To clarify the effects of water blooms on the heat balance in a water body, some heat balance components were observed in a small water pond (length and breadth of 160cm; depth of 45cm) made of polystyrene board of 15cm thick.
Floatage of stratified water blooms increased the albedo on the water surface but decreased the net radiation in daytime. The water temperature near the surface was increased in daytime, and decreased in nighttime as a result of the floatage of water blooms. The amount of heat storage in the water body was reduced by the stratified water blooms, because of suppressing effect for transmission of solar radiation into the water body. The amount of latent heat flux was increased in daytime by the stratified water blooms but decreased in nighttime depending on the lower water surface temperature and the reduced heat storage in the water body.
