Why does the sea water flow?

Ocean currents are also called ocean currents. In addition to tidal movement caused by tidal force, seawater flows along a certain path on a large scale. The factors that cause ocean current movement can be wind or uneven distribution of seawater density caused by hot salt effect. The former shows wind stress acting on the sea surface, while the latter shows strong gradient force of horizontal pressure in seawater. Coupled with the geostrophic bias, seawater flows both horizontally and vertically. Among them, prevailing wind is the main driving force of wind and current. Due to the obstruction and friction between the coast and the seabed, the current performance near the coast and the seabed is very different from that in the open ocean.

Ocean current is the main regulator of the thermal environment on the earth's surface. Ocean currents can be divided into warm currents and cold currents. If the water temperature of ocean current is higher than the water temperature reaching the sea area, it is called warm current; If the water temperature of the ocean current is lower than the water temperature reaching the sea area, it is called a cold current. Generally, the ocean current from low latitude to high latitude is warm current, and the ocean current from high latitude to low latitude is cold current. Sailing along ocean currents can save fuel and speed up. When cold and warm air currents meet, sea fog often forms, which is not conducive to maritime navigation. In addition, ocean currents carry icebergs south from the Arctic, posing a great threat to maritime shipping.

Ocean current, also known as ocean current, refers to the large-scale and relatively stable flow of surface seawater in a certain direction all the year round.

Ocean current is the main regulator of the thermal environment on the earth's surface, and the huge ocean current system promotes the energy exchange in high and low latitudes of the earth. The environmental characteristics between ocean currents and the areas they pass through are also changed through capacity exchange.