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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Online Access: | https://doi.org/10.34657/1136 https://oa.tib.eu/renate/handle/123456789/879 |
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ftleibnizopen:oai:oai.leibnizopen.de:wh6CMYsBBwLIz6xG3iaC 2023-11-12T04:01:03+01:00 Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway Stober, Gunter Sommer, Svenja Schult, Carsten Latteck, Ralph Chau, Jorge L. 2018 application/pdf https://doi.org/10.34657/1136 https://oa.tib.eu/renate/handle/123456789/879 eng eng München : European Geopyhsical Union CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ Atmospheric Chemistry and Physics, Volume 18, Issue 9, Page 6721-6732 550 article Text 2018 ftleibnizopen https://doi.org/10.34657/1136 2023-10-15T23:19:49Z 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 40km, vertical wavelengths between 5 and 10km, and rather high intrinsic phase speeds between 45 and 85ms−1 with intrinsic periods of 5–10min. Leibniz_Fonds publishedVersion Article in Journal/Newspaper Andenes Northern Norway Unknown Alomar ENVELOPE(-67.083,-67.083,-68.133,-68.133) Norway |
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Open Polar |
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ftleibnizopen |
language |
English |
topic |
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spellingShingle |
550 Stober, Gunter Sommer, Svenja Schult, Carsten Latteck, Ralph Chau, Jorge L. Observation of Kelvin–Helmholtz instabilities and gravity waves in the summer mesopause above Andenes in Northern Norway |
topic_facet |
550 |
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 40km, vertical wavelengths between 5 and 10km, and rather high intrinsic phase speeds between 45 and 85ms−1 with intrinsic periods of 5–10min. Leibniz_Fonds publishedVersion |
format |
Article in Journal/Newspaper |
author |
Stober, Gunter Sommer, Svenja Schult, Carsten Latteck, Ralph Chau, Jorge L. |
author_facet |
Stober, Gunter Sommer, Svenja Schult, Carsten Latteck, Ralph Chau, Jorge L. |
author_sort |
Stober, Gunter |
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 |
München : European Geopyhsical Union |
publishDate |
2018 |
url |
https://doi.org/10.34657/1136 https://oa.tib.eu/renate/handle/123456789/879 |
long_lat |
ENVELOPE(-67.083,-67.083,-68.133,-68.133) |
geographic |
Alomar Norway |
geographic_facet |
Alomar Norway |
genre |
Andenes Northern Norway |
genre_facet |
Andenes Northern Norway |
op_source |
Atmospheric Chemistry and Physics, Volume 18, Issue 9, Page 6721-6732 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.34657/1136 |
_version_ |
1782329481409593344 |