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During late August and early September 1979 the Boulder Atmospheric Observatory (BAO) was the site of an international comparison of low-level sounding techniques. Called the Boulder Low-Level Intercomparison Experiment (BLIE), its objective was to compare a wide range of sounding systems including free-rising sondes, tethered sondes, tower-mounted sensors, remotely piloted aircraft, and acoustic and electromagnetic remote sensors. Six acoustic Doppler systems were compared. This paper will describe procedures used for the intercomparison and offer some preliminary results showing how the systems compared with one another and with in situ wind measurement on the 300-m BAO tower.

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