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View meta data:

• Falkenberg Level1 v00
• Falkenberg Level1 v01
• Falkenberg Level2 v00 10min
• Falkenberg Level2 v01 10min
• Falkenberg Level2 v00 30min
• Falkenberg Level2 v01 30min
• Lindenberg Level1
• Lindenberg Level2 10min
• Lindenberg Level2 30min

Download data:

• Get single Falkenberg data files via HTTP/OPeNDAP | Get all Falkenberg data files via wget script
• Get singel Lindenberg data files via HTTP/OPeNDAP | Get all Lindenberg data files via wget script

Description

This data set contains vertical profiles of the mean wind vector derived from Doppler lidar measurements:

• at the Lindenberg Meteorological Observatory – Richard-Aßmann-Observatory (MOL-RAO) supersite during the Field Experiment on Sub-mesoscale Spatio-Temporal Variability in Lindenberg (FESSTVaL) between May 17 and July 15, 2021. The MOL-RAO supersite is operated by the German national meteorological service (Deutscher Wetterdienst, DWD).
• at the Grenzschichtmessfeld (GM) Falkenberg during the Field Experiment on Sub-mesoscale Spatio-Temporal Variability in Lindenberg (FESSTVaL) during June and July, 2021. The GM Falkenberg as part of the Lindenberg Meteorological Observatory – Richard-Aßmann-Observatory supersite is operated by the German national meteorological service (Deutscher Wetterdienst, DWD). The Doppler lidar system was kindly provided by Technische Universität Berlin, Institute for Ecology, Chair of Climatology.

Two subsets of data are provided:

• Level-1 data represent the instantaneous backscatter intensity and radial velocity profile measurements along each single ray.
• Level-2 data represent 10- and 30-minutes averages of the mean wind vector, respectively. At Lindenberg, they are processed by DWD using the consensus approach (see, e.g., Päschke et al. 2015 - doi:10.5194/amt-8-2251-2015) identifying the most reliable cluster of radial velocity retrievals along each scan direction from a series of scans during the averaging interval.

All data are organized in daily files. They are based on a step-stare Velocity Azimuth Display (VAD) lidar scan pattern with 24 rays per scan circle and 30000 lidar pulses per ray at a 15 deg zenith angle. The profiles typically cover a height range between about 90 m a.g.l. and the top of the boundary layer, depending on atmospheric conditions.

Besides the meteorological variables, an error estimate and a quality flag are given for each variable. Furthermore, quality test information and instrumental parameters are given.

Data from June 12 to June 23 at Falkenberg had to be reprocessed to correct for an azimuth error, these data are labelled as version 01.

Limitations:
For Lindenberg: Quality tests of the DWD standard processing include an assessment of the coefficient of determination of the VAD fit and of the condition number indicating the sectoral coverage of the fit.

For Falkenberg: Raw data processing follows the sensitive consensus approach identifying the most reliable cluster of radial velocity retrievals along each scan direction from a series of scans during the averaging interval. Quality tests include an assessment of the coefficient of determination of the VAD fit and of the condition number indicating the sectoral coverage of the fit.

For both: The retrieval algorithm has been validated through a long-term inter-comparison of lidar-based winds versus radiosonde and radar wind profiler wind retrievals resulting in a typical uncertainty (rmsd) of 0.8 m/s and 8.0 deg for wind speed and wind direction, respectively.

Each measured value is accompanied by a quality flag where 0 = bad, and 1 = good.

• Instruments: Source: ground based remote sensing, Doppler lidar Streamline / Streamline XR (Halo Photonics Ltd.) :
  Lindenberg : S/N #44 (XR)
  Falkenberg : S/N #143 (XR)
• Locations:
  Falkenberg: 52.167 degrees North, 14.123 degrees East, 73 meters above mean sea level
  Lindenberg: 52.209 degrees North, 14.122 degrees East, 104 meters above mean sea level
  
• Vertical resolution: 36m
  
• Time resolution:
  Level 1 data: approx. 5 s
  Level 2 data: 10 / 30 minutes
• File format: NETCDF4
• Time period (see single XML Files for information about the single data sets):
  Falkenberg: Start: 2021-06-12, End: 2021-07-19
  Lindenberg: Start: 2021-05-17, End: 2021-07-15
  
• Standard: SAMD v2.2, https://doi.org/10.25592/uhhfdm.9902
• Project: FESSTVAL

Ronny Leinweber, ronny.leinweber (at) dwd.de