Wildmann, Norman und Päschke, Eileen und Roiger, Anke und Mallaun, Christian (2020) Towards improved turbulence estimation with Doppler wind lidar velocity-azimuth display (VAD) scans. Atmospheric Measurement Techniques, 13 (8), Seiten 4141-4158. Copernicus Publications. doi: 10.5194/amt-13-4141-2020. ISSN 1867-1381.
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Offizielle URL: http://dx.doi.org/10.5194/amt-13-4141-2020
Kurzfassung
The retrieval of turbulence parameters with profiling Doppler wind lidars (DWLs) is of high interest for boundary layer meteorology and its applications. DWLs provide wind measurements above the level of meteorological masts while being easier and less expensive to deploy. Velocity-azimuth display (VAD) scans can be used to retrieve the turbulence kinetic energy (TKE) dissipation rate through a fit of measured azimuth structure functions to a theoretical model. At the elevation angle of 35.3° it is also possible to derive TKE. Modifications to existing retrieval methods are introduced in this study to reduce errors due to advection and enable retrievals with a low number of scans. Data from two experiments are utilized for validation: first, measurements at the Meteorological Observatory Lindenberg–Richard-Aßmann Observatory (MOL-RAO) are used for the validation of the DWL retrieval with sonic anemometers on a meteorological mast. Second, distributed measurements of three DWLs during the CoMet campaign with two different elevation angles are analyzed. For the first time, the ground-based DWL VAD retrievals of TKE and its dissipation rate are compared to in situ measurements of a research aircraft (here: DLR Cessna Grand Caravan 208B), which allows for measurements of turbulence above the altitudes that are in range for sonic anemometers. From the validation against the sonic anemometers we confirm that lidar measurements can be significantly improved by the introduction of the volume-averaging effect into the retrieval. We introduce a correction for advection in the retrieval that only shows minor reductions in the TKE error for 35.3° VAD scans. A significant bias reduction can be achieved with this advection correction for the TKE dissipation rate retrieval from 75° VAD scans at the lowest measurement heights. Successive scans at 35.3 and 75° from the CoMet campaign are shown to provide TKE dissipation rates with a good correlation of R>0.8 if all corrections are applied. The validation against the research aircraft encourages more targeted validation experiments to better understand and quantify the underestimation of lidar measurements in low-turbulence regimes and altitudes above tower heights.
elib-URL des Eintrags: | https://elib.dlr.de/135709/ | ||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||
Titel: | Towards improved turbulence estimation with Doppler wind lidar velocity-azimuth display (VAD) scans | ||||||||||||||||||||
Autoren: |
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Datum: | 4 August 2020 | ||||||||||||||||||||
Erschienen in: | Atmospheric Measurement Techniques | ||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||
Gold Open Access: | Ja | ||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||
Band: | 13 | ||||||||||||||||||||
DOI: | 10.5194/amt-13-4141-2020 | ||||||||||||||||||||
Seitenbereich: | Seiten 4141-4158 | ||||||||||||||||||||
Verlag: | Copernicus Publications | ||||||||||||||||||||
ISSN: | 1867-1381 | ||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||
Stichwörter: | Lidar, wind profiling, turbulence | ||||||||||||||||||||
HGF - Forschungsbereich: | Energie | ||||||||||||||||||||
HGF - Programm: | Erneuerbare Energie | ||||||||||||||||||||
HGF - Programmthema: | Windenergie | ||||||||||||||||||||
DLR - Schwerpunkt: | Energie | ||||||||||||||||||||
DLR - Forschungsgebiet: | E SW - Solar- und Windenergie | ||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | E - Windenergie (alt) | ||||||||||||||||||||
Standort: | Oberpfaffenhofen | ||||||||||||||||||||
Institute & Einrichtungen: | Institut für Physik der Atmosphäre > Verkehrsmeteorologie Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe Flugexperimente > Oberpfaffenhofen | ||||||||||||||||||||
Hinterlegt von: | Wildmann, Norman | ||||||||||||||||||||
Hinterlegt am: | 05 Aug 2020 10:14 | ||||||||||||||||||||
Letzte Änderung: | 27 Okt 2023 14:59 |
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