Heinemann, Günther; Preußer, Andreas; Zentek, Rolf; Brooks, Ian M (2023): HALO wind lidar (level 1) data of the University of Trier for MOSAiC [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.954826

Wind lidar measurements of the atmospheric boundary layer (ABL) were performed during the Multidisciplinary drifting Observatory for Study of Arctic Climate (MOSAiC) from September 2019 to October 2020. A “Halo-Photonics Streamline” (HPS) scanning wind lidar was used, which operates at a wavelength of 1.5 μm. The lidar can operate with a maximum range of 10km and is a programmable scanner, which enables vertical scans in all hemispheric directions. The scan patterns are the vertical azimuth display (VAD), the range-height indicator (RHI), and scans in one direction (STARE). The VAD is used for the determination of wind profiles above the lidar. The RHI scans are performed with different elevation angles. This allows for measurements of cross-sections, but also for the estimation of turbulent kinetic energy (TKE) profiles. Vertical STARE data can be used to compute the vertical wind variance profile. The HALO lidar measurements were performed in cooperation with the University of Leeds (PI Ian Brooks, Brooks 2022a), where the same quality control procedure was applied to the raw data of both HALO wind lidars of the University of Leeds and the University of Trier leading to the level 1 data of this data publication. The lidar raw data are high resolution (~3m along-beam and a few seconds temporal) measurements of lidar backscatter ratio and along-beam Doppler velocity. Data is only available where sufficient particles are available to backscatter the laser beam. The Doppler velocities were corrected for lidar orientation (pitch/roll/heading) and the drift speed of the ice. The result are true earth-relative velocities. The Level 1 data are the data for single beams, and are the basis for the calculation of derived quantities such as the vertical wind profile and wind variances. For the calculation of wind profiles from the single beams of the data e.g. as in Zentek et al. (2018), the lidar_heading must be taken into account. The horizontal direction is the sum of the variables [azimuth_true]+[lidar_heading]. Wind profiles will be published in a separate data publication. Data are provided only for the drift periods. Major data gaps occurred for 14 Feb. 2020 - 17 March 2020 and for 25 March 2020 - 28 March 2020.

Variables and units are documented in the Netcdf data.