# How much do ocean currents alone slow Earth's rotation?

Tidal friction is commonly spoken of as the reason for the slowing of Earth's rotation. What if the moon didn't exist? We would still have ocean currents and wind due to the Coriolis effect and the resulting friction certainly must be significant. Is it possible to quantify the contribution of each source of friction?

The rotational energy of the Earth is about $$2\times 10^{29}\,$$J, so a terawatt is tiny; moreover, that is dissipating wind energy, provided by the Sun continuously.