  Recent findings of helioseismology as well as advances in direct numerical
simulations of global dynamics of the Sun have indicated that in each solar
hemisphere the meridional circulation forms the two cells along the in the
convection zone. We investigate properties of a mean-field solar dynamo with
such double-cell meridional circulation. The dynamo model also includes the
realistic profile of solar differential rotation (including the tachocline and
subsurface shear layer), and takes into account effects of turbulent pumping,
anisotropic turbulent diffusivity, and conservation of magnetic helicity.
Contrary to previous flux-transport dynamo models, it is found that the dynamo
model can robustly reproduce the basic properties of the solar magnetic cycles
for a wide range of model parameters and the circulation speed. The best
agreement with observations is achieved when the surface speed of meridional
circulation is about 12 m/s. For this circulation speed the simulated sunspot
activity shows good synchronization with the polar magnetic fields. Such
synchronization was indeed observed during the past sunspot cycles 21 and 22.
We compare theoretical and observed phase diagrams of the sunspot number and
the polar field strength and discuss the peculiar properties of Cycle 23.
