Xia, HuaFrancois, NicolasPunzmann, HorstShats, Michael2015-12-080031-9007http://hdl.handle.net/1885/35004We report new measurements of single particle dispersion in turbulent two-dimensional (2D) flows. Laboratory experiments in electromagnetically driven and Faraday wave driven turbulence reveal a transition from weakly dispersing superdiffusive regime to strongly dispersing Brownian diffusion as the flow energy is increased in a broad range. The transition to fully developed 2D turbulence is characterized by the topological changes in the fluid particle trajectories and the development of self-similar diffusion. The degree of 2D turbulence development can be quantified by a parameter describing the deviation of single particle dispersion from the Taylor dispersion.Author/s retain copyright201410.1103/PhysRevLett.112.1045012015-12-08