DYNAMICS REGULATING CHARACTERISTIC DISTRIBUTION OF WATER TEMPERATURES IN NORTHERN AREA OF ISE BAY, JAPAN, IN WINTER

摘要

The environmental water temperatures in Ise Bay are characterized by a few degrees higher in the nearshore area than in the area off the shore. From the results of the field observation and the numerical experiment, it is estimated that the phenomenon peculiar to Ise Bay can be explained as follows. In the innermost area of Ise Bay, the vertical structure of water temperature is of an inverse stratification, which is caused by the salinity stabilizing the density stratification against much fresh water supplied even in winter. In consequence, the estuary circulation is maintained even in winter. The warm and salty water upwells from the lower layer in the innermost area of the bay and a higher temperature zone is formed. These phenomena are reinforced by the northern or north-westerly wind, prominent in winter, and the higher temperature zone spreads in the innermost area of the bay.