Cold current and warm current: ocean currents can be divided into warm current and cold current according to their nature. Any ocean current whose seawater temperature is higher than the flowing sea area it passes through is called warm current, and generally the ocean current flowing from low latitude to high latitude belongs to warm current. The sea areas and coastal areas where warm current flows are generally warmer, wetter and more abundant in rainfall than other sea areas at the same latitude, which is beneficial to agricultural production. Any flowing ocean current whose seawater temperature is lower than that of the sea area it passes through is called a cold current. Generally, the current flowing from high latitude to low latitude belongs to cold current. The cold current will reduce the temperature and precipitation flowing through the sea and coastal areas. The east-west current generally belongs to warm current. Only in west wind drift in the southern hemisphere, due to the influence of the Antarctic continent and sea ice floes, the seawater temperature is low, which belongs to the cold current.