Airborne coherent wind lidar measurements of the momentum flux profile from orographically induced gravity waves
<p>In the course of the GW-LCYCLE II campaign, conducted in Jan/Feb 2016 from Kiruna, Sweden, coherent Doppler wind lidar (2 <span class="inline-formula">µ</span>m DWL) measurements were performed from the DLR Falcon aircraft to investigate gravity waves induced by flow a...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-03-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/16/1087/2023/amt-16-1087-2023.pdf |
| _version_ | 1827999781376491520 |
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| author | B. Witschas S. Gisinger S. Rahm A. Dörnbrack D. C. Fritts M. Rapp |
| author_facet | B. Witschas S. Gisinger S. Rahm A. Dörnbrack D. C. Fritts M. Rapp |
| author_sort | B. Witschas |
| collection | DOAJ |
| description | <p>In the course of the GW-LCYCLE II campaign, conducted in Jan/Feb 2016 from Kiruna, Sweden, coherent Doppler wind lidar (2 <span class="inline-formula">µ</span>m DWL) measurements were performed from the DLR Falcon aircraft to investigate gravity waves induced by flow across the Scandinavian Alps. During a mountain wave event on 28 January 2016, a novel momentum flux (MF) scan pattern with fore and aft propagating laser beams was applied to the 2 <span class="inline-formula">µ</span>m DWL. This allows us to measure the vertical wind and the horizontal wind along the flight track simultaneously with a high horizontal resolution of <span class="inline-formula">≈800 m</span> and hence enables us to derive the horizontal MF profile for a broad wavelength spectrum from a few hundred meters to several hundred kilometers. The functionality of this method and the corresponding retrieval algorithm is validated using a comparison against in situ wind data measured by the <i>High Altitude and Long Range</i> (<i>HALO</i>) aircraft which was also deployed in Kiruna for the POLSTRACC (Polar Stratosphere in a Changing Climate) campaign. Based on that, the systematic and random error of the wind speeds retrieved from the 2 <span class="inline-formula">µ</span>m DWL observations are determined. Further, the measurements performed on that day are used to reveal significant changes in the horizontal wavelengths of the vertical wind speed and of the leg-averaged momentum fluxes in the tropopause inversion layer (TIL) region, which are likely to be induced by interfacial waves as recently presented by <span class="cit" id="xref_text.1"><a href="#bib1.bibx20">Gisinger et al.</a> (<a href="#bib1.bibx20">2020</a>)</span>.</p> |
| first_indexed | 2024-04-10T06:03:54Z |
| format | Article |
| id | doaj.art-689e80e4e6d146718fbebfd3ca598c92 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-04-10T06:03:54Z |
| publishDate | 2023-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-689e80e4e6d146718fbebfd3ca598c922023-03-03T05:12:04ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482023-03-01161087110110.5194/amt-16-1087-2023Airborne coherent wind lidar measurements of the momentum flux profile from orographically induced gravity wavesB. Witschas0S. Gisinger1S. Rahm2A. Dörnbrack3D. C. Fritts4M. Rapp5Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Physik der Atmosphäre, 82234 Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Physik der Atmosphäre, 82234 Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Physik der Atmosphäre, 82234 Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Physik der Atmosphäre, 82234 Oberpfaffenhofen, GermanyGATS, Boulder, CO, USADeutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut für Physik der Atmosphäre, 82234 Oberpfaffenhofen, Germany<p>In the course of the GW-LCYCLE II campaign, conducted in Jan/Feb 2016 from Kiruna, Sweden, coherent Doppler wind lidar (2 <span class="inline-formula">µ</span>m DWL) measurements were performed from the DLR Falcon aircraft to investigate gravity waves induced by flow across the Scandinavian Alps. During a mountain wave event on 28 January 2016, a novel momentum flux (MF) scan pattern with fore and aft propagating laser beams was applied to the 2 <span class="inline-formula">µ</span>m DWL. This allows us to measure the vertical wind and the horizontal wind along the flight track simultaneously with a high horizontal resolution of <span class="inline-formula">≈800 m</span> and hence enables us to derive the horizontal MF profile for a broad wavelength spectrum from a few hundred meters to several hundred kilometers. The functionality of this method and the corresponding retrieval algorithm is validated using a comparison against in situ wind data measured by the <i>High Altitude and Long Range</i> (<i>HALO</i>) aircraft which was also deployed in Kiruna for the POLSTRACC (Polar Stratosphere in a Changing Climate) campaign. Based on that, the systematic and random error of the wind speeds retrieved from the 2 <span class="inline-formula">µ</span>m DWL observations are determined. Further, the measurements performed on that day are used to reveal significant changes in the horizontal wavelengths of the vertical wind speed and of the leg-averaged momentum fluxes in the tropopause inversion layer (TIL) region, which are likely to be induced by interfacial waves as recently presented by <span class="cit" id="xref_text.1"><a href="#bib1.bibx20">Gisinger et al.</a> (<a href="#bib1.bibx20">2020</a>)</span>.</p>https://amt.copernicus.org/articles/16/1087/2023/amt-16-1087-2023.pdf |
| spellingShingle | B. Witschas S. Gisinger S. Rahm A. Dörnbrack D. C. Fritts M. Rapp Airborne coherent wind lidar measurements of the momentum flux profile from orographically induced gravity waves Atmospheric Measurement Techniques |
| title | Airborne coherent wind lidar measurements of the momentum flux profile from orographically induced gravity waves |
| title_full | Airborne coherent wind lidar measurements of the momentum flux profile from orographically induced gravity waves |
| title_fullStr | Airborne coherent wind lidar measurements of the momentum flux profile from orographically induced gravity waves |
| title_full_unstemmed | Airborne coherent wind lidar measurements of the momentum flux profile from orographically induced gravity waves |
| title_short | Airborne coherent wind lidar measurements of the momentum flux profile from orographically induced gravity waves |
| title_sort | airborne coherent wind lidar measurements of the momentum flux profile from orographically induced gravity waves |
| url | https://amt.copernicus.org/articles/16/1087/2023/amt-16-1087-2023.pdf |
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