Conclusion
	" Convection is THE important transport mechanism in geophysical systems " for moderate heat differences systems exhibit a stationary flow " depending on the magnitude of the Prandtl number the flows are becoming time-dependent " for low-Pr. flow the velocity fields have a strong toroidal component " effect like volumetric heating break the symmetry between up- and down-wellings " most geophysical flows are in a regime where the flows are chaotic