Final answer:
Coastal upwelling does not drive ocean gyres; gyres are formed by global wind patterns, the Coriolis effect, and the unequal heating of the Earth's surface.
Step-by-step explanation:
The factor that does NOT drive ocean gyres is coastal upwelling. Ocean gyres are large systems of circular ocean currents formed by global wind patterns and forces created by Earth's rotation, known as the Coriolis effect, and the unequal heating of the Earth's surface.
The atmospheric convection currents, also a product of unequal heating, contribute to the formation of gyres by setting in motion the flow of water in the oceans. However, coastal upwelling, which is the rising of water from deeper layers of the ocean to the surface along coastlines, is a separate process that does not contribute to the creation of gyres but rather is a result of wind patterns along the coast.