Quantification of waves in lidar observations of noctilucent clouds at scales from seconds to minutes
We present small-scale structures and waves observed in noctilucent clouds (NLC) by lidar at an unprecedented temporal resolution of 30 s or less. The measurements were taken with the Rayleigh/Mie/Raman lidar at the ALOMAR observatory in northern Norway (69 N) in the years 2008-2011. We find multipl...
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ftleibnizopen:oai:oai.leibnizopen.de:giBKrIcBdbrxVwz6bVaN 2023-06-11T04:15:21+02:00 Quantification of waves in lidar observations of noctilucent clouds at scales from seconds to minutes Kaifler, N. Baumgarten, G. Fiedler, J. 2013 application/pdf https://doi.org/10.34657/4267 https://oa.tib.eu/renate/handle/123456789/5638 eng eng Göttingen : Copernicus CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ Atmospheric Chemistry and Physics 13 (2013), 23 amplitude brightness temperature displacement gravity wave lidar Mie theory polar mesospheric cloud Raman spectroscopy Rayleigh wave Norway 550 article Text 2013 ftleibnizopen https://doi.org/10.34657/4267 2023-04-23T23:13:22Z We present small-scale structures and waves observed in noctilucent clouds (NLC) by lidar at an unprecedented temporal resolution of 30 s or less. The measurements were taken with the Rayleigh/Mie/Raman lidar at the ALOMAR observatory in northern Norway (69 N) in the years 2008-2011. We find multiple layer NLC in 7.9% of the time for a brightness threshold of δ β 12 × 10-10 m-1 sr-1. In comparison to 10 min averaged data, the 30 s dataset shows considerably more structure. For limited periods, quasi-monochromatic waves in NLC altitude variations are common, in accord with ground-based NLC imagery. For the combined dataset, on the other hand, we do not find preferred periods but rather significant periods at all timescales observed (1 min to 1 h). Typical wave amplitudes in the layer vertical displacements are 0.2 km with maximum amplitudes up to 2.3 km. Average spectral slopes of temporal altitude and brightness variations are-2.01 ± 0.25 for centroid altitude,-1.41 ± 0.24 for peak brightness and-1.73 ± 0.25 for integrated brightness. Evaluating a new single-pulse detection system, we observe altitude variations of 70 s period and spectral slopes down to a scale of 10 s. We evaluate the suitability of NLC parameters as tracers for gravity waves. publishedVersion Article in Journal/Newspaper Northern Norway LeibnizOpen (The Leibniz Association) Alomar ENVELOPE(-67.083,-67.083,-68.133,-68.133) Norway |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
amplitude brightness temperature displacement gravity wave lidar Mie theory polar mesospheric cloud Raman spectroscopy Rayleigh wave Norway 550 |
spellingShingle |
amplitude brightness temperature displacement gravity wave lidar Mie theory polar mesospheric cloud Raman spectroscopy Rayleigh wave Norway 550 Kaifler, N. Baumgarten, G. Fiedler, J. Quantification of waves in lidar observations of noctilucent clouds at scales from seconds to minutes |
topic_facet |
amplitude brightness temperature displacement gravity wave lidar Mie theory polar mesospheric cloud Raman spectroscopy Rayleigh wave Norway 550 |
description |
We present small-scale structures and waves observed in noctilucent clouds (NLC) by lidar at an unprecedented temporal resolution of 30 s or less. The measurements were taken with the Rayleigh/Mie/Raman lidar at the ALOMAR observatory in northern Norway (69 N) in the years 2008-2011. We find multiple layer NLC in 7.9% of the time for a brightness threshold of δ β 12 × 10-10 m-1 sr-1. In comparison to 10 min averaged data, the 30 s dataset shows considerably more structure. For limited periods, quasi-monochromatic waves in NLC altitude variations are common, in accord with ground-based NLC imagery. For the combined dataset, on the other hand, we do not find preferred periods but rather significant periods at all timescales observed (1 min to 1 h). Typical wave amplitudes in the layer vertical displacements are 0.2 km with maximum amplitudes up to 2.3 km. Average spectral slopes of temporal altitude and brightness variations are-2.01 ± 0.25 for centroid altitude,-1.41 ± 0.24 for peak brightness and-1.73 ± 0.25 for integrated brightness. Evaluating a new single-pulse detection system, we observe altitude variations of 70 s period and spectral slopes down to a scale of 10 s. We evaluate the suitability of NLC parameters as tracers for gravity waves. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Kaifler, N. Baumgarten, G. Fiedler, J. |
author_facet |
Kaifler, N. Baumgarten, G. Fiedler, J. |
author_sort |
Kaifler, N. |
title |
Quantification of waves in lidar observations of noctilucent clouds at scales from seconds to minutes |
title_short |
Quantification of waves in lidar observations of noctilucent clouds at scales from seconds to minutes |
title_full |
Quantification of waves in lidar observations of noctilucent clouds at scales from seconds to minutes |
title_fullStr |
Quantification of waves in lidar observations of noctilucent clouds at scales from seconds to minutes |
title_full_unstemmed |
Quantification of waves in lidar observations of noctilucent clouds at scales from seconds to minutes |
title_sort |
quantification of waves in lidar observations of noctilucent clouds at scales from seconds to minutes |
publisher |
Göttingen : Copernicus |
publishDate |
2013 |
url |
https://doi.org/10.34657/4267 https://oa.tib.eu/renate/handle/123456789/5638 |
long_lat |
ENVELOPE(-67.083,-67.083,-68.133,-68.133) |
geographic |
Alomar Norway |
geographic_facet |
Alomar Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
Atmospheric Chemistry and Physics 13 (2013), 23 |
op_rights |
CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.34657/4267 |
_version_ |
1768372101621743616 |