Field experiments were carried out in the southwest part of the Suonada sound in the late summer, 2005 to reveal the process and the mechanism of the dissolved oxygen (DO) variation in this sea. This study shows that DO near the basin floor was changed widely by the influence of the residual current, the atmospheric temperature, the thermocline and so on though many of researchers reported that DO variations resulted from resuspension of floor mud. In other words, DO variation is not concerned with the vertical phenomena but with the horizontal advection. It is suggested from the further analysis that the residual current given by elimination of the four main tidal components was varied by the wind during this experiment and the behavior of the thermocline was concerned with the wind and the atmospheric temperature.
DO variation
fortnight field experiment
drift current
coastal waters