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In LADCP (Lowered Acoustic Doppler Current Profiler) observations an unique data processing of following procedures is examined, First, every relative velocity profile obtained with a fixed time inter...val a down cast is transformed into an absolute velocity profile by adding the horizontal ADCP drift velocity at each time. Next, they are averaged for every depth and consequently a full absolute velocity profile is obtained. Here, the horizontal ADCP drift velocity at each time is estimated from the mean difference between the relative velocity profile at the time and the absolute velocity profiles at the adjoining times. For a starting Point of the chain of process, absolute velocity profiles obtained by using DGPS data when ADCP is located near a sea surface are used. For accuracy evaluation, rms differences between the LADCP data and vessel-mounted ADCP data obtained in two observations are calculated. As a result, the rms differences classified by depth layer (36-500 m) and by observation are about 15 cm/sec in common.show more
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