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Babcock-Leighton type solar dynamo models with single-celled meridionalcirculation are successful in reproducing many solar cycle features. Recentobservations and theoretical models of meridional circulation do not indicate asingle-celled flow pattern. We examine the role of complex multi-cellularcirculation patterns in a Babcock-Leighton solar dynamo in advection- anddiffusion-dominated regimes. We show from simulations that presence of a weak,second, high-latitude reverse cell speeds up the cycle and slightly enhancesthe poleward branch in butterfly diagram, whereas the presence of a second cellin depth reverses the tilt of butterfly wing to an anti-solar type. A butterflydiagram constructed from middle of convection zone yields a solar-like pattern,but this may be difficult to realize in the Sun because of magnetic buoyancyeffects. Each of the above cases behaves similarly in higher and lower magneticdiffusivity regimes. However, our dynamo with a meridional circulationcontaining four cells in latitude behaves distinctly differently in the tworegimes, producing solar-like butterfly diagrams with fast cycles in the higherdiffusivity regime, and complex branches in butterfly diagrams in the lowerdiffusivity regime. We also find that dynamo solutions for a four-celledpattern, two in radius and two in latitude, prefer to quickly relax toquadrupolar parity if the bottom flow-speed is strong enough, of similar orderof magnitude as the surface flow-speed.

A Babcock-Leighton solar dynamo model with multi-cellular meridional circulation in advection- and diffusion-dominated regimes