Abstract
The stratification of upper layer of coastal water can be regarded as an unused energy source in summer. The coastal water has large capability to store the urban heat owing to the heat capacity difference between the air and water. The estimated urban heat over Sumiyoshi ward in Osaka is equivalent to 10 m3/s warm water if we allow 7 degree water temperature increase from stagnant environment. The numerical simulation of the urban heat release into coastal zone is performed. The larger warm water discharge gives absorption effect of short wave radiation from the atomsphere to the ocean due to enhancement of vertical mixing of upper occean.
