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We present measurements of the azimuthal orientation {\theta}(t) and thermalamplitude {\delta}(t) of the large-scale circulation (LSC) of turbulentrotating convection within an unprecedented large Rossby number range 1<Ro<314.Results of {\theta}(t) reveal persistent rotation of the LSC flow in theretrograde direction over the entire Ro range. The rotation speed ratio remainsa constant of 0.13(${\pm}$0.01) for 10<Ro<70, but starts to increase withincreasing Ro when Ro>70. We identify the mechanism through which the meanretrograde rotation speed can be enhanced by stochastic cessations in thepresence of weak Coriolis force, and show that a low-dimensional, stochasticmodel provides predictions of the observed large-scale flow dynamics andinterprets its retrograde rotation.

Enhanced azimuthal rotation of the large-scale flow through stochastic cessations in turbulent rotating convection with large Rossby numbers