Abstract
Every day at nine o'clock, the sea surface temperature is observed at the head of the breakwater of the Port of Ito by the Fisheries Experimental Station of Shizuoka Prefecture. Besides, the water temperature at and below the surface are recorded continuously at the Ito Marine Observation Tower, which was erected by the Meteorological Research Institute 400 m off the shore and 20 m under water. The former observation station is situated in the same environments are other coastal stations in general, but the latter station is located in more oceanic enviromental conditions. Accordingly, it is reasonable to suppose that the two stations respond to variations of sea conditions differently from each other. We attempted, therefore, a comparison of variations of sea surface temperature as between the two stations, and found that, though the temperature of the Tower frequently lags by one or two days behind that of the port station, there is a good correlation between them as far as we are dealing with variations of sea conditions whose time scale is longer than several days.
Furthermore, from the water t e mperature data of the Tower, it was found that the sea surface temperature which is obtained at nine or ten o'clock is nearly equal to the diurnal mean temperature of the same day, and besides, that a marked water temperature difference occurs between the sea surface and 2 m depth on account of difference in the factors generating the water temperature variation of the respective layer.
