events. These events showed horizontal wavelengths between 20 and 40 km, vertical wavelengths between 5 and 10 km, and rather high intrinsic phase speeds between 45 and 85 m s −1 with intrinsic periods of 5–10 min. |
format |
Article in Journal/Newspaper |
author |
G. Stober S. Sommer C. Schult R. Latteck J. L. Chau |
author_facet |
G. Stober S. Sommer C. Schult R. Latteck J. L. Chau |
author_sort |
G. Stober |
title |
Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway |
title_short |
Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway |
title_full |
Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway |
title_fullStr |
Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway |
title_full_unstemmed |
Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway |
title_sort |
observation of kelvin–helmholtz instabilities and gravity waves in the summer mesopause above andenes in northern norway |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-18-6721-2018 https://doaj.org/article/987cc6584db449beba0d717c04e29631 |
long_lat |
ENVELOPE(-67.083,-67.083,-68.133,-68.133) |
geographic |
Norway Alomar |
geographic_facet |
Norway Alomar |
genre |
Andenes Northern Norway |
genre_facet |
Andenes Northern Norway |
op_source |
Atmospheric Chemistry and Physics, Vol 18, Pp 6721-6732 (2018) |
op_relation |
https://www.atmos-chem-phys.net/18/6721/2018/acp-18-6721-2018.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-18-6721-2018 1680-7316 1680-7324 https://doaj.org/article/987cc6584db449beba0d717c04e29631 |
op_doi |
https://doi.org/10.5194/acp-18-6721-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
9 |
container_start_page |
6721 |
op_container_end_page |
6732 |
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1766384562428968960 |