What effect does ocean current have on climate?

Generally speaking, warm current will increase temperature and humidity, while cold current will decrease temperature and humidity. Influence on temperature Ocean current transfers heat from low latitude to high latitude, especially the contribution of warm current. The influence of ocean current on the temperature on both sides of the continent at the same latitude: the coastal temperature of the continent where warm current passes is high, and the coastal temperature of the continent where cold current passes is low. Influence on precipitation and fog: heat and water vapor are transported upward with warm current, which makes stratification unstable, air humidity increases, and precipitation is easy to occur. The cold current produces inversion, stratification is stable, water vapor is not easy to be transported upward, evaporation is weak, and the relative humidity of the lower layer is sometimes very high, but it can only become fog, not rain. The cold front is mostly advection fog, which appears in the following situations: sea and land wind fog: during the day, the land wind flows to the cold front to form advection fog; Sea fog: At the intersection of cold and warm air, the wind blows from the surface of warm current to the surface of cold current, forming advection fog.