  Direct numerical simulations are employed to reveal three distinctly
different flow regions in rotating spherical Rayleigh-B\'enard convection. In
the low-latitude region $\mathrm{I}$ vertical (parallel to the axis of
rotation) convective columns are generated between the hot inner and the cold
outer sphere. The mid-latitude region $\mathrm{II}$ is dominated by vertically
aligned convective columns formed between the Northern and Southern hemispheres
of the outer sphere. The diffusion-free scaling, which indicates bulk-dominated
convection, originates from this mid-latitude region. In the equator region
$\mathrm{III}$ the vortices are affected by the outer spherical boundary and
are much shorter than in region $\mathrm{II}$.
  Thermally driven turbulence with background rotation in spherical
Rayleigh-B\'enard convection is found to be characterized by three distinctly
different flow regions. The diffusion-free scaling, which indicates the heat
transfer is bulk-dominated, originates from the mid-latitude region in which
vertically aligned vortices are stretched between the Northern and Southern
hemispheres of the outer sphere.\ These results show that the flow physics in
rotating convection are qualitatively different in planar and spherical
geometries. This finding underlines that it is crucial to study convection in
spherical geometries to better understand geophysical and astrophysical flow
phenomena.
