A study of local turbulence and anisotropy during the afternoon and evening transition with an unmanned aerial system and mesoscale simulation
Observations of turbulence are analysed for the afternoon and evening transition (AET) during the Boundary-Layer Late Afternoon and Sunset Turbulence (BLLAST) experimental field campaign that took place in Lannemezan (foothills of the Pyrenees) in summer 2011. The case of 2 July is further studi...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-07-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/16/8009/2016/acp-16-8009-2016.pdf |
| _version_ | 1831687591656685568 |
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| author | A. Lampert F. Pätzold M. A. Jiménez L. Lobitz S. Martin G. Lohmann G. Canut D. Legain J. Bange D. Martínez-Villagrasa J. Cuxart |
| author_facet | A. Lampert F. Pätzold M. A. Jiménez L. Lobitz S. Martin G. Lohmann G. Canut D. Legain J. Bange D. Martínez-Villagrasa J. Cuxart |
| author_sort | A. Lampert |
| collection | DOAJ |
| description | Observations of turbulence are analysed for the afternoon and evening
transition (AET) during the Boundary-Layer Late Afternoon and Sunset
Turbulence (BLLAST) experimental field campaign that took place in Lannemezan
(foothills of the Pyrenees) in summer 2011. The case of 2 July is further
studied because the turbulence properties of the lower atmosphere (up to
300 m above ground level) were sampled with the Meteorological Mini Aerial
Vehicle (M<sup>2</sup>AV) from turbulently mixed to stably stratified atmospheric
conditions. Additionally, data from radiosoundings, 60 m tower and UHF wind
profiler were taken together with the model results from a high-resolution
mesoscale simulation of this case. Weak large-scale winds and clear-sky
conditions were present on the studied AET case favouring the development of
slope winds and mountain–plain circulations. It is found that during the AET
the anisotropy of the turbulent eddies increases as the vertical motions are
damped due to the stably stratified conditions. This effect is enhanced by
the formation of a low-level jet after sunset. Finally, the comparison of the
anisotropy ratio computed from the different sources of observations allow us
to determine the most relevant scales of the motion during the AET in such a
complex terrain region. |
| first_indexed | 2024-12-20T09:01:08Z |
| format | Article |
| id | doaj.art-01b7aab7b4e447eaabb41d40b97901ab |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-20T09:01:08Z |
| publishDate | 2016-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-01b7aab7b4e447eaabb41d40b97901ab2022-12-21T19:45:51ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242016-07-01168009802110.5194/acp-16-8009-2016A study of local turbulence and anisotropy during the afternoon and evening transition with an unmanned aerial system and mesoscale simulationA. Lampert0F. Pätzold1M. A. Jiménez2L. Lobitz3S. Martin4G. Lohmann5G. Canut6D. Legain7J. Bange8D. Martínez-Villagrasa9J. Cuxart10Institute of Flight Guidance, TU Braunschweig, Braunschweig, GermanyInstitute of Flight Guidance, TU Braunschweig, Braunschweig, GermanyUniversitat de les Illes Balears, Palma de Mallorca, SpainInstitute of Flight Guidance, TU Braunschweig, Braunschweig, GermanyClimatology and Environmental Meteorology, Institute of Geoecology, TU Braunschweig, Braunschweig, GermanyEnergy Meteorology Group, Institute of Physics, Oldenburg University, Oldenburg, GermanyCNRM-GAME, UMR3589, Météo-France and CNRS, Toulouse, FranceCNRM-GAME, UMR3589, Météo-France and CNRS, Toulouse, FranceEberhard Karls University Tübingen, Tübingen, GermanyUniversitat de les Illes Balears, Palma de Mallorca, SpainUniversitat de les Illes Balears, Palma de Mallorca, SpainObservations of turbulence are analysed for the afternoon and evening transition (AET) during the Boundary-Layer Late Afternoon and Sunset Turbulence (BLLAST) experimental field campaign that took place in Lannemezan (foothills of the Pyrenees) in summer 2011. The case of 2 July is further studied because the turbulence properties of the lower atmosphere (up to 300 m above ground level) were sampled with the Meteorological Mini Aerial Vehicle (M<sup>2</sup>AV) from turbulently mixed to stably stratified atmospheric conditions. Additionally, data from radiosoundings, 60 m tower and UHF wind profiler were taken together with the model results from a high-resolution mesoscale simulation of this case. Weak large-scale winds and clear-sky conditions were present on the studied AET case favouring the development of slope winds and mountain–plain circulations. It is found that during the AET the anisotropy of the turbulent eddies increases as the vertical motions are damped due to the stably stratified conditions. This effect is enhanced by the formation of a low-level jet after sunset. Finally, the comparison of the anisotropy ratio computed from the different sources of observations allow us to determine the most relevant scales of the motion during the AET in such a complex terrain region.https://www.atmos-chem-phys.net/16/8009/2016/acp-16-8009-2016.pdf |
| spellingShingle | A. Lampert F. Pätzold M. A. Jiménez L. Lobitz S. Martin G. Lohmann G. Canut D. Legain J. Bange D. Martínez-Villagrasa J. Cuxart A study of local turbulence and anisotropy during the afternoon and evening transition with an unmanned aerial system and mesoscale simulation Atmospheric Chemistry and Physics |
| title | A study of local turbulence and anisotropy during the afternoon and evening transition
with an unmanned aerial system and mesoscale simulation |
| title_full | A study of local turbulence and anisotropy during the afternoon and evening transition
with an unmanned aerial system and mesoscale simulation |
| title_fullStr | A study of local turbulence and anisotropy during the afternoon and evening transition
with an unmanned aerial system and mesoscale simulation |
| title_full_unstemmed | A study of local turbulence and anisotropy during the afternoon and evening transition
with an unmanned aerial system and mesoscale simulation |
| title_short | A study of local turbulence and anisotropy during the afternoon and evening transition
with an unmanned aerial system and mesoscale simulation |
| title_sort | study of local turbulence and anisotropy during the afternoon and evening transition with an unmanned aerial system and mesoscale simulation |
| url | https://www.atmos-chem-phys.net/16/8009/2016/acp-16-8009-2016.pdf |
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