Schematic showing how stronger tidal mixing leads to global surface warming. The stronger tidal mixing enhances the oceanic MOC and thereby the meridional ocean heat transport. As a result, the polar sea ice coverage decreases, and the ice-albedo feedback warms the surface. The stronger ocean heat transport also decreases the meridional temperature gradient and weakens the atmospheric convergence and baroclinic instability of the atmosphere, and the cloud feedback further warms the surface. In addition, water vapor feedback also acts to warm the planetary surface.