How do ocean currents cause foggy weather?

Fog has two essential conditions: one is the existence of hygroscopic condensation nuclei, and the other is that the water vapor content of the air reaches saturation or even supersaturation.

So generally speaking, the analysis of fog is not directly related to ocean currents. However, the observation shows that the land-sea junction area with large horizontal temperature gradient and the water area where cold and warm ocean currents meet are the places where advection fog occurs most, and advection fog mostly appears on the surface of Leng Hai where cold and warm ocean currents meet.