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Effect of Pulse Averaging on Sonic Anemometer Spectra

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  • 1 James Rennell Division, Southampton Oceanography Centre, Southampton, United Kingdom
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Abstract

Recent analysis of high quality Solent sonic anemometer spectra revealed a frequency-dependent systematic underestimation of the spectral levels with a minimum at about three-quarters of the Nyquist frequency. It is shown that this is due to the eightfold pulse average with which the Solent sonic achieves its nominal sampling frequency of 21 Hz, combined with the effects of aliasing. An explicit correction curve is developed.

Corresponding author address: Dr. Peter K. Taylor, James Rennell Centre for Ocean Circulation, Southampton Oceanography Centre, Room 254/27, European Way, Southampton SO14 3ZH, United Kingdom.

Email: P.K.Taylor@soc.soton.ac.uk

Abstract

Recent analysis of high quality Solent sonic anemometer spectra revealed a frequency-dependent systematic underestimation of the spectral levels with a minimum at about three-quarters of the Nyquist frequency. It is shown that this is due to the eightfold pulse average with which the Solent sonic achieves its nominal sampling frequency of 21 Hz, combined with the effects of aliasing. An explicit correction curve is developed.

Corresponding author address: Dr. Peter K. Taylor, James Rennell Centre for Ocean Circulation, Southampton Oceanography Centre, Room 254/27, European Way, Southampton SO14 3ZH, United Kingdom.

Email: P.K.Taylor@soc.soton.ac.uk

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