Effects of surface waves and ship heave-and-roll on CTD data and processing method for CTD data
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The effects of surface waves and ship heave-and-roll on CTD data are discussed. The heave-and-roll produces spurious step-like structures in the CTD data. Derivation of a formula for calculating the probe's fall speed is discussed. Several current techniques for CTD sensor lag correction are analyzed and compared. It is shown the lag correction procedure presented here, which is based on the Giles-McDougall technique, can be employed to treat CTD data from regions with slow or fast T-S variations, for instance, in strong seasonal thermocline. False salinity spikes or humps in data corrected with this procedure are significantly reduced.
KeywordsSurface Wave Pressure Reading Ship Motion Conductivity Sensor Density Inversion
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