简介：Betaeffectsonsurfaceflowsinarotatingannuluswitharadialtemperaturegradientandaslopingbottomwerestudiedexperimentally.AnazimuthaljetwasproducedbytheactionoftheCoriolisforceintheconvectiveregionbetweenthetwosidewallsoftheannulus.Propagatingvelocityandpatternsofthebaroclinicwaveonthesurfacewereobtainedbyusingafrequency-meterandastreakphotographrespectively.Itisshownthatthereexiststhenonlinearinteractionbetweenthebaroclinicandbetaeffects.Thebetaeffectexertslittleinfluenceonthestratificationflowsandconstrainsthebaroclinicinstability,anditpromptstheinstabilityoftheweakstratificationflowsandresultsinthesurfacepatternofwaveswithhigherfrequency.Itisalsoindicatedthatthebetaeffectcanreducethepropagatingspeedofthesurfacewavesinthejet,andincreasethethermalRossbynumberforthosesamesurfacepatternsunderagivenTaylornumber.