This paper is a compilation of the results obtained from various Doppler sodar comparison experiments conducted over the last 20 years. These studies have attempted to quantify the uncertainties in sodar-derived values of the horizontal wind speed, wind direction, standard deviation of the vertical wind speed w, and standard deviation of the horizontal wind direction . Doppler sodar configurations examined in these studies included bistatic, monostatic, and phased array. In most cases, reference measurements used for comparison were made by tower-based in situ sensors. Many investigators have used simple linear regressions and other statistical measures such as the correlation coefficient, bias (mean difference), comparability (root-mean-square difference), and precision (standard deviation) in an attempt to quantify those errors. The sodar-derived wind speed and wind direction are highly correlated against reference measurements (~ 0.92) with a precision of 1.06 m s1 and 21.5, respectively, for the entire dataset. Correlations of sodar-derived values of w were not quite as good (~ 0.81) with an average precision of 0.18 m s1. Past studies have shown that w accuracies vary significantly from day (convective conditions) to night (stable conditions). Very few data values were available for , which had a poor correlation of 0.57 and a precision of 10.7. The conclusions from many of these studies have shown that Doppler sodars can accurately obtain the mean wind speed and wind direction. Values of w have larger uncertainties, while estimates of have errors that are considered unacceptable for any practical use. Much of the observed scatter in sodar wind measurements can be attributed to a number of factors. These include, but are not limited to, instrument configuration, spatiotemporal variability, noise, and processing techniques.
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Apr 11, 1997
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