Turbulence associated with mountain waves over Northern Scandinavia – a case study using the ESRAD VHF radar and the WRF mesoscale model
We use measurements by the 52 MHz wind-profiling radar ESRAD, situated near Kiruna in Arctic Sweden, and simulations using the Advanced Research and Weather Forecasting model, WRF, to study vertical winds and turbulence in the troposphere in mountain-wave conditions on 23, 24 and 25 January 2003. We...
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Copernicus Publications
2010
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00047281 2023-05-15T15:09:57+02:00 Turbulence associated with mountain waves over Northern Scandinavia – a case study using the ESRAD VHF radar and the WRF mesoscale model Kirkwood, S. Mihalikova, M. Rao, T. N. Satheesan, K. 2010-04 electronic https://doi.org/10.5194/acp-10-3583-2010 https://noa.gwlb.de/receive/cop_mods_00047281 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046901/acp-10-3583-2010.pdf https://acp.copernicus.org/articles/10/3583/2010/acp-10-3583-2010.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-10-3583-2010 https://noa.gwlb.de/receive/cop_mods_00047281 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046901/acp-10-3583-2010.pdf https://acp.copernicus.org/articles/10/3583/2010/acp-10-3583-2010.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2010 ftnonlinearchiv https://doi.org/10.5194/acp-10-3583-2010 2022-02-08T22:38:33Z We use measurements by the 52 MHz wind-profiling radar ESRAD, situated near Kiruna in Arctic Sweden, and simulations using the Advanced Research and Weather Forecasting model, WRF, to study vertical winds and turbulence in the troposphere in mountain-wave conditions on 23, 24 and 25 January 2003. We find that WRF can accurately match the vertical wind signatures at the radar site when the spatial resolution for the simulations is 1 km. The horizontal and vertical wavelengths of the dominating mountain-waves are ~10–20 km and the amplitudes in vertical wind 1–2 m/s. Turbulence below 5500 m height, is seen by ESRAD about 40% of the time. This is a much higher rate than WRF predictions for conditions of Richardson number (Ri) <1 but similar to WRF predictions of Ri<2. WRF predicts that air crossing the 100 km wide model domain centred on ESRAD has a ~10% chance of encountering convective instabilities (Ri<0) somewhere along the path. The cause of low Ri is a combination of wind-shear at synoptic upper-level fronts and perturbations in static stability due to the mountain-waves. Comparison with radiosondes suggests that WRF underestimates wind-shear and the occurrence of thin layers with very low static stability, so that vertical mixing by turbulence associated with mountain waves may be significantly more than suggested by the model. Article in Journal/Newspaper Arctic Kiruna Niedersächsisches Online-Archiv NOA Arctic Kiruna Atmospheric Chemistry and Physics 10 8 3583 3599 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Kirkwood, S. Mihalikova, M. Rao, T. N. Satheesan, K. Turbulence associated with mountain waves over Northern Scandinavia – a case study using the ESRAD VHF radar and the WRF mesoscale model |
topic_facet |
article Verlagsveröffentlichung |
description |
We use measurements by the 52 MHz wind-profiling radar ESRAD, situated near Kiruna in Arctic Sweden, and simulations using the Advanced Research and Weather Forecasting model, WRF, to study vertical winds and turbulence in the troposphere in mountain-wave conditions on 23, 24 and 25 January 2003. We find that WRF can accurately match the vertical wind signatures at the radar site when the spatial resolution for the simulations is 1 km. The horizontal and vertical wavelengths of the dominating mountain-waves are ~10–20 km and the amplitudes in vertical wind 1–2 m/s. Turbulence below 5500 m height, is seen by ESRAD about 40% of the time. This is a much higher rate than WRF predictions for conditions of Richardson number (Ri) <1 but similar to WRF predictions of Ri<2. WRF predicts that air crossing the 100 km wide model domain centred on ESRAD has a ~10% chance of encountering convective instabilities (Ri<0) somewhere along the path. The cause of low Ri is a combination of wind-shear at synoptic upper-level fronts and perturbations in static stability due to the mountain-waves. Comparison with radiosondes suggests that WRF underestimates wind-shear and the occurrence of thin layers with very low static stability, so that vertical mixing by turbulence associated with mountain waves may be significantly more than suggested by the model. |
format |
Article in Journal/Newspaper |
author |
Kirkwood, S. Mihalikova, M. Rao, T. N. Satheesan, K. |
author_facet |
Kirkwood, S. Mihalikova, M. Rao, T. N. Satheesan, K. |
author_sort |
Kirkwood, S. |
title |
Turbulence associated with mountain waves over Northern Scandinavia – a case study using the ESRAD VHF radar and the WRF mesoscale model |
title_short |
Turbulence associated with mountain waves over Northern Scandinavia – a case study using the ESRAD VHF radar and the WRF mesoscale model |
title_full |
Turbulence associated with mountain waves over Northern Scandinavia – a case study using the ESRAD VHF radar and the WRF mesoscale model |
title_fullStr |
Turbulence associated with mountain waves over Northern Scandinavia – a case study using the ESRAD VHF radar and the WRF mesoscale model |
title_full_unstemmed |
Turbulence associated with mountain waves over Northern Scandinavia – a case study using the ESRAD VHF radar and the WRF mesoscale model |
title_sort |
turbulence associated with mountain waves over northern scandinavia – a case study using the esrad vhf radar and the wrf mesoscale model |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/acp-10-3583-2010 https://noa.gwlb.de/receive/cop_mods_00047281 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046901/acp-10-3583-2010.pdf https://acp.copernicus.org/articles/10/3583/2010/acp-10-3583-2010.pdf |
geographic |
Arctic Kiruna |
geographic_facet |
Arctic Kiruna |
genre |
Arctic Kiruna |
genre_facet |
Arctic Kiruna |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-10-3583-2010 https://noa.gwlb.de/receive/cop_mods_00047281 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046901/acp-10-3583-2010.pdf https://acp.copernicus.org/articles/10/3583/2010/acp-10-3583-2010.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-10-3583-2010 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
10 |
container_issue |
8 |
container_start_page |
3583 |
op_container_end_page |
3599 |
_version_ |
1766341044124778496 |