Preprints
https://doi.org/10.5194/amt-2020-304
https://doi.org/10.5194/amt-2020-304

  08 Sep 2020

08 Sep 2020

Review status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

A two-year intercomparison of CW focusing wind lidar and tall mast wind measurements at Cabauw

Steven Knoop, Fred C. Bosveld, Marijn J. de Haij, and Arnoud Apituley Steven Knoop et al.
  • Royal Netherlands Meteorological Institute (KNMI), Utrechtseweg 297, 3731 GA De Bilt, the Netherlands

Abstract. A two-year measurement campaign of the ZephIR 300 vertical profiling continuous-wave (CW) focusing wind lidar has been carried out by the Royal Netherlands Meteorological Institute (KNMI) at the Cabauw site. We focus on the (height-dependent) data availability of the wind lidar under various meteorological conditions and the data quality through a comparison with in situ wind measurements at several levels in the 213-m tall meteorological mast. We find an overall availability of quality controlled wind lidar data of 97 % to 98 %, where the missing part is mainly due to precipitation events exceeding 1 mm/h or fog or low clouds below 100 m. The mean bias in the horizontal wind speed is within 0.1 m/s with a high correlation between the mast and wind lidar measurements, although under some specific conditions (very high wind speed, fog or low clouds) larger deviations are observed. The mean bias in the wind direction is within 2°, which is on the same order as the combined uncertainty in the alignment of the wind lidars and the mast wind vanes. The well-known 180° error in the wind direction output for this type of instrument occurs about 9 % of the time. A correction scheme based on data of an auxiliary wind vane at a height of 10 m is applied, leading to a reduction of the 180° error below 2 %. This scheme can be applied in real-time applications in case a nearby, freely exposed, mast with wind direction measurements at a single height is available.

Steven Knoop et al.

 
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Steven Knoop et al.

Data sets

A two-year intercomparison of CW focusing wind lidar and tall mast wind measurements at Cabauw Steven Knoop https://doi.org/10.5281/zenodo.3966868

Steven Knoop et al.

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Short summary
Doppler wind lidars are laser-based remote sensing instruments that measure the wind up to a few hundred meters or even a few kilometers. Their data can improve weather models and help forecasters. To investigate their accuracy and required meteorological conditions we have carried out a two-year measurement campaign of a wind lidar at our Cabauw test site and made a comparison with cup anemometers and wind vanes at several levels in a 213-m tall meteorological mast.