An international turbulence comparison experiment (ITCE 1976)

Turbulence data for the International Turbulence Comparison Experiment (ITCE) held at Conargo, N.S.W. (35 degrees 18'S, 145 degrees 10'E), during Oct. 1976 are analyzed. The standard deviation (s' super(2) ) super(1) super(/) super(2) and covariance w's' measured by a number of instruments and instrument arrays have been compared to assess their field performance and calibration accuracy. Satisfactory agreement, i.e., typically 5% for (s' super(2) ) super(1) super(/) super(2) (except in humidity) and of the order of 20% for w's', was achieved, but only after consideration of instrumental response at high frequencies, flow distortion induced by instruments and supporting structures, spatial separation of instruments used for covariance measurements, and statistical errors associated with single-point measurements over a finite-averaging time and with lateral separation of two sensor arrays being compared.