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Various models of solar sub-surface stratification are tested in the globalEULAG-MHD solver to simulate diverse regimes of near-surface convectivetransport. Sub- and superadiabacity are altered at the surface of the model ($r > 0.95~R_{\odot}$) to either suppress or enhance convective flow speeds in aneffort to investigate the impact of the near-surface layer on global dynamics.A major consequence of increasing surface convection rates appears to be asignificant alteration of the distribution of angular momentum, especiallybelow the tachocline where the rotational frequency predominantly increases athigher latitudes. These hydrodynamic changes correspond to large shifts in thedevelopment of the current helicity in this stable layer ($r<0.72R_{\odot}$),significantly altering its impact on the generation of poloidal and toroidalfields at the tachocline and below, acting as a major contributor towardstransitions in the dynamo cycle. The enhanced near-surface flow speed manifestsin a global shift of the toroidal field ($B_{\phi}$) in the butterfly diagram-- from a North-South symmetric pattern to a staggered anti-symmetricemergence.

3D Global MHD Modeling of Solar Subsurface Convection