Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference
The High‐Altitude LOng Range research aircraft (HALO) encountered strong turbulence above Iceland at 13.8 km altitude on 13 October 2016. The generation of turbulence along the flight path is studied through numerical simulations in combination with the aircraft insitu observations. From the insitu...
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ftdlr:oai:elib.dlr.de:135251 2023-11-12T04:18:15+01:00 Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference Wilms, Henrike Bramberger, Martina Dörnbrack, Andreas 2020 application/pdf https://elib.dlr.de/135251/ https://elib.dlr.de/135251/1/qj.3848.pdf https://rmets.onlinelibrary.wiley.com/doi/10.1002/qj.3848 en eng Wiley https://elib.dlr.de/135251/1/qj.3848.pdf Wilms, Henrike und Bramberger, Martina und Dörnbrack, Andreas (2020) Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference. Quarterly Journal of the Royal Meteorological Society, 146 (732), Seiten 3326-3346. Wiley. doi:10.1002/qj.3848 <https://doi.org/10.1002/qj.3848>. ISSN 0035-9009. cc_by_nc_nd Verkehrsmeteorologie Institut für Physik der Atmosphäre Zeitschriftenbeitrag PeerReviewed 2020 ftdlr https://doi.org/10.1002/qj.3848 2023-10-30T00:23:57Z The High‐Altitude LOng Range research aircraft (HALO) encountered strong turbulence above Iceland at 13.8 km altitude on 13 October 2016. The generation of turbulence along the flight path is studied through numerical simulations in combination with the aircraft insitu observations. From the insitu observations, maximum energy dissipation rate values (cube root of the energy dissipation rate) of 0.39 m2/3 ·s-1 are obtained, which correspond to moderate to severe turbulence for a medium‐weight aircraft such as HALO. The turbulent region is characterized by observed large‐amplitude vertical wind fluctuations which coincide locally with a stagnation of the horizontal flow. The strong turbulence occurred downstream of and between the two Icelandic mountains Hofsjökull and Langjökull. High‐resolution numerical simulations, with realistic and idealized topography, show that the flow above these two nearby mountains is responsible for the observed turbulence. Vertically propagating hydrostatic mountain waves disperse horizontally in the region downstream and between Hofsjökull and Langjökull. There, both waves interfere and their superposition leads to enhanced amplitudes and, eventually, to convective instabilities. By comparing simulations with only one of the mountains to the simulation with both mountains, we infer that the wave interference can locally amplify the turbulence intensity by a factor of five and double the vertical extent of the turbulent region. Article in Journal/Newspaper Hofsjökull Iceland Langjökull German Aerospace Center: elib - DLR electronic library Langjökull ENVELOPE(-20.145,-20.145,64.654,64.654) Quarterly Journal of the Royal Meteorological Society 146 732 3326 3346 |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
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ftdlr |
language |
English |
topic |
Verkehrsmeteorologie Institut für Physik der Atmosphäre |
spellingShingle |
Verkehrsmeteorologie Institut für Physik der Atmosphäre Wilms, Henrike Bramberger, Martina Dörnbrack, Andreas Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference |
topic_facet |
Verkehrsmeteorologie Institut für Physik der Atmosphäre |
description |
The High‐Altitude LOng Range research aircraft (HALO) encountered strong turbulence above Iceland at 13.8 km altitude on 13 October 2016. The generation of turbulence along the flight path is studied through numerical simulations in combination with the aircraft insitu observations. From the insitu observations, maximum energy dissipation rate values (cube root of the energy dissipation rate) of 0.39 m2/3 ·s-1 are obtained, which correspond to moderate to severe turbulence for a medium‐weight aircraft such as HALO. The turbulent region is characterized by observed large‐amplitude vertical wind fluctuations which coincide locally with a stagnation of the horizontal flow. The strong turbulence occurred downstream of and between the two Icelandic mountains Hofsjökull and Langjökull. High‐resolution numerical simulations, with realistic and idealized topography, show that the flow above these two nearby mountains is responsible for the observed turbulence. Vertically propagating hydrostatic mountain waves disperse horizontally in the region downstream and between Hofsjökull and Langjökull. There, both waves interfere and their superposition leads to enhanced amplitudes and, eventually, to convective instabilities. By comparing simulations with only one of the mountains to the simulation with both mountains, we infer that the wave interference can locally amplify the turbulence intensity by a factor of five and double the vertical extent of the turbulent region. |
format |
Article in Journal/Newspaper |
author |
Wilms, Henrike Bramberger, Martina Dörnbrack, Andreas |
author_facet |
Wilms, Henrike Bramberger, Martina Dörnbrack, Andreas |
author_sort |
Wilms, Henrike |
title |
Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference |
title_short |
Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference |
title_full |
Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference |
title_fullStr |
Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference |
title_full_unstemmed |
Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference |
title_sort |
observation and simulation of mountain wave turbulence above iceland: turbulence intensification due to wave interference |
publisher |
Wiley |
publishDate |
2020 |
url |
https://elib.dlr.de/135251/ https://elib.dlr.de/135251/1/qj.3848.pdf https://rmets.onlinelibrary.wiley.com/doi/10.1002/qj.3848 |
long_lat |
ENVELOPE(-20.145,-20.145,64.654,64.654) |
geographic |
Langjökull |
geographic_facet |
Langjökull |
genre |
Hofsjökull Iceland Langjökull |
genre_facet |
Hofsjökull Iceland Langjökull |
op_relation |
https://elib.dlr.de/135251/1/qj.3848.pdf Wilms, Henrike und Bramberger, Martina und Dörnbrack, Andreas (2020) Observation and simulation of mountain wave turbulence above Iceland: Turbulence intensification due to wave interference. Quarterly Journal of the Royal Meteorological Society, 146 (732), Seiten 3326-3346. Wiley. doi:10.1002/qj.3848 <https://doi.org/10.1002/qj.3848>. ISSN 0035-9009. |
op_rights |
cc_by_nc_nd |
op_doi |
https://doi.org/10.1002/qj.3848 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
146 |
container_issue |
732 |
container_start_page |
3326 |
op_container_end_page |
3346 |
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1782334910877401088 |