Abstract
Abstract A useful extension of upward-looking buoy-mounted acoustic Doppler current profilers (ADCPs), in particular for studying surface-mixed-layer dynamics from underneath, would be to combine them with a thermistor cable for obtaining simultaneous current and temperature profiles. Measurements with an ADCP, operating at 150 kHz and sampling at 2.2 m vertical bin lengths, were carried out from a barge moored in Lake San Vincente, California, over a water depth of 45 m, to investigate the effects of a thermistor string running along the axis of the instrument between the acoustic beams and held by a small auxiliary float. The biasing effect of the thermistor string itself was only of order 1%. Doppler biasing of the horizontal currents by two different kinds of Coats (one a cylindrical hard foam float with low acoustical reflectivity, the other a hollow sphere) was investigated. The floats were suspended at 15 and 30 m. For floats at 30 m, evidence was not conclusive because of apparent interference by ...
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