We describe impacts of air-temperature and wind-pattern changes from 1981 to 2004 on hydrodynamic flow and water quality in Ise Bay. Trend analyses for the air temperature and the strong wind were carried out. The results indicated that the annual average of the air temperature was a significant warming trend, and that the frequency of strong-wind events from February to March decreased remarkably. The influences of these meteorological changes on the hydrodynamic flow in Ise Bay were evaluated using numerical simulations. It was clarified that the changes in the air temperature and the wind pattern have an impact upon the circulation flow in the middle and the bottom layers, and that the region of the increase in the flow velocity in February agreed with that of the decrease in COD in the bottom layer and vice versa.
