Overview

The data provide vertical mean profiles of wind and temperature.

Data Details

• Data averaged over an interval of 30 minutes.
• Time stamp is included in each data file.
• Location: John Day/Rufus Water Treatment Plant (45.690842,-120.745751).
• Site Elevation: 62 m.

Data Quality

The only data quality procedure applied to this dataset is through the Sodar Operation Software (APRun).

APRun calculates wind speed, temperature, and all other output data from the raw data received from the device server during measurement. Raw data contain raw received signal data (Fourier power spectra) obtained during measurement. The raw data are filtered, preprocessed, and averaged over one full averaging interval (30 minutes). Various corrections and filters are applied, such as ground clutter detection and removal. All signals of the different subcycles, measurement beams, and acoustic frequencies are decoded and combined according to a composition matrix (Composit Construction Table). A pattern recognition and fit procedure obtains primary results for wind components and signal quality scores.

The primary results are checked against local signal quality criteria, combined signal quality criteria, and two-dimensional spatial/temporal consistency tests. Any data that do not pass all quality control tests are de-validated and removed, i.e., the output files contain error values (e.g., 99.999). For more details, refer to the Sodar APRun Software Manual.

Constraints

• The instrument is aligned to magnetic North.
• Correction for the magnetic declination (15 degrees E) was not accounted for the data until March 12, 2016 and was corrected thereafter. This information is included in header of each data file under the field <>. This angle is erroneously left equal to zero in the data files until March 12. Data after March 12 have the correct antenna azimuth angle of 15 degrees. An example of both types of data files is provided.

Note that the file header also includes the field <>, which is left to default value (i.e., zero [m]) for most of the dataset. This height value does not affect the actual data because it is only used by the APRun sodar software for visualization purposes.