Case study of wave breaking with high-resolution turbulence measurements with LITOS and WRF simulations
Measurements of turbulent energy dissipation rates obtained from wind fluctuations observed with the balloon-borne instrument LITOS (Leibniz-Institute Turbulence Observations in the Stratosphere) are combined with simulations with the Weather Research and Forecasting (WRF) model to study the breakdo...
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ftleibnizopen:oai:oai.leibnizopen.de:7dlPoYoBbHMkKcxz4_PG 2023-10-09T21:53:13+02:00 Case study of wave breaking with high-resolution turbulence measurements with LITOS and WRF simulations Schneider, Andreas Wagner, Johannes Söder, Jens Gerding, Michael Lübken, Franz-Josef 2017 application/pdf https://doi.org/10.34657/814 https://oa.tib.eu/renate/handle/123456789/792 eng eng München : European Geopyhsical Union CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ Atmospheric Chemistry and Physics, Volume 17, Issue 12, Page 7941-7954 550 article Text 2017 ftleibnizopen https://doi.org/10.34657/814 2023-09-17T23:33:43Z Measurements of turbulent energy dissipation rates obtained from wind fluctuations observed with the balloon-borne instrument LITOS (Leibniz-Institute Turbulence Observations in the Stratosphere) are combined with simulations with the Weather Research and Forecasting (WRF) model to study the breakdown of waves into turbulence. One flight from Kiruna (68° N, 21° E) and two flights from Kühlungsborn (54° N, 12° E) are analysed. Dissipation rates are of the order of 0. 1 mW kg−1 (∼ 0.01 K d−1) in the troposphere and in the stratosphere below 15 km, increasing in distinct layers by about 2 orders of magnitude. For one flight covering the stratosphere up to ∼ 28 km, the measurement shows nearly no turbulence at all above 15 km. Another flight features a patch with highly increased dissipation directly below the tropopause, collocated with strong wind shear and wave filtering conditions. In general, small or even negative Richardson numbers are affirmed to be a sufficient condition for increased dissipation. Conversely, significant turbulence has also been observed in the lower stratosphere under stable conditions. Observed energy dissipation rates are related to wave patterns visible in the modelled vertical winds. In particular, the drop in turbulent fraction at 15 km mentioned above coincides with a drop in amplitude in the wave patterns visible in the WRF. This indicates wave saturation being visible in the LITOS turbulence data. publishedVersion Article in Journal/Newspaper Kiruna LeibnizOpen (The Leibniz Association) Kiruna |
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English |
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550 Schneider, Andreas Wagner, Johannes Söder, Jens Gerding, Michael Lübken, Franz-Josef Case study of wave breaking with high-resolution turbulence measurements with LITOS and WRF simulations |
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description |
Measurements of turbulent energy dissipation rates obtained from wind fluctuations observed with the balloon-borne instrument LITOS (Leibniz-Institute Turbulence Observations in the Stratosphere) are combined with simulations with the Weather Research and Forecasting (WRF) model to study the breakdown of waves into turbulence. One flight from Kiruna (68° N, 21° E) and two flights from Kühlungsborn (54° N, 12° E) are analysed. Dissipation rates are of the order of 0. 1 mW kg−1 (∼ 0.01 K d−1) in the troposphere and in the stratosphere below 15 km, increasing in distinct layers by about 2 orders of magnitude. For one flight covering the stratosphere up to ∼ 28 km, the measurement shows nearly no turbulence at all above 15 km. Another flight features a patch with highly increased dissipation directly below the tropopause, collocated with strong wind shear and wave filtering conditions. In general, small or even negative Richardson numbers are affirmed to be a sufficient condition for increased dissipation. Conversely, significant turbulence has also been observed in the lower stratosphere under stable conditions. Observed energy dissipation rates are related to wave patterns visible in the modelled vertical winds. In particular, the drop in turbulent fraction at 15 km mentioned above coincides with a drop in amplitude in the wave patterns visible in the WRF. This indicates wave saturation being visible in the LITOS turbulence data. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Schneider, Andreas Wagner, Johannes Söder, Jens Gerding, Michael Lübken, Franz-Josef |
author_facet |
Schneider, Andreas Wagner, Johannes Söder, Jens Gerding, Michael Lübken, Franz-Josef |
author_sort |
Schneider, Andreas |
title |
Case study of wave breaking with high-resolution turbulence measurements with LITOS and WRF simulations |
title_short |
Case study of wave breaking with high-resolution turbulence measurements with LITOS and WRF simulations |
title_full |
Case study of wave breaking with high-resolution turbulence measurements with LITOS and WRF simulations |
title_fullStr |
Case study of wave breaking with high-resolution turbulence measurements with LITOS and WRF simulations |
title_full_unstemmed |
Case study of wave breaking with high-resolution turbulence measurements with LITOS and WRF simulations |
title_sort |
case study of wave breaking with high-resolution turbulence measurements with litos and wrf simulations |
publisher |
München : European Geopyhsical Union |
publishDate |
2017 |
url |
https://doi.org/10.34657/814 https://oa.tib.eu/renate/handle/123456789/792 |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
Kiruna |
genre_facet |
Kiruna |
op_source |
Atmospheric Chemistry and Physics, Volume 17, Issue 12, Page 7941-7954 |
op_rights |
CC BY 3.0 Unported https://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.34657/814 |
_version_ |
1779316459128750080 |