[en] Turbulent round buoyant jets discharging into linearly density-stratified stagnant fluids are studied. An integral model with a new density profile is developed in order to represent more correctly the cross-sectional density distribution. In an experimental study, the dilution of a passive tracer along the jet trajectory, the maximum height of rise, and terminal dilution are measured. Measured center-line dilutions and jet widths are in agreement with model predictions. It is found that jet mixing is not significantly influenced by either the ambient density gradient or the gravitational spreading layer. The model yielded reasonable predictions of the terminal height of rise and dilution for buoyancy dominated discharges, but underestimated those parameters for horizontal and vertical momentum-dominated discharges