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• 2m | 50m | 90m

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Description

This data set contains vertical profiles of the mean wind vector and of the maximum gust wind speed derived from ultrasonic anemometer measurements at heights of 2.4 m, 50.3 m and 90.3 m at the Grenzschichtmessfeld (GM) Falkenberg during the Field Experiment on Sub-mesoscale Spatio-Temporal Variability in Lindenberg (FESSTVaL) over the period May 17, 2021, to August 31, 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 sonic measurements are recorded at 20Hz and are quality checked (see below). After quality control, both the 10min mean wind and the maximum gust speed for each interval are calculated. Here, the maximum of the 3s moving average is chosen as the maximum gust speed. This goes with the definition of wind gusts according to the WMO standard (WMO, 2018: Measurement of surface wind, In: Guide to Meteorological Instruments and Methods of Observation, Volume I - Measurement of Meteorological Variables, No.8, 196–213).

All data are organized in daily files. Note that two additional wind and gust products are available for which a separate description is given, these are based on Doppler lidar profile measurements analysed with two different algorithms (level2dwd, level2uzk under fval-dlidcsm-wind-and-gust).

Limitations: Quality control of the sonic raw data follows Vickers and Mahrt (1997, https://journals.ametsoc.org/view/journals/atot/14/3/1520-0426_1997_014_0512_qcafsp_2_0_co_2.xml. It includes tests for non-physical values, constant values, and spikes. Constant values are eliminated, and spikes are detected and replaced by linearly interpolated values. Note that this spike-detection does not affect the identification of wind gusts, since it only removes significant outliers of at maximum three consecutive data values (corresponding to a duration of less than 0.2 s which is more than one magnitude shorter than the duration of a gust).

Each sonic value is accompanied by a quality flag (qc_wind) where 0 = bad, and 1 = good.

• Instruments: ultrasonic anemometer USA-1 (Metek GmbH)
• Locations: Falkenberg: 52.167 degrees North, 14.123 degrees East
• Vertical resolution: 2.4 m, 50.3 m and 90.3 m
• Time resolution: 10 minutes
• File format: NETCDF4
• Time period:
  Start: 2021-05-17
  End: 2021-08-31
• Standard: SAMD v2.2, https://doi.org/10.25592/uhhfdm.9902
• Project: FESSTVAL

carola.detring (at) dwd.de
frank.beyrich (at) dwd.de