Preprints
https://doi.org/10.5194/amt-2021-426
https://doi.org/10.5194/amt-2021-426
 
26 Jan 2022
26 Jan 2022
Status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

A new scanning scheme and flexible retrieval for mean winds and gusts from Doppler lidar measurements

Julian Steinheuer1,2, Carola Detring3, Frank Beyrich3, Ulrich Löhnert1,2, Petra Friederichs2,4, and Stephanie Fiedler1,2 Julian Steinheuer et al.
  • 1Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany
  • 2Hans-Ertel Centre for Weather Research, Climate Monitoring and Diagnostics, Cologne/Bonn, Germany
  • 3Deutscher Wetterdienst, Meteorological Observatory Lindenberg – Richard-Aßmann-Observatory, Lindenberg, Germany
  • 4Institute of Geosciences, University of Bonn, Bonn, Germany

Abstract. Doppler wind lidars (DWLs) have increasingly been used over the last decade to derive the mean wind in the atmospheric boundary layer. DWLs allow the determination of wind vector profiles with high vertical resolution and provide an alternative to classic meteorological tower observations. They also receive signals from higher altitudes than a tower and can be set up flexibly in any power-supplied location. In this work, we address the question of whether and how wind gusts can be derived from DWL observations. The characterization of wind gusts is one central goal of the Field Experiment on Sub-Mesoscale Spatio-Temporal Variability in Lindenberg (FESSTVaL). Obtaining wind gusts from a DWL is not trivial because a monostatic DWL provides only a radial velocity per line-of-sight, i.e., only one component of a three-dimensional vector, and measurements in at least three linearly independent directions are required to derive the wind vector. Performing them sequentially limits the achievable time resolution, while wind gusts are short-lived phenomena. This study compares different DWL configurations in terms of their potential to derive wind gusts. For this purpose, we develop a new wind retrieval method that is applicable to different scanning configurations and various time resolutions. We test eight configurations with StreamLine DWL systems from Halo Photonics and evaluate gust peaks and mean wind over 10 minutes at 90 m a.g.l. against a sonic anemometer at the meteorological tower in Falkenberg, Germany. The best performing configuration for retrieving wind gusts proves to be a fast continuous scanning mode (CSM) that completes a full observation cycle within 3.4 s. During this time interval, about eleven radial Doppler velocities are measured, which are then used to retrieve single gusts. The fast CSM configuration was successfully operated over a three-month period in summer 2020. The CSM paired with our new retrieval technique provides gust peaks that compare well to classic sonic anemometer measurements from the meteorological tower.

Julian Steinheuer et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-426', Anonymous Referee #1, 17 Feb 2022
    • AC1: 'Reply on RC1', Julian Steinheuer, 06 May 2022
  • RC2: 'Comment on amt-2021-426', Anonymous Referee #2, 07 Apr 2022
    • AC2: 'Reply on RC2', Julian Steinheuer, 06 May 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-426', Anonymous Referee #1, 17 Feb 2022
    • AC1: 'Reply on RC1', Julian Steinheuer, 06 May 2022
  • RC2: 'Comment on amt-2021-426', Anonymous Referee #2, 07 Apr 2022
    • AC2: 'Reply on RC2', Julian Steinheuer, 06 May 2022

Julian Steinheuer et al.

Data sets

Doppler wind lidar wind and gust data from FESTVAL 2019/2020 Julian Steinheuer and Carola Detring and Markus Kayser and Ronny Leinweber https://doi.org/10.25592/uhhfdm.9758

Model code and software

JSteinheuer/DWL\_retrieval: DWL retrieval Julian Steinheuer and Carola Detring and Frank Beyrich and Ulrich Löhnert and Petra Friederichs and Stephanie Fiedler https://doi.org/10.5281/ZENODO.5780949

Julian Steinheuer et al.

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Short summary
Doppler wind lidars (DWLs) allow the determination of wind profiles with high vertical resolution and thus provide an alternative to meteorological towers. We address the question of whether wind gusts can be derived since they are short-lived phenomena. Therefore, we compare different DWL configurations and develop a new method applicable to all of them. A fast continuous scanning mode that completes a full observation cycle within 3.4 s is found to be the best performing configuration.