Correcting false thermistor string data

In order to monitor the temperature variability over the total water column in a stratified shallow sea, a thermistor string was suspended from a moored loosely tethered surface buoy. Some of the temperature data manifested strong first tidal harmonic variability and unrealistic thermocline deepening. It is shown that the string lifted under the action of horizontal buoy displacement. Although the data may be corrected by using additional pressure or tilt sensors, a method is given to detect and correct them using current data, some simple arguments for buoy displacement under drag force and cross-spectral information from the first harmonic tidal band. The method proves adequate, as has been verified using temperature data measured at a nearby sub-surface mooring and some CTD information.