The artificial circulation and the mixing of temperature stratified water induced by an air bubble plume were studied in laboratory experiments. The time evolution of the spatial distribution of water temperatures was measured. The data were analyzed and gave information on the development of flow patterns and entrainment rates. Of particular interest were the development of the upwelling region, location of the plunge line, temperature structure in the farfield, and water entrainment by the bubble plume and by the plunging flow.